Application
Colnex-EP cold shrink tube is made from weather-resistant EPDM rubber, pre-expanded on a removable plastic core. During installation, simply remove the core, and the tube immediately contracts to form a tight, protective seal around cable joints—no heat or special tools required. This enables rapid, safe application even in confined or fire-restricted environments. Widely used for insulation and sealing of overhead or buried power cables and base station connectors under 1kV, Colnex-EP is the optimal solution for users seeking reliable protection and efficient installation.
Features and Benefits
• Shrink ratio ≈2:1
• Weather-resistant EPDM rubber, UV and acid/alkali resistant
• No heating or tools required, fast and easy installation
• Excellent mechanical and electrical properties
• Suitable for confined or fire-restricted areas
| Property | Requirement | Test Method | Typical Data |
| Operating Temperature | / | / | -55℃ to +150℃ |
| Storage life recommended | / | / | 1 year |
| Hardness | Shore A46 | ASTM D 2240 | Shore A46 |
| Tensile strength | ≥7.5MPa | ASTM D 412 | ≥7.5MPa |
| Elongation at break | ≥670% | ASTM D 412 | ≥670% |
| Water absorption | WT Gain 1.3% | 24hrs in water at 90℃ | WT Gain 1.3% |
| Dielectric strength | ≥8kV/mm | ASTM D 149 | ≥8kV/mm |
Product Dimension

| Table A. Product Dimensions | |||||
| Shrink Ratio | Part No. | Size (Φ mm) | As supplied (mm) | After recovered(mm) | |
| I.D.min (D) | I.D.max (d) | Length | |||
| 2:1 | Colnex-EP-21205 | 21 | 21 | 10.2 | 205 |
| Colnex-EP-30229 | 30 | 30 | 13.9 | 229 | |
| Colnex-EP-30279 | 30 | 30 | 13.9 | 279 | |
| Colnex-EP-36305 | 36 | 36 | 16.8 | 305 | |
| Colnex-EP-49152 | 49 | 49 | 24 | 152 | |
| Colnex-EP-49305 | 49 | 49 | 24 | 305 | |
| Colnex-EP-49457 | 49 | 49 | 24 | 457 | |
| Colnex-EP-70229 | 70 | 70 | 32.2 | 229 | |
| Colnex-EP-70457 | 70 | 70 | 32.2 | 457 | |
Custom sizes and colors are available upon request. Technical specifications are subject to change without prior notice. Minimum order quantities (MOQ) may differ from standard packaging quantities.