Introduction: The Copper-Only Spreader Cable with the Best Insulation

SPREADERFLEX REEL XPRT (N)SHTOEU is the copper-only counterpart of the Cordaflex (SMK)-V-FO — sharing the same Class FS conductors, aramide self-supporting element, PCP rubber sheath, and 240 m/min vertical reeling capability, but without integrated fiber optics. It is designed for the large installed base of STS crane spreaders that do not require fiber optic communication — spreaders using copper-only control signals, or cranes where fiber optic data is provided through a separate dedicated cable or wireless link.

But the REEL XPRT is not merely the (SMK)-V-FO minus fiber. It introduces a critical insulation upgrade: ETFE (ethylene tetrafluoroethylene) — a fluoropolymer insulation that is categorically superior to the polyolefin used in the (SMK)-V-FO and the EPR 3GI3 used in every other cable in this guide series. ETFE achieves 80–100 kV/mm dielectric strength (vs. ~20 kV/mm for EPR), withstands the 250°C short-circuit temperature (explicitly rated on this datasheet but not on the (SMK)-V-FO), and resists virtually every industrial chemical, solvent, and acid. Combined with the penta-environmental certification (flame + UV + oil + ozone + water — the most comprehensive of any cable in this guide), the REEL XPRT represents the absolute highest-specification copper-only vertical spreader cable available.

Technical Anatomy: Full Specification

4 Configurations with OD Tolerance Bands

ETFE vs. Polyolefin vs. EPR: Why ETFE Wins for Spreader Reels

ETFE (ethylene tetrafluoroethylene) is a fluoropolymer — a class of materials that includes PTFE (Teflon) and FEP. ETFE is the insulation material of choice for the most demanding aerospace, nuclear, and military cable applications. Its appearance in a crane spreader cable represents the highest-specification insulation choice available in the port crane industry. The REEL XPRT is the only cable in this entire guide series to use ETFE insulation.

ETFE’s near-universal chemical resistance is particularly valuable for spreader cables. Container crane spreaders operate in an environment where hydraulic oil from twist-lock actuators, diesel exhaust from auxiliary generators, saltwater spray from below, and cleaning solvents from deck-wash operations all contact the cable surface and can migrate through sheath damage to reach the insulation. Where polyolefin or EPR would swell, soften, or degrade over years of chemical exposure, ETFE remains chemically inert — its fluoropolymer backbone is impervious to virtually every industrial chemical encountered in port operations.

20×OD S-Type Directional Change: The Unique Mechanical Specification

The REEL XPRT introduces a specification that no other cable in this guide series provides: minimum distance with S-type directional changes: 20×OD. This defines the minimum straight-cable length required between two opposing bends (an “S-curve”) during cable routing. For the 56×2.5 at 43.1 mm max OD: 20 × 43.1 = 862 mm minimum between reverse bends.

S-type directional changes occur at specific locations in vertical spreader reel systems: where the cable exits the reel drum, passes through a guide roller, changes direction, and enters the vertical drop shaft. This transition creates an S-curve with two opposing bends in rapid succession. If the straight section between the bends is too short, the cable experiences combined bending and torsional stress that exceeds the limits of any single-bend specification. The 20×OD minimum ensures the cable has sufficient length to relax between bends — preventing the cumulative stress that causes accelerated fatigue at S-curve transition points. Crane designers must verify that their reel departure geometry provides at least 20×OD straight-cable distance between opposing guide rollers.

Penta-Environmental Certification: Five Simultaneous Resistances

The REEL XPRT achieves five independently certified environmental resistances — the most comprehensive environmental certification of any cable in this guide:

This penta-certification is achievable because the 5GM5 PCP (polychloroprene) outer sheath is the toughest standard sheath compound in the VDE system, providing inherent flame retardancy, oil resistance, and ozone resistance. The explicit ozone resistance and water resistance certifications distinguish the REEL XPRT from the Cordaflex (SMK)-V-FO (which lists only UV and oil resistance). For spreader cables hanging exposed in the vertical shaft of an STS crane — subject to coastal ozone, rain, and salt spray throughout their operational life — these additional certifications provide documented assurance that the sheath will not degrade under the complete spectrum of environmental stresses.

REEL XPRT vs. Cordaflex (SMK)-V-FO: Copper-Only vs. Fiber Optic

Choose SPREADERFLEX REEL XPRT when: the spreader does not require fiber optic communication, and you want the best possible insulation (ETFE), the most comprehensive environmental certification (penta), documented 250°C short-circuit survival, and the S-type directional change specification for engineering verification. Choose Cordaflex (SMK)-V-FO when: integrated fiber optic data is required alongside copper control cores, and you need the tightest possible moving bend (4×OD vs. 5×OD).

Cost-Effective Alternative from Feichun

Feichun Lead Times: 8–12 weeks. European (Klaus Faber/Prysmian): 24–34 weeks (ETFE + Class FS = longest-lead-time specification).

Technical FAQ

Why does the REEL XPRT have 5×OD moving bend while the (SMK)-V-FO achieves 4×OD?

ETFE insulation, while thinner than EPR, is slightly stiffer than polyolefin at extreme bending radii. The 5×OD moving specification reflects ETFE’s higher modulus at the bending point — it resists deformation more than polyolefin, requiring a marginally larger radius to avoid insulation micro-cracking during millions of dynamic bending cycles. The (SMK)-V-FO’s softer polyolefin insulation achieves 4×OD moving. The practical impact: the REEL XPRT requires a reel drum core diameter approximately 20% larger than the (SMK)-V-FO at equivalent OD. For the 56×2.5 at 43.1 mm max OD: REEL XPRT minimum drum core radius = 5 × 43.1 = 216 mm; (SMK)-V-FO minimum = 4 × 44.3 = 177 mm.

Why 4×OD fixed but 5×OD moving? Shouldn’t fixed be larger?

This is counterintuitive but correct. In fixed installation (cable permanently bent and not moving), the cable experiences static bending stress but no fatigue cycling. ETFE’s high yield strength allows it to sustain a tighter static bend (4×OD) without permanent deformation. In moving applications (dynamic reeling), the cable experiences millions of bending cycles — and ETFE’s slightly higher stiffness means each cycle generates more micro-stress at 4×OD than polyolefin would. The 5×OD moving specification provides the fatigue margin needed for the cable’s target 10+ year dynamic service life.

Can I add fiber optics to a REEL XPRT cable?

No — the REEL XPRT is a copper-only design with all interstices occupied by copper control cores and the aramide self-supporting element. Adding fiber tubes would require removing copper cores, changing the cable geometry, and creating a different product — which is precisely the Cordaflex (SMK)-V-FO. If you need both copper and fiber in a single vertical spreader cable, specify the (SMK)-V-FO instead.

What is ETFE and why is it not used in every cable?

ETFE (ethylene tetrafluoroethylene) is a fluorinated copolymer manufactured by companies including Chemours (Tefzel®), AGC (Fluon®), and Daikin. It costs approximately 8–12× more per kilogram than standard EPR insulation compound. This cost premium — multiplied across 56 cores — significantly increases the cable’s material cost. ETFE is specified only where its superior properties (extreme dielectric strength, chemical inertness, thin-wall capability, and 250°C short-circuit survival) are essential. For standard horizontal drum reeling where EPR or rubber insulation provides adequate performance, ETFE’s cost premium is not justified.