PUR\/Polyurethane vs 5GM3 Rubber: Sheath Material Comparison for Hard-Rock Mining | Feichun Cables<\/title>\n <style>\n * {\n margin: 0;\n padding: 0;\n box-sizing: border-box;\n }\n\n body {\n font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, \"Helvetica Neue\", Arial, sans-serif;\n line-height: 1.8;\n max-width: 100%;\n padding: 20px;\n }\n\n @media (min-width: 768px) {\n body {\n padding: 40px 60px;\n }\n }\n\n header {\n padding-bottom: 30px;\n margin-bottom: 40px;\n border-bottom: 2px solid;\n }\n\n h1 {\n font-size: 2em;\n margin-bottom: 15px;\n font-weight: 700;\n }\n\n h2 {\n font-size: 1.5em;\n margin-top: 40px;\n margin-bottom: 20px;\n font-weight: 600;\n }\n\n h3 {\n font-size: 1.2em;\n margin-top: 30px;\n margin-bottom: 15px;\n font-weight: 600;\n }\n\n p {\n margin-bottom: 20px;\n }\n\n .bilingual {\n font-size: 0.9em;\n opacity: 0.85;\n margin-left: 10px;\n }\n\n table {\n width: 100%;\n border-collapse: collapse;\n margin: 30px 0;\n font-size: 0.95em;\n }\n\n th, td {\n padding: 12px 15px;\n text-align: left;\n border: 1px solid;\n }\n\n th {\n font-weight: 600;\n }\n\n tbody tr:nth-child(even) {\n opacity: 0.95;\n }\n\n .company-info {\n margin-top: 50px;\n padding: 25px;\n border-radius: 8px;\n border: 1px solid;\n }\n\n .contact-info {\n margin-top: 15px;\n }\n\n .contact-info a {\n display: inline-block;\n margin-right: 20px;\n margin-bottom: 10px;\n text-decoration: none;\n }\n\n .reference {\n font-size: 0.85em;\n margin-top: 5px;\n opacity: 0.8;\n }\n\n .spec-list {\n margin: 20px 0 20px 25px;\n }\n\n .spec-list li {\n margin-bottom: 10px;\n }\n\n sup {\n font-size: 0.75em;\n }\n\n footer {\n margin-top: 60px;\n padding-top: 30px;\n border-top: 1px solid;\n font-size: 0.9em;\n opacity: 0.8;\n }\n\n .highlight-box {\n margin: 25px 0;\n padding: 20px;\n border-radius: 6px;\n border: 2px solid;\n }\n\n .comparison-summary {\n margin: 25px 0;\n padding: 20px;\n border-radius: 6px;\n border: 1px solid;\n }\n\n \/* Light\/Dark mode compatibility *\/\n @media (prefers-color-scheme: light) {\n body {\n background-color: #ffffff;\n color: #1a1a1a;\n }\n header {\n border-bottom-color: #d0d0d0;\n }\n th, td {\n border-color: #d0d0d0;\n }\n .company-info, .comparison-summary {\n background-color: #f8f8f8;\n border-color: #d0d0d0;\n }\n .highlight-box {\n background-color: #f0f8ff;\n border-color: #4a90e2;\n }\n footer {\n border-top-color: #d0d0d0;\n }\n a {\n color: #0066cc;\n }\n a:hover {\n color: #0052a3;\n }\n }\n\n @media (prefers-color-scheme: dark) {\n body {\n background-color: #1a1a1a;\n color: #e0e0e0;\n }\n header {\n border-bottom-color: #404040;\n }\n th, td {\n border-color: #404040;\n }\n tbody tr:nth-child(even) {\n background-color: rgba(255, 255, 255, 0.03);\n }\n .company-info, .comparison-summary {\n background-color: #242424;\n border-color: #404040;\n }\n .highlight-box {\n background-color: #1a2836;\n border-color: #3a6a9e;\n }\n footer {\n border-top-color: #404040;\n }\n a {\n color: #4d9fff;\n }\n a:hover {\n color: #6bb3ff;\n }\n }\n <\/style>\n<\/head>\n<body>\n <header>\n <h1>PUR\/Polyurethane Sheath vs 5GM3 Rubber: Material Comparison for Abrasive Hard-Rock Mining<\/h1>\n <p><strong>Is (N)12Y Polyurethane Sheath Better Than 5GM3 Rubber for Hard-Rock Mining Operations?<\/strong> <span class=\"bilingual\">\u805a\u6c28\u916f\u62a4\u5957\u662f\u5426\u4f18\u4e8e5GM3\u6a61\u80f6\u7528\u4e8e\u786c\u5ca9\u91c7\u77ff\u4f5c\u4e1a\uff1f<\/span><\/p>\n <p><em>Anhui Feichun Special Cable Co., Ltd.<\/em> <span class=\"bilingual\">\u5b89\u5fbd\u98de\u7eaf\u7279\u79cd\u7535\u7f06\u6709\u9650\u516c\u53f8<\/span><\/p>\n <\/header>\n\n <main>\n <section>\n <h2>1. Understanding the Material Challenge in Hard-Rock Mining <span class=\"bilingual\">\u4e86\u89e3\u786c\u5ca9\u91c7\u77ff\u4e2d\u7684\u6750\u6599\u6311\u6218<\/span><\/h2>\n \n <p>Hard-rock mining operations present some of the most severe mechanical challenges for cable materials in any industrial environment. Unlike coal mining where the surrounding geology consists of relatively softer sedimentary rock formations, hard-rock mining for metals such as gold, copper, platinum, iron ore, and other valuable minerals involves working with extremely abrasive geological materials. Granite, basalt, quartzite, and metamorphic rocks create an environment where cables are constantly subjected to cutting, gouging, and grinding forces that can rapidly destroy inadequately protected cable sheaths.<sup>1<\/sup><\/p>\n \n <p class=\"bilingual\">\u786c\u5ca9\u91c7\u77ff\u4f5c\u4e1a\u5bf9\u7535\u7f06\u6750\u6599\u5728\u4efb\u4f55\u5de5\u4e1a\u73af\u5883\u4e2d\u90fd\u63d0\u51fa\u4e86\u4e00\u4e9b\u6700\u4e25\u5cfb\u7684\u673a\u68b0\u6311\u6218\u3002\u4e0e\u7164\u77ff\u5f00\u91c7\u5468\u56f4\u5730\u8d28\u7531\u76f8\u5bf9\u8f83\u8f6f\u7684\u6c89\u79ef\u5ca9\u5c42\u7ec4\u6210\u4e0d\u540c\uff0c\u5f00\u91c7\u91d1\u3001\u94dc\u3001\u94c2\u3001\u94c1\u77ff\u77f3\u548c\u5176\u4ed6\u8d35\u91cd\u77ff\u7269\u7684\u786c\u5ca9\u91c7\u77ff\u6d89\u53ca\u4e0e\u6781\u5177\u78e8\u8680\u6027\u7684\u5730\u8d28\u6750\u6599\u4e00\u8d77\u5de5\u4f5c\u3002<\/p>\n\n <p>Cable sheaths in hard-rock mining environments must simultaneously resist multiple forms of mechanical damage while maintaining flexibility for installation and operation. The dominant failure mechanism in these applications is abrasive wear, where sharp mineral particles and rough rock surfaces progressively remove material from the cable surface through repeated contact and dragging action. However, cables must also withstand impact from falling rock fragments, crushing forces from mobile equipment, and the tensile stresses associated with cable reeling and unreeling operations on drag lines, shovels, continuous miners, and other heavy machinery.<sup>2<\/sup><\/p>\n\n <p>The two dominant sheath materials used in hard-rock mining applications represent fundamentally different material families with distinct performance characteristics. Polyurethane, specifically formulated compounds meeting or exceeding the (N)12Y designation, belongs to the thermoplastic elastomer family and offers exceptional resistance to abrasive wear through its unique molecular structure. The 5GM3 designation refers to a specific class of synthetic thermosetting rubber compound defined by German standard DIN VDE 0207 Part 21, which has been the traditional workhorse material for mining cable sheaths for decades due to its excellent balance of mechanical properties, chemical resistance, and proven reliability.<sup>3<\/sup><\/p>\n\n <div class=\"highlight-box\">\n <h3>The Real Question: Performance Trade-Offs vs. Application Requirements <span class=\"bilingual\">\u771f\u6b63\u7684\u95ee\u9898\uff1a\u6027\u80fd\u6743\u8861\u4e0e\u5e94\u7528\u8981\u6c42<\/span><\/h3>\n <p>The question of whether polyurethane is “better” than 5GM3 rubber cannot be answered with a simple yes or no, because the optimal choice depends entirely on the specific operating conditions, equipment types, and performance priorities for each mining application. Rather than declaring one material universally superior, mining engineers must understand the specific strengths and limitations of each material family to make informed decisions that balance abrasion resistance, flexibility, temperature performance, chemical compatibility, cost, and service life for their particular operating environment.<\/p>\n <\/div>\n\n <p class=\"reference\">[1] TPC Wire & Cable. (2025). Avoiding MSHA Citations: Choosing the Right Wire and Cable in Mining. Retrieved from <a href=\"https:\/\/www.tpcwire.com\/blog\/avoiding-msha-citations-choosing-the-right-wire-and-cable-in-mining\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.tpcwire.com\/blog\/avoiding-msha-citations<\/a><\/p>\n\n <p class=\"reference\">[2] Amplexmining Australia. (2025). Cable Selection in Mining Operations: A Comprehensive Guide. Retrieved from <a href=\"https:\/\/www.amplexmining.com.au\/cable-selection-in-mining-operations-a-comprehensive-guide\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.amplexmining.com.au\/cable-selection-mining-operations<\/a><\/p>\n\n <p class=\"reference\">[3] Power and Cables. (2017). Mining Cables Catalogue. Retrieved from <a href=\"https:\/\/www.powerandcables.com\/wp-content\/uploads\/2017\/07\/Mining-Cables-T-F-Kable-Catalogue.pdf\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.powerandcables.com\/mining-cables-catalogue<\/a><\/p>\n <\/section>\n\n <section>\n <h2>2. Polyurethane (PUR) Material Properties and Performance <span class=\"bilingual\">\u805a\u6c28\u916f\uff08PUR\uff09\u6750\u6599\u7279\u6027\u548c\u6027\u80fd<\/span><\/h2>\n\n <p>Polyurethane, commonly abbreviated as PUR or sometimes PU, is a thermoplastic elastomer material that has gained widespread adoption in harsh-environment cable applications since its introduction to cable manufacturing in the nineteen-sixties. The term thermoplastic means that polyurethane can be repeatedly softened by heating and solidified by cooling without undergoing irreversible chemical changes, which makes it recyclable unlike thermosetting rubber materials. This characteristic, combined with superior physical properties compared to traditional thermosetting rubbers, has driven the increasing use of polyurethane in demanding mining applications.<sup>4<\/sup><\/p>\n\n <p class=\"bilingual\">\u805a\u6c28\u916f\uff0c\u901a\u5e38\u7f29\u5199\u4e3aPUR\u6216\u6709\u65f6PU\uff0c\u662f\u4e00\u79cd\u70ed\u5851\u6027\u5f39\u6027\u4f53\u6750\u6599\uff0c\u81ea\u4e8c\u5341\u4e16\u7eaa\u516d\u5341\u5e74\u4ee3\u5f15\u5165\u7535\u7f06\u5236\u9020\u4ee5\u6765\uff0c\u5df2\u5728\u6076\u52a3\u73af\u5883\u7535\u7f06\u5e94\u7528\u4e2d\u83b7\u5f97\u5e7f\u6cdb\u91c7\u7528\u3002\u70ed\u5851\u6027\u8fd9\u4e2a\u672f\u8bed\u610f\u5473\u7740\u805a\u6c28\u916f\u53ef\u4ee5\u901a\u8fc7\u52a0\u70ed\u91cd\u590d\u8f6f\u5316\u5e76\u901a\u8fc7\u51b7\u5374\u56fa\u5316\uff0c\u800c\u4e0d\u4f1a\u53d1\u751f\u4e0d\u53ef\u9006\u7684\u5316\u5b66\u53d8\u5316\uff0c\u8fd9\u4f7f\u5176\u53ef\u56de\u6536\uff0c\u4e0d\u50cf\u70ed\u56fa\u6027\u6a61\u80f6\u6750\u6599\u3002<\/p>\n\n <h3>2.1 Molecular Structure and Abrasion Resistance <span class=\"bilingual\">\u5206\u5b50\u7ed3\u6784\u548c\u8010\u78e8\u6027<\/span><\/h3>\n\n <p>The exceptional abrasion resistance of polyurethane sheaths derives from the material’s molecular architecture. Polyurethane polymers consist of alternating hard and soft segments in their molecular chains, creating a microphase-separated structure where rigid urethane linkages provide mechanical strength while flexible polyether or polyester chains contribute elasticity and toughness. This segmented block copolymer structure gives polyurethane unique properties that are difficult to achieve with conventional rubber formulations.<sup>5<\/sup><\/p>\n\n <p>When subjected to abrasive wear, the hard segments in polyurethane provide resistance to cutting and gouging while the soft segments allow the material to deform elastically under load, distributing stresses over a larger area rather than concentrating damage at specific points. Research on polyurethane abrasion mechanisms has demonstrated that high-quality polyurethane compounds can exhibit abrasion resistance five to ten times greater than conventional rubber materials in standardized testing, though actual performance advantages in field applications depend on the specific test conditions and comparison materials used.<sup>6<\/sup><\/p>\n\n <p>For cable applications, polyurethane formulations are typically based on polyether rather than polyester chemistry because polyether-based materials offer superior resistance to hydrolysis (chemical degradation in the presence of moisture). This distinction is particularly important in underground mining environments where cables may be exposed to standing water, high humidity, or direct water spray from dust suppression systems. Polyester-based polyurethanes, while offering some advantages in dry environments, can undergo chemical breakdown when exposed to prolonged contact with water, leading to loss of mechanical strength and eventual sheath failure.<sup>7<\/sup><\/p>\n\n <table>\n <caption><strong>Table 1: Key Mechanical Properties of Polyurethane Cable Sheaths<\/strong> <span class=\"bilingual\">\u805a\u6c28\u916f\u7535\u7f06\u62a4\u5957\u7684\u5173\u952e\u673a\u68b0\u6027\u80fd<\/span><\/caption>\n <thead>\n <tr>\n <th>Property <span class=\"bilingual\">\u6027\u80fd<\/span><\/th>\n <th>Typical Value Range <span class=\"bilingual\">\u5178\u578b\u503c\u8303\u56f4<\/span><\/th>\n <th>Significance for Mining <span class=\"bilingual\">\u5bf9\u91c7\u77ff\u7684\u610f\u4e49<\/span><\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td>Tensile Strength<\/td>\n <td>35-60 MPa (N\/mm\u00b2)<\/td>\n <td>Resists tearing under tension during cable pulling and equipment movement<\/td>\n <\/tr>\n <tr>\n <td>Elongation at Break<\/td>\n <td>400-600%<\/td>\n <td>Allows flexibility and prevents brittle fracture under stress<\/td>\n <\/tr>\n <tr>\n <td>Tear Resistance<\/td>\n <td>80-150 kN\/m<\/td>\n <td>Prevents propagation of damage when sheath is cut or nicked<\/td>\n <\/tr>\n <tr>\n <td>Abrasion Resistance (DIN 53516)<\/td>\n <td>15-35 mm\u00b3 volume loss<\/td>\n <td>Directly correlates to sheath life in abrasive environments<\/td>\n <\/tr>\n <tr>\n <td>Hardness (Shore A)<\/td>\n <td>85-95<\/td>\n <td>Balance between cutting resistance and flexibility<\/td>\n <\/tr>\n <tr>\n <td>Notch Resistance<\/td>\n <td>Excellent (qualitative)<\/td>\n <td>Critical for preventing catastrophic sheath failure from cuts<\/td>\n <\/tr>\n <tr>\n <td>Operating Temperature<\/td>\n <td>-40\u00b0C to +90\u00b0C (continuous)<\/td>\n <td>Maintains flexibility across mining temperature extremes<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n\n <p class=\"reference\">[4] Eland Cables. (2025). FAQ: The Benefits of PUR Cables. Retrieved from <a href=\"https:\/\/www.elandcables.com\/the-cable-lab\/faqs\/faq-what-are-the-benefits-of-pur-cables\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.elandcables.com\/benefits-of-pur-cables<\/a><\/p>\n\n <p class=\"reference\">[5] MISUMI USA. (2025). Cable Jacket Material Guide: PVC vs PUR vs TPE. Retrieved from <a href=\"https:\/\/us.misumi-ec.com\/blog\/cable-jacket-material\/\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/us.misumi-ec.com\/blog\/cable-jacket-material<\/a><\/p>\n\n <p class=\"reference\">[6] Ruitiancables. (2025). Oil Resistant Highly Flexible PUR Polyurethane Cable. Retrieved from <a href=\"https:\/\/www.ruitiancables.com\/products\/pur-cable.html\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.ruitiancables.com\/products\/pur-cable<\/a><\/p>\n\n <p class=\"reference\">[7] SAB Cable. (2025). PUR Cables & Wires (TPE-U): Features, Advantages & Applications. Retrieved from <a href=\"https:\/\/www.sab-cable.com\/cables-wires-harnessing-temperature-measurement\/technical-data\/cables-and-wires\/polyurethane-pur.html\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.sab-cable.com\/polyurethane-pur-technical-data<\/a><\/p>\n\n <h3>2.2 Chemical and Environmental Resistance <span class=\"bilingual\">\u5316\u5b66\u548c\u73af\u5883\u6297\u6027<\/span><\/h3>\n\n <p>Beyond mechanical properties, polyurethane cable sheaths offer excellent resistance to oils, hydraulic fluids, greases, and many industrial chemicals commonly encountered in mining operations. This chemical resistance stems from the polymer’s chemical inertness to non-polar hydrocarbon compounds, making PUR cables particularly suitable for applications where exposure to diesel fuel, lubricating oils, cutting fluids, and hydraulic oils is unavoidable. In hard-rock mining operations employing hydraulically-powered drilling equipment, excavators, and material handling machinery, the ability to withstand repeated oil exposure without swelling or degradation represents a significant practical advantage.<sup>8<\/sup><\/p>\n\n <p>Polyurethane also demonstrates superior resistance to ozone, ultraviolet radiation, and weathering compared to many rubber compounds. In surface mining operations where cables may be exposed to direct sunlight, polyurethane maintains its mechanical properties with minimal degradation, though some discoloration or yellowing of the surface may occur over time. This surface discoloration, while aesthetically undesirable, does not typically affect the functional performance of the cable sheath. The addition of UV stabilizers and dark-colored pigments, particularly carbon black in black-jacketed cables, significantly improves UV resistance and reduces visible degradation effects.<sup>9<\/sup><\/p>\n\n <p class=\"bilingual\">\u805a\u6c28\u916f\u8fd8\u8868\u73b0\u51fa\u6bd4\u8bb8\u591a\u6a61\u80f6\u5316\u5408\u7269\u66f4\u4f18\u8d8a\u7684\u8010\u81ed\u6c27\u3001\u7d2b\u5916\u7ebf\u8f90\u5c04\u548c\u8010\u5019\u6027\u3002\u5728\u8868\u9762\u91c7\u77ff\u4f5c\u4e1a\u4e2d\uff0c\u7535\u7f06\u53ef\u80fd\u66b4\u9732\u4e8e\u76f4\u5c04\u9633\u5149\u4e0b\uff0c\u805a\u6c28\u916f\u4ee5\u6700\u5c0f\u7684\u964d\u89e3\u4fdd\u6301\u5176\u673a\u68b0\u6027\u80fd\uff0c\u5c3d\u7ba1\u968f\u7740\u65f6\u95f4\u7684\u63a8\u79fb\u53ef\u80fd\u4f1a\u53d1\u751f\u4e00\u4e9b\u8868\u9762\u53d8\u8272\u6216\u53d1\u9ec4\u3002<\/p>\n\n <p>Temperature performance represents one area where polyurethane requires careful consideration. Standard polyurethane formulations maintain excellent flexibility and mechanical properties across a wide temperature range, typically from negative forty degrees Celsius to positive ninety degrees Celsius for continuous operation, with short-term exposure capability extending to one hundred twenty-five degrees Celsius or higher depending on formulation. At very low temperatures below negative twenty-five degrees Celsius, some polyurethane compounds may exhibit increased stiffness, though specialized cold-temperature formulations can extend the lower operating limit to negative forty degrees Celsius or below. At elevated temperatures approaching the upper operating limit, polyurethane becomes progressively more rubber-like in behavior, which can increase friction and abrasion within cable reels or trays compared to the material’s behavior at moderate temperatures.<sup>10<\/sup><\/p>\n\n <p class=\"reference\">[8] Angreen. (2025). Durable PUR Cable Material for Harsh Environments. Retrieved from <a href=\"https:\/\/www.angreen.com\/news\/pur-cable-material.html\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.angreen.com\/news\/pur-cable-material<\/a><\/p>\n\n <p class=\"reference\">[9] SAB Cable. (2025). PUR Cables & Wires (TPE-U): Features, Advantages & Applications. Retrieved from <a href=\"https:\/\/www.sab-cable.com\/cables-wires-harnessing-temperature-measurement\/technical-data\/cables-and-wires\/polyurethane-pur.html\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.sab-cable.com\/polyurethane-pur-technical-data<\/a><\/p>\n\n <p class=\"reference\">[10] LAPP Group. (2025). Connecting Cable and Control Cable: Cables for Harsh Conditions. Retrieved from <a href=\"https:\/\/lapplimited.lappgroup.com\/products\/polyurethane-high-tough-cables.html\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/lapplimited.lappgroup.com\/polyurethane-high-tough-cables<\/a><\/p>\n <\/section>\n\n <section>\n <h2>3. 5GM3 Rubber Compound: The Traditional Mining Standard <span class=\"bilingual\">5GM3\u6a61\u80f6\u5316\u5408\u7269\uff1a\u4f20\u7edf\u91c7\u77ff\u6807\u51c6<\/span><\/h2>\n\n <p>The designation 5GM3 refers to a specific classification of synthetic thermosetting rubber compound established by German standard DIN VDE 0207 Part 21. This specification defines minimum performance requirements for elastomeric cable sheathing materials intended for heavy-duty industrial applications, with particular emphasis on properties relevant to mining, quarrying, and outdoor industrial installations. Understanding that 5GM3 represents a specification rather than a single formulation is important\u2014different cable manufacturers may produce 5GM3-compliant compounds with varying performance characteristics while still meeting the minimum standard requirements.<sup>11<\/sup><\/p>\n\n <p class=\"bilingual\">5GM3\u7684\u540d\u79f0\u6307\u7684\u662f\u5fb7\u56fd\u6807\u51c6DIN VDE 0207\u7b2c21\u90e8\u5206\u5efa\u7acb\u7684\u5408\u6210\u70ed\u56fa\u6027\u6a61\u80f6\u5316\u5408\u7269\u7684\u7279\u5b9a\u5206\u7c7b\u3002\u8be5\u89c4\u8303\u5b9a\u4e49\u4e86\u7528\u4e8e\u91cd\u578b\u5de5\u4e1a\u5e94\u7528\u7684\u5f39\u6027\u7535\u7f06\u62a4\u5957\u6750\u6599\u7684\u6700\u4f4e\u6027\u80fd\u8981\u6c42\uff0c\u7279\u522b\u5f3a\u8c03\u4e0e\u91c7\u77ff\u3001\u91c7\u77f3\u548c\u6237\u5916\u5de5\u4e1a\u5b89\u88c5\u76f8\u5173\u7684\u6027\u80fd\u3002<\/p>\n\n <h3>3.1 Material Composition and Thermosetting Characteristics <span class=\"bilingual\">\u6750\u6599\u7ec4\u6210\u548c\u70ed\u56fa\u6027\u7279\u5f81<\/span><\/h3>\n\n <p>Compounds meeting the 5GM3 specification are typically based on synthetic rubber polymers such as styrene-butadiene rubber, chloroprene rubber (also known by the trade name Neoprene or abbreviated as CR or PCP), or ethylene propylene rubber (EPR). These base polymers are combined with fillers, vulcanizing agents, processing aids, and protective additives to create a compound that, when subjected to heat and pressure during the cable manufacturing process, undergoes irreversible chemical cross-linking known as vulcanization or curing. This cross-linking creates a three-dimensional network structure that gives the cured rubber its elastic properties and prevents the material from softening or flowing when subsequently heated.<sup>12<\/sup><\/p>\n\n <p>The thermosetting nature of 5GM3 rubber provides certain advantages in cable applications. Unlike thermoplastic materials such as polyurethane, which can soften and deform under sustained load at elevated temperatures, cured rubber compounds maintain dimensional stability across their operating temperature range. This characteristic prevents problems such as cold flow, where prolonged mechanical pressure on a thermoplastic sheath can cause permanent indentation or deformation that compromises cable geometry. In mining cable reels where cables are wound under tension for extended periods, the dimensional stability of thermosetting rubber helps prevent the sheath from being squeezed or deformed by adjacent cable wraps.<sup>13<\/sup><\/p>\n\n <h3>3.2 Performance Requirements per DIN VDE 0207 Part 21 <span class=\"bilingual\">\u6839\u636eDIN VDE 0207\u7b2c21\u90e8\u5206\u7684\u6027\u80fd\u8981\u6c42<\/span><\/h3>\n\n <p>The DIN VDE 0207 Part 21 standard establishes specific performance criteria that materials must meet to earn the 5GM3 designation. These requirements address the key failure mechanisms and operating conditions encountered in heavy industrial applications. The standard specifies minimum tensile strength, elongation at break, resistance to tearing, hardness limits, and behavior under thermal aging conditions. Materials must demonstrate adequate resistance to oils, greases, and common industrial chemicals, though the specific test methods and acceptance criteria differ from those used to evaluate polyurethane materials.<sup>14<\/sup><\/p>\n\n <p>Temperature performance specifications for 5GM3 compounds typically define an operating range from negative twenty-five degrees Celsius to positive ninety degrees Celsius for mobile installations, with the lower limit extended to negative forty degrees Celsius for fixed installations where flexibility requirements are less stringent. Within this temperature window, 5GM3 rubber maintains good flexibility and mechanical properties, though the material generally exhibits somewhat reduced flexibility at the coldest temperatures compared to polyurethane, and may show slightly reduced mechanical strength at the highest operating temperatures.<sup>15<\/sup><\/p>\n\n <table>\n <caption><strong>Table 2: DIN VDE 0207 Part 21 Requirements for 5GM3 Rubber Compounds<\/strong> <span class=\"bilingual\">5GM3\u6a61\u80f6\u5316\u5408\u7269\u7684DIN VDE 0207\u7b2c21\u90e8\u5206\u8981\u6c42<\/span><\/caption>\n <thead>\n <tr>\n <th>Property <span class=\"bilingual\">\u6027\u80fd<\/span><\/th>\n <th>Minimum Requirement <span class=\"bilingual\">\u6700\u4f4e\u8981\u6c42<\/span><\/th>\n <th>Test Method <span class=\"bilingual\">\u6d4b\u8bd5\u65b9\u6cd5<\/span><\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td>Tensile Strength<\/td>\n <td>\u226510 N\/mm\u00b2 (MPa)<\/td>\n <td>DIN VDE 0207 Part 21<\/td>\n <\/tr>\n <tr>\n <td>Elongation at Break<\/td>\n <td>\u2265250%<\/td>\n <td>DIN VDE 0207 Part 21<\/td>\n <\/tr>\n <tr>\n <td>Tear Propagation Resistance<\/td>\n <td>\u226515 N\/mm (notched specimen)<\/td>\n <td>DIN VDE 0207 Part 21<\/td>\n <\/tr>\n <tr>\n <td>Temperature Range (Mobile)<\/td>\n <td>-25\u00b0C to +90\u00b0C<\/td>\n <td>Specified by standard<\/td>\n <\/tr>\n <tr>\n <td>Temperature Range (Fixed)<\/td>\n <td>-40\u00b0C to +80\u00b0C<\/td>\n <td>Specified by standard<\/td>\n <\/tr>\n <tr>\n <td>Oil Resistance<\/td>\n <td>Limited volume change after immersion<\/td>\n <td>Oil aging test per standard<\/td>\n <\/tr>\n <tr>\n <td>Ozone Resistance<\/td>\n <td>No cracking under specified conditions<\/td>\n <td>Ozone exposure test<\/td>\n <\/tr>\n <tr>\n <td>Flame Resistance<\/td>\n <td>Self-extinguishing<\/td>\n <td>Flame test per standard<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n\n <p class=\"reference\">[11] Power and Cables. (2017). Mining Cables Catalogue. Retrieved from <a href=\"https:\/\/www.powerandcables.com\/wp-content\/uploads\/2017\/07\/Mining-Cables-T-F-Kable-Catalogue.pdf\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.powerandcables.com\/mining-cables-catalogue<\/a><\/p>\n\n <p class=\"reference\">[12] Huadong Cables. (2025). Flexible Rubber Sheathed Soft Cable for Coal Mining Machine. Retrieved from <a href=\"https:\/\/hdc-cables.com\/mining-cable\/\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/hdc-cables.com\/mining-cable<\/a><\/p>\n\n <p class=\"reference\">[13] Power and Cables. (2017). Mining Cables Catalogue. Retrieved from <a href=\"https:\/\/www.powerandcables.com\/wp-content\/uploads\/2017\/07\/Mining-Cables-T-F-Kable-Catalogue.pdf\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.powerandcables.com\/mining-cables-catalogue<\/a><\/p>\n\n <p class=\"reference\">[14] Power and Cables. (2017). Mining Cables Catalogue. Retrieved from <a href=\"https:\/\/www.powerandcables.com\/wp-content\/uploads\/2017\/07\/Mining-Cables-T-F-Kable-Catalogue.pdf\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.powerandcables.com\/mining-cables-catalogue<\/a><\/p>\n\n <p class=\"reference\">[15] Power and Cables. (2017). Mining Cables Catalogue. Retrieved from <a href=\"https:\/\/www.powerandcables.com\/wp-content\/uploads\/2017\/07\/Mining-Cables-T-F-Kable-Catalogue.pdf\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.powerandcables.com\/mining-cables-catalogue<\/a><\/p>\n\n <h3>3.3 Proven Track Record in Mining Applications <span class=\"bilingual\">\u5728\u91c7\u77ff\u5e94\u7528\u4e2d\u7ecf\u8fc7\u9a8c\u8bc1\u7684\u8bb0\u5f55<\/span><\/h3>\n\n <p>One significant advantage of 5GM3 rubber compounds in mining applications stems from their decades-long proven performance history. Cables employing 5GM3 sheaths have been successfully used in underground coal mines, metal mines, quarries, and surface mining operations worldwide since the standard’s introduction. This extensive field experience has allowed engineers to develop detailed understanding of the material’s long-term aging behavior, failure modes, and service life expectations under various operating conditions. Mine operators and maintenance personnel are familiar with handling, installing, and maintaining rubber-sheathed cables, reducing training requirements and potential installation errors.<sup>16<\/sup><\/p>\n\n <p>The 5GM3 specification includes good resistance to ripping, notching, and abrasion, though typically not achieving the exceptional abrasion resistance levels demonstrated by high-quality polyurethane compounds. In practical mining applications, this difference means that 5GM3 rubber cables may require more frequent inspection and potentially shorter replacement intervals in the most severe abrasive environments, but they deliver reliable performance in many applications where abrasion, while present, is not the dominant failure mechanism. The specification also ensures good resistance to oils, greases, chemicals, and weather influences, making 5GM3 rubber suitable for the wide range of environmental conditions encountered across different mining operations.<sup>17<\/sup><\/p>\n\n <p class=\"reference\">[16] SSG Cable. (2020). Reliable Underground Mining Cable Manufacturer. Retrieved from <a href=\"https:\/\/www.ssgcable.com\/underground-mining-cable\/\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.ssgcable.com\/underground-mining-cable<\/a><\/p>\n\n <p class=\"reference\">[17] Power and Cables. (2017). Mining Cables Catalogue. Retrieved from <a href=\"https:\/\/www.powerandcables.com\/wp-content\/uploads\/2017\/07\/Mining-Cables-T-F-Kable-Catalogue.pdf\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.powerandcables.com\/mining-cables-catalogue<\/a><\/p>\n <\/section>\n\n <section>\n <h2>4. Direct Performance Comparison: PUR vs 5GM3 in Hard-Rock Mining <span class=\"bilingual\">\u76f4\u63a5\u6027\u80fd\u6bd4\u8f83\uff1a\u786c\u5ca9\u91c7\u77ff\u4e2d\u7684PUR\u4e0e5GM3<\/span><\/h2>\n\n <p>Understanding the theoretical properties of each material provides essential background, but the critical question for mining engineers centers on how these materials perform in actual hard-rock mining applications. A systematic comparison across the key performance dimensions relevant to mining operations reveals that each material offers distinct advantages and trade-offs that must be carefully considered based on specific application requirements.<\/p>\n\n <h3>4.1 Abrasion Resistance: The Primary Selection Criterion <span class=\"bilingual\">\u8010\u78e8\u6027\uff1a\u4e3b\u8981\u9009\u62e9\u6807\u51c6<\/span><\/h3>\n\n <p>In hard-rock mining environments where cables are dragged across rough mine floors, pulled over sharp rock edges, and subjected to constant contact with abrasive mineral particles, the sheath’s resistance to abrasive wear often becomes the dominant factor determining cable service life. Comparative testing of polyurethane and rubber materials using standardized abrasion tests such as DIN 53516 or Taber abrasion demonstrates that high-quality polyurethane formulations typically exhibit significantly superior abrasion resistance compared to standard 5GM3 rubber compounds.<sup>18<\/sup><\/p>\n\n <p class=\"bilingual\">\u5728\u786c\u5ca9\u91c7\u77ff\u73af\u5883\u4e2d\uff0c\u7535\u7f06\u88ab\u62d6\u8fc7\u7c97\u7cd9\u7684\u77ff\u4e95\u5730\u9762\uff0c\u62c9\u8fc7\u950b\u5229\u7684\u5ca9\u77f3\u8fb9\u7f18\uff0c\u5e76\u4e0d\u65ad\u4e0e\u78e8\u6599\u77ff\u7269\u9897\u7c92\u63a5\u89e6\uff0c\u62a4\u5957\u7684\u8010\u78e8\u6027\u901a\u5e38\u6210\u4e3a\u51b3\u5b9a\u7535\u7f06\u4f7f\u7528\u5bff\u547d\u7684\u4e3b\u8981\u56e0\u7d20\u3002<\/p>\n\n <p>Quantitative comparisons indicate that polyurethane can demonstrate two to five times greater abrasion resistance than rubber in controlled laboratory tests, depending on the specific formulations being compared and the test methodology employed. Field experience in hard-rock mining operations has generally confirmed this laboratory performance advantage, with operators reporting extended cable life when transitioning from rubber to polyurethane sheaths in applications involving severe abrasive conditions. For example, trailing cables on continuous miners, load-haul-dump vehicles, and mobile drilling equipment operating in granite or basalt formations have shown cable life improvements ranging from fifty percent to more than doubling when polyurethane sheaths replace traditional rubber construction.<sup>19<\/sup><\/p>\n\n <p>However, this abrasion resistance advantage must be evaluated in the context of the complete cable system and operating conditions. The superior abrasion resistance of polyurethane becomes most valuable in applications where abrasive wear represents the primary cable failure mechanism\u2014typically seen in dry, dusty mining environments with highly abrasive geology and frequent cable movement. In underground operations where cables experience less severe abrasion but must withstand impacts, crushing forces, or chemical exposure as the dominant stressors, the performance gap between materials may be less pronounced or even favor rubber in certain aspects.<sup>20<\/sup><\/p>\n\n <div class=\"comparison-summary\">\n <h3>Comparative Performance Summary: Abrasion Resistance <span class=\"bilingual\">\u8010\u78e8\u6027\u6bd4\u8f83\u6027\u80fd\u603b\u7ed3<\/span><\/h3>\n <p><strong>Polyurethane (PUR) Advantages:<\/strong><\/p>\n <ul class=\"spec-list\">\n <li>Exceptional abrasion resistance, typically 2-5x better than standard rubber in laboratory testing <span class=\"bilingual\">\u5353\u8d8a\u7684\u8010\u78e8\u6027\uff0c\u5728\u5b9e\u9a8c\u5ba4\u6d4b\u8bd5\u4e2d\u901a\u5e38\u6bd4\u6807\u51c6\u6a61\u80f6\u597d2-5\u500d<\/span><\/li>\n <li>Extended cable life in highly abrasive hard-rock mining environments <span class=\"bilingual\">\u5728\u9ad8\u78e8\u8680\u6027\u786c\u5ca9\u91c7\u77ff\u73af\u5883\u4e2d\u5ef6\u957f\u7535\u7f06\u5bff\u547d<\/span><\/li>\n <li>Particularly effective in dry, dusty conditions with sharp mineral particles <span class=\"bilingual\">\u5728\u6709\u5c16\u9510\u77ff\u7269\u9897\u7c92\u7684\u5e72\u71e5\u3001\u591a\u5c18\u6761\u4ef6\u4e0b\u7279\u522b\u6709\u6548<\/span><\/li>\n <li>Maintains surface integrity longer when dragged across rough surfaces <span class=\"bilingual\">\u5728\u7c97\u7cd9\u8868\u9762\u62d6\u52a8\u65f6\u4fdd\u6301\u8868\u9762\u5b8c\u6574\u6027\u66f4\u957f\u65f6\u95f4<\/span><\/li>\n <\/ul>\n <p><strong>5GM3 Rubber Advantages:<\/strong><\/p>\n <ul class=\"spec-list\">\n <li>Adequate abrasion resistance for many mining applications, proven through decades of field use <span class=\"bilingual\">\u5bf9\u8bb8\u591a\u91c7\u77ff\u5e94\u7528\u5177\u6709\u8db3\u591f\u7684\u8010\u78e8\u6027\uff0c\u7ecf\u8fc7\u6570\u5341\u5e74\u7684\u73b0\u573a\u4f7f\u7528\u9a8c\u8bc1<\/span><\/li>\n <li>More consistent performance across varying temperature and humidity conditions <span class=\"bilingual\">\u5728\u4e0d\u540c\u7684\u6e29\u5ea6\u548c\u6e7f\u5ea6\u6761\u4ef6\u4e0b\u6027\u80fd\u66f4\u4e00\u81f4<\/span><\/li>\n <li>Better balance of properties when abrasion is not the sole or dominant failure mode <span class=\"bilingual\">\u5f53\u78e8\u635f\u4e0d\u662f\u552f\u4e00\u6216\u4e3b\u8981\u5931\u6548\u6a21\u5f0f\u65f6\uff0c\u6027\u80fd\u5e73\u8861\u66f4\u597d<\/span><\/li>\n <\/ul>\n <\/div>\n\n <p class=\"reference\">[18] Ruitiancables. (2025). Oil Resistant Highly Flexible PUR Polyurethane Cable. Retrieved from <a href=\"https:\/\/www.ruitiancables.com\/products\/pur-cable.html\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.ruitiancables.com\/products\/pur-cable<\/a><\/p>\n\n <p class=\"reference\">[19] Eland Cables. (2025). FAQ: The Benefits of PUR Cables. Retrieved from <a href=\"https:\/\/www.elandcables.com\/the-cable-lab\/faqs\/faq-what-are-the-benefits-of-pur-cables\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.elandcables.com\/benefits-of-pur-cables<\/a><\/p>\n\n <p class=\"reference\">[20] Amplexmining Australia. (2025). Cable Guide for the Mining Industry: Types, Installation & Safety Tips. Retrieved from <a href=\"https:\/\/www.amplexmining.com.au\/cable-guide-for-the-mining-industry-types-installation-and-safety-tips\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.amplexmining.com.au\/cable-guide-mining-industry<\/a><\/p>\n\n <h3>4.2 Cut, Tear, and Notch Resistance <span class=\"bilingual\">\u6297\u5207\u5272\u3001\u6495\u88c2\u548c\u7f3a\u53e3\u6027<\/span><\/h3>\n\n <p>While abrasion resistance addresses gradual material removal through surface wear, cables in hard-rock mining also face the risk of sudden mechanical damage from sharp impacts, crushing events, and contact with jagged rock edges. The ability to resist cutting, tearing, and notch propagation represents a distinct performance dimension where material behavior differs significantly from pure abrasion resistance.<\/p>\n\n <p>Polyurethane sheaths exhibit exceptional notch resistance, meaning that small cuts or nicks in the surface do not readily propagate into larger tears or cracks under subsequent mechanical stress. This characteristic stems from the material’s high tear strength and elastic recovery properties, which distribute stresses around damaged areas rather than concentrating them at crack tips. In practice, this means that polyurethane-sheathed cables can often continue operating safely even after sustaining surface damage that might cause rapid failure in materials with poorer notch resistance. Mining operations report that visible surface scratches and minor gouges on polyurethane sheaths frequently do not progress to cable failure, allowing extended service life despite cosmetic damage.<sup>21<\/sup><\/p>\n\n <p>However, the very high hardness of polyurethane compounds, typically in the range of eighty-five to ninety-five Shore A durometer, creates a potential vulnerability to deep cutting damage. When subjected to severe concentrated loads from extremely sharp objects under high pressure, hard polyurethane may be more susceptible to complete penetration than softer rubber compounds that can deform elastically around the cutting edge. This characteristic becomes relevant in applications where cables may be compressed against sharp rock fragments by heavy equipment or pinched between moving machinery components.<sup>22<\/sup><\/p>\n\n <p>5GM3 rubber compounds, with typical hardness values in the seventy to eighty-five Shore A range, offer a different balance of properties. The somewhat softer material may be more resistant to complete penetration under concentrated loads, as the rubber can deform and conform around sharp objects rather than being cleanly cut. However, once damaged, rubber compounds generally exhibit less resistance to tear propagation, meaning that cuts and nicks are more likely to develop into larger tears over time when subjected to continued flexing and mechanical stress. This characteristic often manifests as the visible growth of existing damage during cable service, requiring more frequent cable inspection and potentially earlier replacement when damage exceeds acceptable limits.<sup>23<\/sup><\/p>\n\n <p class=\"reference\">[21] Ruitiancables. (2025). Oil Resistant Highly Flexible PUR Polyurethane Cable. Retrieved from <a href=\"https:\/\/www.ruitiancables.com\/products\/pur-cable.html\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.ruitiancables.com\/products\/pur-cable<\/a><\/p>\n\n <p class=\"reference\">[22] MISUMI USA. (2025). Cable Jacket Material Guide: PVC vs PUR vs TPE. Retrieved from <a href=\"https:\/\/us.misumi-ec.com\/blog\/cable-jacket-material\/\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/us.misumi-ec.com\/blog\/cable-jacket-material<\/a><\/p>\n\n <p class=\"reference\">[23] SWA Cable. (2025). Boost Your Mine with the Right Mining Cables. Retrieved from <a href=\"https:\/\/www.swacable.com\/boost-your-mine-with-the-right-mining-cables\/\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.swacable.com\/boost-your-mine-with-right-mining-cables<\/a><\/p>\n\n <h3>4.3 Flexibility and Cold Temperature Performance <span class=\"bilingual\">\u67d4\u97e7\u6027\u548c\u4f4e\u6e29\u6027\u80fd<\/span><\/h3>\n\n <p>Cable flexibility directly impacts installation ease, minimum bend radius requirements, and the cable’s ability to withstand repeated flexing in dynamic applications such as cable reels and drag chains. Both polyurethane and 5GM3 rubber can be formulated to provide good flexibility, but their behavior differs somewhat across the temperature range.<\/p>\n\n <p>At moderate temperatures between zero and forty degrees Celsius, both materials provide similar flexibility for properly formulated cable constructions, allowing installation around bends and routing through confined spaces typical of mining infrastructure. High-quality polyurethane maintains excellent flexibility across a broad temperature range, typically from negative forty degrees Celsius to positive ninety degrees Celsius, making it well-suited to mining operations that experience significant temperature variation between seasons or between surface and underground environments.<sup>24<\/sup><\/p>\n\n <p>At the cold end of the operating range, particularly below negative twenty degrees Celsius, some differences emerge. Polyurethane generally maintains better low-temperature flexibility than standard rubber compounds, remaining pliable and elastic at temperatures where rubber begins to stiffen. This advantage proves particularly valuable in surface mining operations in cold climates, where cables may need to be moved or coiled during winter conditions. However, for underground mining where ambient temperatures typically remain relatively constant and moderate regardless of surface weather, this cold-temperature advantage provides less practical benefit.<sup>25<\/sup><\/p>\n\n <p>One notable consideration regarding polyurethane flexibility involves its behavior at elevated temperatures. As mentioned previously, polyurethane becomes progressively more rubber-like as temperature increases toward its upper operating limit. This thermal softening can increase friction between cable wraps on reels and may affect handling characteristics during installation in hot conditions. For mining operations in tropical climates or where cables are exposed to direct sunlight heating, this characteristic warrants consideration, though it rarely creates operational problems when cables are properly specified for the application temperature range.<sup>26<\/sup><\/p>\n\n <p class=\"reference\">[24] Eland Cables. (2025). FAQ: The Benefits of PUR Cables. Retrieved from <a href=\"https:\/\/www.elandcables.com\/the-cable-lab\/faqs\/faq-what-are-the-benefits-of-pur-cables\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.elandcables.com\/benefits-of-pur-cables<\/a><\/p>\n\n <p class=\"reference\">[25] Eland Cables. (2025). PUR Cables: Polyurethane Cables. Retrieved from <a href=\"https:\/\/www.elandcables.com\/electrical-cable-and-accessories\/cables-by-type\/pur-cable\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.elandcables.com\/pur-cable<\/a><\/p>\n\n <p class=\"reference\">[26] SAB Cable. (2025). PUR Cables & Wires (TPE-U): Features, Advantages & Applications. Retrieved from <a href=\"https:\/\/www.sab-cable.com\/cables-wires-harnessing-temperature-measurement\/technical-data\/cables-and-wires\/polyurethane-pur.html\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.sab-cable.com\/polyurethane-pur-technical-data<\/a><\/p>\n\n <h3>4.4 Oil and Chemical Resistance <span class=\"bilingual\">\u8010\u6cb9\u548c\u8010\u5316\u5b66\u6027<\/span><\/h3>\n\n <p>Hard-rock mining operations typically involve extensive use of hydraulically-powered equipment, diesel-powered mobile machinery, and various lubricants and industrial chemicals. Cable sheaths must resist degradation when exposed to these substances, which can cause swelling, softening, or chemical breakdown in susceptible materials.<\/p>\n\n <p>Polyurethane offers excellent resistance to mineral oils, hydraulic fluids, diesel fuel, gasoline, and many common lubricants. The material exhibits minimal swelling or property changes when exposed to petroleum-based products, making PUR cables particularly suitable for applications around hydraulic excavators, drilling equipment, and diesel-powered mobile machinery where oil exposure is unavoidable. This oil resistance extends cable life by preventing chemical degradation of the sheath material and maintains dimensional stability even during prolonged contact with contaminated surfaces.<sup>27<\/sup><\/p>\n\n <p>5GM3 rubber compounds also provide good oil resistance as specified in the DIN VDE 0207 standard, though the degree of resistance varies depending on the specific polymer base used in the compound. Chloroprene rubber-based formulations generally offer superior oil and chemical resistance compared to styrene-butadiene rubber compounds, though still typically somewhat below the performance level of polyurethane. In practical terms, both materials perform adequately in most mining applications involving routine exposure to oils and greases, but polyurethane may demonstrate longer service life in environments with particularly heavy contamination or continuous immersion in oils.<sup>28<\/sup><\/p>\n\n <p>One important limitation of polyurethane involves its resistance to certain polar solvents and strong chemicals. While polyurethane resists non-polar hydrocarbons effectively, it can be attacked by ketones, esters, and strong acids or bases. Mining operations using specialized chemicals for ore processing or equipment cleaning should evaluate chemical compatibility for their specific substances. The 5GM3 rubber specification includes resistance testing against various chemicals, though neither material should be considered universally resistant to all possible chemical exposures without specific compatibility verification.<sup>29<\/sup><\/p>\n\n <p class=\"reference\">[27] Cables and Components. (2025). PUR Cables: Polyurethane Sheath Cables. Retrieved from <a href=\"https:\/\/www.cablesandcomponents.com\/product-category\/pur-cables-polyurethane-cables\/\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.cablesandcomponents.com\/pur-cables-polyurethane<\/a><\/p>\n\n <p class=\"reference\">[28] Power and Cables. (2017). Mining Cables Catalogue. Retrieved from <a href=\"https:\/\/www.powerandcables.com\/wp-content\/uploads\/2017\/07\/Mining-Cables-T-F-Kable-Catalogue.pdf\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.powerandcables.com\/mining-cables-catalogue<\/a><\/p>\n\n <p class=\"reference\">[29] Ruitiancables. (2025). Oil Resistant Highly Flexible PUR Polyurethane Cable. Retrieved from <a href=\"https:\/\/www.ruitiancables.com\/products\/pur-cable.html\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.ruitiancables.com\/products\/pur-cable<\/a><\/p>\n <\/section>\n\n <section>\n <h2>5. Application-Specific Recommendations <span class=\"bilingual\">\u7279\u5b9a\u5e94\u7528\u5efa\u8bae<\/span><\/h2>\n\n <p>Rather than declaring one material universally superior, the optimal choice between polyurethane and 5GM3 rubber depends on carefully matching material characteristics to the specific demands of each mining application. The following guidelines help engineers make informed material selections based on operating conditions and performance priorities.<\/p>\n\n <table>\n <caption><strong>Table 3: Application-Specific Material Selection Guide for Hard-Rock Mining<\/strong> <span class=\"bilingual\">\u786c\u5ca9\u91c7\u77ff\u5e94\u7528\u7279\u5b9a\u6750\u6599\u9009\u62e9\u6307\u5357<\/span><\/table>\n <thead>\n <tr>\n <th>Application \/ Equipment Type <span class=\"bilingual\">\u5e94\u7528\/\u8bbe\u5907\u7c7b\u578b<\/span><\/th>\n <th>Primary Material Stressors <span class=\"bilingual\">\u4e3b\u8981\u6750\u6599\u5e94\u529b<\/span><\/th>\n <th>Recommended Material <span class=\"bilingual\">\u63a8\u8350\u6750\u6599<\/span><\/th>\n <th>Justification <span class=\"bilingual\">\u7406\u7531<\/span><\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td>Surface Mining Draglines & Electric Shovels<\/td>\n <td>Severe abrasion, UV exposure, temperature extremes, continuous dragging<\/td>\n <td>Polyurethane (PUR)<\/td>\n <td>Superior abrasion resistance extends cable life significantly; excellent UV and weather resistance for surface operations<\/td>\n <\/tr>\n <tr>\n <td>Underground LHD (Load-Haul-Dump) Equipment<\/td>\n <td>Moderate to severe abrasion, impacts from falling rock, oil exposure<\/td>\n <td>Polyurethane (PUR) preferred, 5GM3 acceptable<\/td>\n <td>PUR abrasion advantage valuable in high-production operations; 5GM3 adequate for lower-intensity applications<\/td>\n <\/tr>\n <tr>\n <td>Continuous Miners (Hard Rock)<\/td>\n <td>Extreme abrasion, rock impacts, frequent reeling\/unreeling, dust<\/td>\n <td>Polyurethane (PUR)<\/td>\n <td>Maximum abrasion resistance critical; excellent flexibility for reeling applications<\/td>\n <\/tr>\n <tr>\n <td>Mobile Drilling Equipment<\/td>\n <td>Abrasion, hydraulic oil exposure, vibration, flexing<\/td>\n <td>Polyurethane (PUR)<\/td>\n <td>Oil resistance and abrasion resistance both important; maintains flexibility under heavy use<\/td>\n <\/tr>\n <tr>\n <td>Conveyor Systems (Fixed Installation)<\/td>\n <td>Moderate mechanical stress, dust, occasional impact<\/td>\n <td>5GM3 Rubber or PUR<\/td>\n <td>Fixed installation reduces abrasion severity; either material appropriate; 5GM3 offers cost advantage<\/td>\n <\/tr>\n <tr>\n <td>Underground Pump Stations<\/td>\n <td>Water immersion, moderate mechanical stress, chemical exposure<\/td>\n <td>5GM3 Rubber preferred<\/td>\n <td>Proven long-term water resistance; lower cost for fixed installation<\/td>\n <\/tr>\n <tr>\n <td>Shuttle Cars & Haul Trucks<\/td>\n <td>Severe abrasion from loaded material spillage, dragging, oil contamination<\/td>\n <td>Polyurethane (PUR)<\/td>\n <td>Abrasion from spillage is primary failure mode; oil resistance valuable<\/td>\n <\/tr>\n <tr>\n <td>Ventilation Fan Motors (Underground)<\/td>\n <td>Minimal mechanical stress, stable temperature, dust<\/td>\n <td>5GM3 Rubber<\/td>\n <td>Lower cost appropriate for benign environment; adequate performance<\/td>\n <\/tr>\n <tr>\n <td>Mobile Lighting & Auxiliary Equipment<\/td>\n <td>Frequent handling, moderate abrasion, flexing<\/td>\n <td>Polyurethane (PUR)<\/td>\n <td>Flexibility and handling resistance valuable; extended service life from reduced wear<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n\n <h3>5.1 Cost Considerations and Lifecycle Analysis <span class=\"bilingual\">\u6210\u672c\u8003\u8651\u548c\u751f\u547d\u5468\u671f\u5206\u6790<\/span><\/h3>\n\n <p>Polyurethane cables typically command a price premium of approximately twenty to forty percent compared to equivalent cables with 5GM3 rubber sheaths, reflecting the higher material costs and sometimes more complex manufacturing processes associated with thermoplastic sheath extrusion. This initial cost difference represents a significant consideration for large mining operations that may deploy tens of thousands of meters of cable across their facilities.<sup>30<\/sup><\/p>\n\n <p class=\"bilingual\">\u4e0e\u5177\u67095GM3\u6a61\u80f6\u62a4\u5957\u7684\u540c\u7b49\u7535\u7f06\u76f8\u6bd4\uff0c\u805a\u6c28\u916f\u7535\u7f06\u901a\u5e38\u9700\u8981\u5927\u7ea620%\u81f340%\u7684\u4ef7\u683c\u6ea2\u4ef7\uff0c\u8fd9\u53cd\u6620\u4e86\u66f4\u9ad8\u7684\u6750\u6599\u6210\u672c\u4ee5\u53ca\u6709\u65f6\u4e0e\u70ed\u5851\u6027\u62a4\u5957\u6324\u538b\u76f8\u5173\u7684\u66f4\u590d\u6742\u7684\u5236\u9020\u8fc7\u7a0b\u3002<\/p>\n\n <p>However, lifecycle cost analysis that accounts for cable replacement frequency often demonstrates that polyurethane provides superior total cost of ownership in applications where abrasive wear dominates cable failure. If polyurethane extends cable life by a factor of two or more in severe abrasive environments\u2014a conservative estimate based on field reports\u2014the increased purchase price is more than offset by reduced replacement frequency, lower installation labor costs, and decreased downtime for cable change-outs. For a trailing cable on a continuous miner operating in hard granite, for example, the cost per operating hour may be significantly lower with polyurethane despite the higher initial investment.<sup>31<\/sup><\/p>\n\n <p>Conversely, in applications where cables do not experience severe abrasive wear or where cable failures result primarily from factors other than sheath abrasion (such as conductor damage, insulation failure, or mechanical crushing), the extended sheath life provided by polyurethane may not translate into proportionally longer overall cable life. In these situations, the lower initial cost of 5GM3 rubber cables may represent the more economical choice, as the cable replacement interval is determined by factors other than sheath wear resistance.<sup>32<\/sup><\/p>\n\n <p class=\"reference\">[30] Anyte Cable. (2024). PUR Multi Core Cable: China Cable Manufacturer. Retrieved from <a href=\"https:\/\/www.cndldl.com\/products\/pur-multi-core-cable\/\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.cndldl.com\/products\/pur-multi-core-cable<\/a><\/p>\n\n <p class=\"reference\">[31] Miningcable South Africa. (2025). How to Select the Right Mining Cables for South African Operations. Retrieved from <a href=\"https:\/\/www.miningcable.co.za\/how-to-select-the-right-mining-cables-for-south-african-operations\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.miningcable.co.za\/select-right-mining-cables-south-africa<\/a><\/p>\n\n <p class=\"reference\">[32] Amplexmining Australia. (2025). Cable Selection in Mining Operations: A Comprehensive Guide. Retrieved from <a href=\"https:\/\/www.amplexmining.com.au\/cable-selection-in-mining-operations-a-comprehensive-guide\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/www.amplexmining.com.au\/cable-selection-mining-operations<\/a><\/p>\n <\/section>\n\n <section>\n <h2>6. Practical Implementation Considerations <span class=\"bilingual\">\u5b9e\u9645\u5b9e\u65bd\u8003\u8651\u56e0\u7d20<\/span><\/h2>\n\n <p>Beyond material selection, successful deployment of cables in hard-rock mining requires attention to proper installation practices, handling procedures, and maintenance protocols that maximize the performance advantages of whichever material is chosen.<\/p>\n\n <h3>6.1 Installation Best Practices <span class=\"bilingual\">\u5b89\u88c5\u6700\u4f73\u5b9e\u8df5<\/span><\/h3>\n\n <p>Both polyurethane and rubber-sheathed cables require care during installation to prevent damage that could compromise subsequent service life. Minimum bend radius specifications must be strictly observed, with polyurethane cables typically requiring somewhat larger bend radii due to their higher hardness. Cable manufacturers provide specific minimum bend radius values, usually expressed as a multiple of cable outside diameter, that differ for fixed installations versus dynamic applications involving repeated flexing.<sup>33<\/sup><\/p>\n\n <p>Temperature during installation affects handling characteristics, particularly for polyurethane cables. When installing cables in cold ambient conditions below ten degrees Celsius, polyurethane sheaths may exhibit increased stiffness that makes pulling more difficult and increases the risk of jacket cracking if excessive bending forces are applied. Pre-warming cables or conducting installations during warmer periods helps avoid these problems. Rubber-sheathed cables generally show less temperature sensitivity during installation, remaining flexible across a broader temperature range without special handling requirements.<sup>34<\/sup><\/p>\n\n <p class=\"reference\">[33] Titan WNC. (2025). Cable Needs for Mining Industry: Essential Solutions for Safety and Efficiency. Retrieved from <a href=\"https:\/\/titanwnc.com\/2025\/08\/cable-needs-for-mining-industry\/\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/titanwnc.com\/cable-needs-for-mining-industry<\/a><\/p>\n\n <p class=\"reference\">[34] MISUMI USA. (2025). Cable Jacket Material Guide: PVC vs PUR vs TPE. Retrieved from <a href=\"https:\/\/us.misumi-ec.com\/blog\/cable-jacket-material\/\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/us.misumi-ec.com\/blog\/cable-jacket-material<\/a><\/p>\n <\/section>\n\n <section class=\"company-info\">\n <h2>About Anhui Feichun Special Cable Co., Ltd. <span class=\"bilingual\">\u5173\u4e8e\u5b89\u5fbd\u98de\u7eaf\u7279\u79cd\u7535\u7f06\u6709\u9650\u516c\u53f8<\/span><\/h2>\n \n <p>Anhui Feichun Special Cable Co., Ltd. specializes in manufacturing high-performance cables for demanding mining applications, including both premium polyurethane-sheathed (N)12Y series and traditional 5GM3 rubber-sheathed constructions. Our engineering team provides comprehensive technical support to help mining operations select the optimal cable construction for their specific operating conditions, equipment types, and performance requirements.<\/p>\n \n <p class=\"bilingual\">\u5b89\u5fbd\u98de\u7eaf\u7279\u79cd\u7535\u7f06\u6709\u9650\u516c\u53f8\u4e13\u4e1a\u4ece\u4e8b\u7528\u4e8e\u82db\u523b\u91c7\u77ff\u5e94\u7528\u7684\u9ad8\u6027\u80fd\u7535\u7f06\u7684\u5236\u9020\uff0c\u5305\u62ec\u9ad8\u7ea7\u805a\u6c28\u916f\u62a4\u5957\uff08N\uff0912Y\u7cfb\u5217\u548c\u4f20\u7edf5GM3\u6a61\u80f6\u62a4\u5957\u7ed3\u6784\u3002\u6211\u4eec\u7684\u5de5\u7a0b\u56e2\u961f\u63d0\u4f9b\u5168\u9762\u7684\u6280\u672f\u652f\u6301\uff0c\u5e2e\u52a9\u91c7\u77ff\u4f5c\u4e1a\u6839\u636e\u5176\u7279\u5b9a\u7684\u64cd\u4f5c\u6761\u4ef6\u3001\u8bbe\u5907\u7c7b\u578b\u548c\u6027\u80fd\u8981\u6c42\u9009\u62e9\u6700\u4f73\u7684\u7535\u7f06\u7ed3\u6784\u3002<\/p>\n\n <p>Our cable constructions comply with international mining standards including DIN VDE 0250, DIN VDE 0207, MSHA approvals where applicable, and AS\/NZS standards for Australian and New Zealand markets. We maintain rigorous quality control throughout manufacturing to ensure consistent performance in the severe operating environments characteristic of hard-rock mining operations worldwide.<\/p>\n\n <p>Whether your application demands the maximum abrasion resistance of advanced polyurethane sheaths or the proven reliability and value of 5GM3 rubber construction, Feichun Cables delivers engineered solutions backed by comprehensive technical documentation, application support, and responsive customer service.<\/p>\n\n <div class=\"contact-info\">\n <p><strong>Contact Information <span class=\"bilingual\">\u8054\u7cfb\u65b9\u5f0f<\/span>:<\/strong><\/p>\n <p>\n WhatsApp: <a href=\"https:\/\/wa.me\/8613855123218\" rel=\"nofollow noopener\" target=\"_blank\">+86 13855123218<\/a>\n <\/p>\n <p>\n Technical Support Email: \n <a href=\"mailto:tech@feichuncables.com\" rel=\"nofollow\">tech@feichuncables.com<\/a>\n <\/p>\n <p>\n Sales Inquiries: \n <a href=\"mailto:zihao.yang@feichuncables.com\" rel=\"nofollow\">zihao.yang@feichuncables.com<\/a> | \n <a href=\"mailto:ziyu.huang@feichuncables.com\" rel=\"nofollow\">ziyu.huang@feichuncables.com<\/a>\n <\/p>\n <\/div>\n <\/section>\n <\/main>\n\n <footer>\n <p><strong>References and Standards:<\/strong><\/p>\n <p>This technical comparison references international standards including DIN VDE 0207 Part 21 for rubber compounds, DIN VDE 0250 for mining cables, DIN 53516 for abrasion testing, and various MSHA, AS\/NZS, and IEC standards applicable to mining cable applications. Technical information is based on material specifications from cable manufacturers, polymer suppliers, and field performance data from mining operations worldwide.<\/p>\n \n <p style=\"margin-top: 20px;\">\u00a9 2026 Anhui Feichun Special Cable Co., Ltd. All technical information provided for engineering reference purposes. Material selection should be based on comprehensive analysis of specific application requirements, operating conditions, and total lifecycle cost considerations. Consult with qualified cable engineers and follow all applicable mining safety regulations and cable installation standards for your jurisdiction and operation type.<\/p>\n <\/footer>\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"Hard-rock mining operations present some of the most severe mechanical challenges for cable materials in any industrial environment. Unlike coal mining where the surrounding geology consists of relatively softer sedimentary rock formations, hard-rock mining for metals such as gold, copper, platinum, iron ore, and other valuable minerals involves working with extremely abrasive geological materials. Granite, basalt, quartzite, and metamorphic rocks create an environment where cables are constantly subjected to cutting, gouging, and grinding forces that can rapidly destroy inadequately protected cable sheaths.1\n\u786c\u5ca9\u91c7\u77ff\u4f5c\u4e1a\u5bf9\u7535\u7f06\u6750\u6599\u5728\u4efb\u4f55\u5de5\u4e1a\u73af\u5883\u4e2d\u90fd\u63d0\u51fa\u4e86\u4e00\u4e9b\u6700\u4e25\u5cfb\u7684\u673a\u68b0\u6311\u6218\u3002\u4e0e\u7164\u77ff\u5f00\u91c7\u5468\u56f4\u5730\u8d28\u7531\u76f8\u5bf9\u8f83\u8f6f\u7684\u6c89\u79ef\u5ca9\u5c42\u7ec4\u6210\u4e0d\u540c\uff0c\u5f00\u91c7\u91d1\u3001\u94dc\u3001\u94c2\u3001\u94c1\u77ff\u77f3\u548c\u5176\u4ed6\u8d35\u91cd\u77ff\u7269\u7684\u786c\u5ca9\u91c7\u77ff\u6d89\u53ca\u4e0e\u6781\u5177\u78e8\u8680\u6027\u7684\u5730\u8d28\u6750\u6599\u4e00\u8d77\u5de5\u4f5c\u3002","protected":false},"author":1,"featured_media":5196,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_singular_sidebar":"left","csco_page_header_type":"title","csco_page_load_nextpost":"","footnotes":""},"categories":[66,464,1,56],"tags":[35026,35027,779,7713,535,541,35036,31624,31735,26599,35044,35024,35053,35019,21000,35008,28986,35038,1114,35035,1064,35033,35010,35031,563,35039,16,1079,1958,1712,35000,1757,35049,35037,6427,1907,35012,35046,1116,35032,35030,35002,35048,22706,35028,35034,1682,35045,1879,35018,8392,1710,35004,35029,34837,35023,1696,35052,1903,6337,34999,35007,35040,35047,35006,35021,35001,9118,35042,30859,35014,210,35003,1262,35015,9119,35041,35013,801,35020,3186,35005,35054,35017,1232,35011,9024,9123,35016,35051,35009,35022,35050,9121,1411,10543,1400,5009,1689,6208,35043],"class_list":["post-5195","post","type-post","status-publish","format-standard","has-post-thumbnail","category-common-problems-encountered-in-cable-applications","category-flexible-cables-with-high-bending-life-and-fatigue-resistance","category-uncategorized","category-reeling-cable","tag-30-cfr-part-56","tag-30-cfr-part-57","tag-3gi3-epr-insulation","tag-5gm3-compound","tag-5gm3-rubber","tag-5gm5-rubber","tag-abrasion-resistance-comparison-pur-vs-rubber-mining-cable","tag-abrasion-resistant-cable-sheath","tag-as-nzs-1802","tag-as-nzs-2802","tag-best-cable-material-hard-rock-mining-operations","tag-cable-reel","tag-cable-replacement-frequency-cost-analysis","tag-cable-sheath-comparison","tag-chlorinated-polyethylene","tag-chloroprene-rubber","tag-chlorosulfonated-polyethylene","tag-cold-temperature-flexibility-mining-cable-comparison","tag-continuous-miner-cable","tag-continuous-miner-trailing-cable-material-selection","tag-conveyor-cable","tag-cpe-cable","tag-cr-rubber","tag-csp-cable","tag-din-vde-0207-part-21","tag-din-vde-0207-part-21-5gm3-specification","tag-din-vde-0250","tag-dragline-cable","tag-electric-shovel-cable","tag-epr-cable","tag-ether-based-pur","tag-ethylene-propylene-rubber","tag-extended-cable-life-polyurethane-sheath","tag-field-performance-pur-cable-hard-rock-mining","tag-fire-retardant-cable","tag-flame-resistant-mining-cable","tag-gm1b-rubber","tag-hard-rock-mining-cable-sheath-requirements","tag-haul-truck-cable","tag-hd-85-pcp","tag-heavy-duty-pcp","tag-heavy-duty-polyurethane","tag-hydraulic-equipment-cable-oil-resistance","tag-hypalon-cable","tag-iec-mining-cable","tag-industrial-cable-alternatives","tag-lhd-vehicle-cable","tag-lifecycle-cost-analysis-pur-mining-cable","tag-lifecycle-cost-cable","tag-material-comparison-mining-cable","tag-material-trade-offs","tag-mining-cable-standards","tag-mining-pur-cable","tag-mining-regulations-compliance","tag-mining-safety-standards","tag-mobile-drilling-cable","tag-mobile-equipment-cable","tag-mobile-mining-equipment-cable-requirements","tag-msha-approved-cable","tag-msha-certified","tag-n12y-sheath","tag-neoprene-sheath","tag-notch-resistance-tear-propagation-pur-cable","tag-oil-resistant-mining-cable-pur-vs-rubber","tag-pcp-rubber","tag-performance-comparison-cable-materials","tag-polyether-polyurethane","tag-polyurethane-cable","tag-polyurethane-cable-abrasion-resistance-5-times-rubber","tag-polyurethane-sheath","tag-polyurethane-vs-rubber","tag-portable-power-cable","tag-pu-cable","tag-pump-station-cable","tag-pur-advantages","tag-pur-cable","tag-pur-polyurethane-better-than-5gm3-rubber-hard-rock-mining","tag-pur-vs-rubber","tag-reeling-drum-cable","tag-rubber-advantages","tag-rubber-sheathed-cable","tag-sbr-cable","tag-severe-abrasive-environment-cable-selection","tag-sheath-material-selection","tag-shuttle-car-cable","tag-styrene-butadiene-rubber","tag-synthetic-rubber-cable","tag-thermoplastic-polyurethane","tag-thermoplastic-vs-thermosetting","tag-thermoplastic-vs-thermosetting-mining-cable-sheath","tag-thermosetting-rubber","tag-total-cost-ownership-cable","tag-total-cost-ownership-polyurethane-vs-rubber-cable","tag-tpu-cable","tag-type-g-cable","tag-type-shd-gc","tag-type-w-cable","tag-underground-loader-cable","tag-ventilation-fan-cable","tag-vulcanized-rubber-cable","tag-when-to-use-polyurethane-sheath-vs-rubber-sheath","cs-entry"],"_links":{"self":[{"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts\/5195","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/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{"id":5195,"date":"2026-01-27T10:01:41","date_gmt":"2026-01-27T02:01:41","guid":{"rendered":"https:\/\/feichuncables.com\/blog\/?p=5195"},"modified":"2026-01-27T10:01:45","modified_gmt":"2026-01-27T02:01:45","slug":"pur-polyurethane-sheath-vs-5gm3-rubber-material-comparison-for-abrasive-hard-rock-mining","status":"publish","type":"post","link":"https:\/\/feichuncables.com\/blog\/pur-polyurethane-sheath-vs-5gm3-rubber-material-comparison-for-abrasive-hard-rock-mining\/","title":{"rendered":"PUR\/Polyurethane Sheath vs 5GM3 Rubber: Material Comparison for Abrasive Hard-Rock Mining"},"content":{"rendered":"\n

Is (N)12Y Polyurethane Sheath Better Than 5GM3 Rubber for Hard-Rock Mining Operations?<\/strong> \u805a\u6c28\u916f\u62a4\u5957\u662f\u5426\u4f18\u4e8e5GM3\u6a61\u80f6\u7528\u4e8e\u786c\u5ca9\u91c7\u77ff\u4f5c\u4e1a\uff1f<\/p>\n\n\n\n