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The inner wrap is composed of a layer of non-crystalline, low-viscosity, and non-reactive polyolefin-based compound, reinforced with a fabric layer, and the polyolefin-based compound bonds directly to the substrate.
The second or outer polymeric tape layer is a two-layer wrapping tape. It has a polyvinyl chloride (PVC), polyethylene (PE), or polypropylene (PP) backing layer with a laminated butyl-rubber adhesive on one side. The outer-layer tape is compatible with the inner-layer tape and offers robust mechanical protection.
| Viscous elastic inner layer | ||
| Item | Spec. | Performance |
| Width | 100mm±10% | 99.5mm |
| Thickness | ＞1.5mm | 1.98mm |
| Glass transition temperature | Tmin=-20℃ | T min=-20℃ |
| Crystallization temperature | No evidence of crystallization | No evidence of crystallization |
| Holiday detection at 5KV/mm, max. 25KV | No holiday | No holiday |
| Drip resistance | No dripping of compound | No dripping |
| Lap shear strength at 23℃ | ＞0.004N/mm² | 0.027 N/mm² |
| Lap shear strength at 70℃ | ＞0.002N/mm² | 0.00532N/mm² |
| PVC outer wrap | ||
| Peel strength, outer wrap to outer wrap | ||
| 23℃ | ＞0.2N/mm | ＞0.2N/mm |
| 70℃ | ＞0.02N/mm | ＞0.02N/mm |
| Total coating system | ||
| Impact resistance 2J/mm, 10 times | No holiday | No holiday |
| Indentation resistance at pressure 1.0N/mm² | ||
| Holiday detection at 25KV | No holiday | No holiday |
| Residual thickness | Min. 0.6mm | 1.39mm |
| Self-heating effect on Dia. 6mm artificial defect (inner wrap), 24 hrs | No holiday | No holiday |
