Detailed Description
PUR vs CR (Neoprene) — The Reeling Jacket Decision
For decades, CR (neoprene / polychloroprene) was the default reeling cable jacket. It is robust, oil-resistant, flame-retardant, and proven in mining and heavy crane applications. But CR has two fundamental limitations:
- It contains chlorine: When burned, CR releases hydrogen chloride gas — corrosive and toxic. This disqualifies CR for enclosed spaces (tunnels, underground), marine interiors, and any application with stringent fire safety requirements for personnel
- It is not halogen-free: Modern environmental regulations increasingly mandate halogen-free materials — CR cannot comply
The decision to switch from CR to PUR depends on your operating environment:
| Selection Criteria | Choose CR (Neoprene) | Choose PUR |
|---|---|---|
| Mining — MSHA 30 CFR Part 18 required | ✅ Required | Additional certification needed |
| Underground mining (fire safety) | ✅ Self-extinguishing | Additional certification needed |
| Cold climate (< -25°C) | ❌ Stiffens | ✅ Flexible to -40°C |
| Marine / seawater | Good | Excellent |
| Wastewater / high humidity | Moderate (chlorine risk) | Excellent |
| Halogen-free required | ❌ Contains chlorine | ✅ IEC 60754-1 certified |
| Maximum reeling life | >100 000 cycles | >300 000 cycles |
| Cost efficiency (short reeling life OK) | Lower initial cost | Higher initial, lower lifetime cost |
PUR Reeling Advantages — Quantified
| Performance Metric | CR (Neoprene) | PUR |
|---|---|---|
| Abrasion (Taber) | ≤15 mg | ≤5 mg — 3× better |
| Oil resistance (IEC 60811-404) | Good | Excellent — no swelling |
| Temperature moving | -25°C to +70°C | -40°C to +80°C |
| Reeling cycles at 15:1 D/d | >100 000 | >300 000 |
| UV / outdoor life | Good (with carbon black) | Excellent — certified ISO 4892-2 |
| Hydrolysis (wet environment) | Moderate | Excellent — polyether PUR |
| Weight (same cross-section) | Heavier | ~15% lighter — reduced reel drive sizing |
| Halogen content | Contains chlorine | Zero — halogen-free |
Marine and Offshore — Where PUR Excels
Seawater, salt spray, constant UV exposure, and wide temperature swings from Arctic to tropical conditions make marine reeling one of the most demanding cable environments. PUR outperforms every alternative:
- Seawater resistance: PUR is inherently hydrophobic. Water absorption after 24 h immersion is <0.5% — compared to 3–5% for CR. Low water absorption means stable electrical properties and no jacket degradation
- UV stability: Certified to ISO 4892-2 for 36-month equivalent outdoor exposure without degradation — no surface chalking, no cracking, no loss of mechanical properties. CR requires carbon black for UV protection; PUR is stable with or without carbon black
- Hydrolysis resistance: Polyether PUR (our standard for reeling) resists the chemical breakdown caused by water at elevated temperatures. Polyester PUR would degrade in these conditions — we specify polyether PUR for all marine and wet applications
- Microbe resistance: PUR does not support microbial growth — important for cables that spend time in biologically active harbor or river water
Why Choose Yichi Cable PUR Reeling?
- Polyether PUR only for wet/marine: We default to hydrolysis-resistant polyether PUR for all reeling cables — no risk of polyester PUR degrading in your marine or wet environment
- Reeling life verified: Our >300 000 cycle rating is based on actual drum reeling tests at 15:1 D/d in our CNAS-accredited lab — not calculated or extrapolated
- Tensile engineering: We calculate the required steel wire or Kevlar cross-section based on your reel depth, cable weight, and winding tension — not a generic "reinforced" claim
- Compression-tested construction: Our PUR reeling cable core is tested under simulated multi-layer drum compression to verify no conductor deformation after 100 000 cycle equivalents
- Orange and yellow colors: High-visibility jacket colors for safety-critical crane and marine applications — standard stock, no minimum order