Material Science: How does the outer sheath compound 5GM3 differ from 5GM5 in terms of oil resistance and mechanical strength?
Published by: Anhui Feichun Special Cable Co., Ltd.
Specialists in Heavy-Duty Polymer Engineering for Cables
1. Executive Summary: The Hierarchy of Toughness
2. Detailed Property Comparison (DIN VDE 0207-21)
The following table illustrates the baseline requirements. Note that Anhui Feichun’s internal standards often exceed these minimums.
| Property (性能) | 5GM3 (Heavy Duty) | 5GM5 (Extra Heavy / Reeling) |
|---|---|---|
| Tensile Strength (Unaged) 抗拉强度（未老化） | ≥ 15 N/mm² ≥ 15 N/mm² | ≥ 15 N/mm² (Often formulated >20) ≥ 15 N/mm² (通常配制 >20) |
| Tear Resistance 抗撕裂强度 | Moderate Requirement 中等要求 | Extremely High Requirement Crucial to prevent cuts from propagating on sharp rocks. 极高要求 防止切口在尖锐岩石上扩展的关键。 |
| Oil Resistance (IRM 902) 耐油性 | Good. Volume change ±30% after 24h @ 100°C. 良好。 100°C 下 24小时后体积变化 ±30%。 | Excellent. Often tighter tolerance, designed for hot hydraulic fluid immersion. 优异。 通常具有更严格的公差，专为热液压油浸泡设计。 |
| Typical Cable Types 典型电缆类型 | (N)SSHÖU, NSGAFÖU (Mining connection, Switchgear) (N)SSHÖU, NSGAFÖU （矿用连接，开关柜） | (N)TSCGEWÖU, (N)TSKCGEWÖU (Reeling Drums, High-Speed Festoons) (N)TSCGEWÖU, (N)TSKCGEWÖU （卷盘卷筒，高速拖令） |
3. Mechanical Strength: Why 5GM5 Wins in Dynamics
The Scenario: A mining cable is dragged over a sharp piece of shale, creating a small cut in the outer jacket.
With 5GM3: As the cable is flexed or reeled, the cut may grow (propagate), eventually exposing the insulation.
With 5GM5: The cross-linking density and polymer chain structure are engineered to stop the cut. The energy required to continue a tear is significantly higher. This is vital for Reeling Cables which are under constant tension (15-20 N/mm²) while bending.
场景： 矿用电缆在尖锐的页岩上拖曳，在外护套上造成一个小切口。
使用 5GM3： 当电缆弯曲或卷绕时，切口可能会增长（扩展），最终暴露绝缘层。
使用 5GM5： 交联密度和聚合物链结构被设计用来阻止切口。继续撕裂所需的能量明显更高。这对于在弯曲时处于恒定张力（15-20 N/mm²）下的卷盘电缆至关重要。
4. Oil Resistance: Surviving the Environment
Contact Anhui Feichun Special Cable Co., Ltd.
Consult us for Heavy Duty 5GM3 & 5GM5 Cables
Authoritative References & Standards:
- DIN VDE 0207 Part 21: Insulating and sheathing compounds for cables and flexible cords – Rubber sheathing compounds.
- EN 60811-404: Insulating and sheathing materials of electric and optical cables – Common test methods – Oil resistance tests.
- DIN VDE 0298-3: Guide to use for cables and insulated wires.
![The maximum conductor operating temperature is a critical parameter that determines a cable's current-carrying capacity, service life, and application suitability. For VDE-certified cables, EPR (Ethylene Propylene Rubber) insulation permits a continuous conductor operating temperature of 90°C, representing a significant advancement over older rubber insulation technologies which were typically limited to 60°C–70°C.[1][2] 最高导体工作温度是决定电缆载流量、使用寿命和应用适用性的关键参数。对于VDE认证电缆，EPR（乙丙橡胶）绝缘允许90°C的连续导体工作温度，相比传统橡胶绝缘（60°C–70°C）有显著提升。](https://feichuncables.com/blog/wp-content/uploads/image-574-400x225.avif "What is the Maximum Conductor Operating Temperature Allowed for VDE Cables Insulated with EPR (90°C) vs. Older Rubber Types? 3")
