Application
Colnex-SR cold shrink tube is made from highly weather-resistant silicone rubber, pre-expanded on a removable supporting core. During installation, simply remove the core and the tube instantly contracts to tightly seal cable joints, providing efficient insulation and protection. No heating or special tools are required, making the installation process fast and safe—even in confined spaces or fire-restricted environments. Colnex-SR is widely used for sealing and protecting communication base station cable connectors, making it the preferred choice for rapid and reliable sealing in modern communication projects.
Features and Benefits
• Made of highly weather-resistant silicone rubber, UV and acid/alkali resistant
• Pre-expanded design, no heating or tools required, fast and safe installation
• Excellent mechanical and electrical properties
• Ideal for confined or fire-restricted environments
• Widely used for fast protection of communication base stationcable joints
| Property | Requirement | Test Method | Typical Data |
| Operating Temperature | / | / | -55℃ to +200℃ |
| Storage life recommended | / | / | 1 year |
| Hardness | Shore A26 | ASTM D 2240 | Shore A26 |
| Tensile strength | ≥7.0MPa | ASTM D 412 | ≥7.0MPa |
| Elongation at break | ≥840% | ASTM D 412 | ≥840% |
| Tear Strength | ≥35KN/m | ASTM D 412 | ≥35KN/m |
| Ultraviolet Exposing Test | Pass | ASTM G 154 | Pass |
| Salt Spray Testing | Pass | ASTM B 117 | Pass |
| Diameter retraction shrinkage | Pass | 180 days/80% and more | Pass |
Color
Grey, Black
Product Dimension

| Table A. Product Dimensions | |||||
| Part No. | Size | As supplied (mm) | After recovered(mm) | Application Range (mm) | |
| (Φ mm) | I.D.min (D) | I.D.max (d) | Length | ||
| Colnex-SR-25 | 25 | 25 | 6 | 130 | 7.3~21 |
| Colnex-SR-28 | 28 | 28 | 8 | 130 | 11.9~31 |
| Colnex-SR-30 | 30 | 30 | 8 | 130 | 11.9~31 |
| Colnex-SR-35 | 35 | 35 | 9 | 130 | 11.9~31 |
| Colnex-SR-40 | 40 | 40 | 10 | 130 | 13.5~39 |
| Colnex-SR-45 | 45 | 45 | 10 | 130 | 15~39 |
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.