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China Silicone Cold Shrink Tube Factory - High-Performance Cable Insulation Suppliers
Product Features
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Cold Shrink Installation, Convenient & Safe
Eliminates traditional heat-shrink methods. Installation requires no special heating equipment or open flame, simplifying and speeding up the process while removing fire hazards. Ideal for explosive atmospheres or confined spaces.
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Exceptional Elasticity & Radial Pressure
The tubing possesses strong resilience and constant radial contraction force, ensuring a tight seal remains intact despite cable thermal expansion/contraction or vibration, providing long-term, stable moisture and water resistance.
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Extreme Temperature Range & Superior Weather Resistance
Continuous operating temperature range from -60℃ to 200℃, with higher short-term tolerance. The silicone material offers excellent resistance to natural aging, UV radiation, ozone, and salt spray corrosion, ensuring long-term stability in extreme conditions like frigid zones, humidity, coastal areas, and industrial pollution.
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High Insulation Reliability & Mechanical Protection
The material provides high insulation resistance and dielectric strength, suitable for power cable systems up to 35KV. It also features excellent tear resistance and puncture resistance; a small cut on the surface will not propagate easily, offering reliable mechanical protection.
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Adaptable Shrink Ratio
With an expansion ratio up to approximately 4:1, a single tube size can fit connectors within a range of outer diameters, simplifying inventory and enhancing application flexibility.
Product Specifications & Parameters
◎ Material: Specially formulated high-purity RTV-2 Silicone Rubber (Platinum cured).
◎ Standard Color: Black (other colors customizable upon request).
◎ Applicable Outer Diameter Range: Φ1mm to Φ70mm (or larger, customizable).
◎ Pre-shrink/Recovered Inner Diameter: Determined by model, various sizes available.
◎ Continuous Operating Temperature: -60℃ ~ +200℃.
◎ Hardness: 30-80 Shore A (typical ~40A).
◎ Rated Voltage: For power cable systems up to 35KV.
◎ Shrink Ratio: Up to approximately 4:1.
◎ Certifications: Complies with IEEE, IEC, GB, and other international/national standards. ROHS compliant.
Primary Application Fields
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◎ Power Transmission & Distribution Systems: Insulation and moisture sealing for terminations and joints of medium/low voltage power cables up to 35KV, especially for substations, power distribution cabinet, and outdoor overhead lines.
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◎ Communications & Network Infrastructure: Waterproof and moisture-proof sealing for communication base station connectors, CATV connectors, and fiber optic splice closures.
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◎ Rail Transit & Tunnel Engineering: Protection for cable and signal line joints in subway and high-speed rail tunnels, meeting low-smoke zero-halogen and long-term reliability requirements.
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◎ New Energy & Industrial Sectors: Cable connections in wind and solar power plants, equipment cable sealing in chemical plants, mines, and other heavily polluted, high-humidity environments.
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◎ Construction & Municipal Engineering: Insulation and protection for cable joints in building wiring, urban grid renovation, and street lighting systems.
Installation & Usage Guide
◎ Preparation: Ensure the cable joint is properly prepared, with a clean, dry, and smooth surface free of burrs. Verify the cold shrink tubing size matches the cable outer diameter.
◎ Installation Steps:
• Slide the cold shrink tubing over the cable and position it at the desired sealing location.
• Evenly pull the internal support core (or plastic strip) in the direction indicated.
• Observe the tubing shrinking uniformly from one end until it tightly encapsulates the cable joint.
• After complete shrinkage, check that both ends of the tubing are properly seated, forming uniform skirt-like seals.
Technical Parameter
| Texture of material | Silicon rubber |
| Hardness (Shore C) | 40±5° |
| Density (g/cm³) | 1.2±1 |
| Elongation at break (%) | ≥500 |
| Tensile strength (MPa) | ≥8 |
| Tear strength (KN/m) | ≥30 |
| 200% fixed extension permanent transformer (%) | ≤9.4 |
| Volume resistivity (Ω/cm) | 9×1016 |
| Density (KG/cm³) | 1.13 |
| Breakdown strength (kV/mm) | 20 kV/mm |
Product Specifications
| Withstand Voltage Level | Applicable Cable Section (mm²) | Inner Diameter A (mm) | Wall Thickness C (mm) | Expanded Inner Dia. Min. (mm) | Expanded Inner Dia. Max. (mm) |
| mm | mm | mm Min. | mm Max. | ||
| 1KV | 25–50 | 7 | 2 | 20 | 28 |
| 70–120 | 9 | 2 | 26 | 36 | |
| 150–240 | 13 | 2 | 34 | 52 | |
| 300–400 | 17 | 2 | 42 | 68 | |
| 10KV | 25–50 | 12 | 2.5 | 34 | 48 |
| 70–120 | 15 | 2.5 | 37 | 60 | |
| 150–240 | 18 | 2.5 | 42 | 72 | |
| 300–400 | 21 | 2.5 | 46 | 84 | |
| 35KV | 50–95 | 22 | 3 | 55 | 88 |
| 120–185 | 25 | 3 | 60 | 100 | |
| 240–400 | 28 | 3 | 65 | 112 | |
| 500–630 | 30 | 3 | 70 | 120 |
Note
All above data are common values only, excluding customized sizes. Special colors and packages can be made as per customization.
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Frequently Asked Questions (FAQ)
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QWhat is a cold shrink silicone rubber tubing and how does it work?
Cold shrink silicone rubber tubing is a pre-expanded sleeve supported by an internal plastic core. When the core is removed, the tubing contracts radially around the cable joint without any heat source, tools, or open flame, providing a tight, waterproof seal through its inherent elasticity and constant radial pressure.
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QWhat voltage levels is this cold shrink tubing suitable for?
Our cold shrink silicone tubing is designed for power cable systems up to 35KV, covering 1KV, 10KV, and 35KV voltage levels, with a range of inner diameters and wall thicknesses to match each voltage class.
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QWhat is the operating temperature range of this product?
The cold shrink silicone rubber tubing has a continuous operating temperature range of -60℃ to +200℃, making it suitable for use in extreme cold regions, high-temperature industrial environments, coastal areas, and other demanding conditions.
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QCan the tubing be used in explosive or confined space environments?
Yes. Because cold shrink installation requires no heating equipment or open flame, it is ideally suited for use in explosive atmospheres (such as oil and gas facilities) and confined spaces where heat-shrink methods would pose safety risks.
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QWhat is the shrink ratio and which cable diameter ranges are covered?
The expansion ratio is up to approximately 4:1, allowing a single tube size to accommodate connectors across a wide range of outer diameters from Φ1mm to Φ70mm (larger sizes available on request). This simplifies inventory management and offers broad application flexibility.
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QIs customization available for size, color, or certification requirements?
Yes. We offer customization in terms of applicable outer diameter (including sizes larger than Φ70mm), colors (standard is black), and compliance with specific international standards including IEEE, IEC, GB, and ROHS. Please contact us with your specific requirements for a tailored solution.