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China Silicone Cold Shrink Tube Factory - High-Quality Cable Protection Suppliers for Harsh Environments
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
- ◎ 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.
- ◎ Communications & Network Infrastructure: Waterproof and moisture-proof sealing for communication base station connectors, CATV connectors, and fiber optic splice closures.
- ◎ 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.
- ◎ 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.
- ◎ 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) |
20KV/mm |
Product Specifications
Withstand voltage level |
Applicable cable section (mm²) |
Inner diameter A |
Wall thickness C |
Inner diameter range after expansion |
|
mm |
mm |
mm |
mm |
||
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
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Q What is cold shrink tubing and how does it differ from heat shrink tubing?Cold shrink tubing is pre-expanded silicone rubber tubing supported by an internal plastic core. Unlike heat shrink tubing, it requires no heating equipment or open flame — simply remove the core and the tubing contracts by itself. This makes it safer, faster, and ideal for use in explosive atmospheres or confined spaces.
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Q What voltage levels is this cold shrink silicone tubing suitable for?This cold shrink tubing is suitable for power cable systems up to 35KV, covering 1KV, 10KV, and 35KV withstand voltage levels. It is widely used for cable terminations and joints in medium and low voltage power distribution systems.
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Q What is the operating temperature range of this silicone cold shrink tubing?The tubing has a continuous operating temperature range of -60℃ to +200℃, with even higher short-term tolerance. This makes it suitable for extreme environments including arctic cold zones, high-temperature industrial settings, and outdoor installations exposed to direct sunlight.
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Q Can this tubing be customized in size or color?Yes. While the standard color is black and the applicable outer diameter range is Φ1mm to Φ70mm, both custom sizes (larger diameters or special dimensions) and custom colors are available upon request. Please contact us with your specific requirements for a tailored solution.
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Q What certifications does this cold shrink tubing comply with?This product complies with major international and national standards including IEEE, IEC, and GB standards. It is also ROHS compliant, confirming it meets environmental and safety requirements for use in global markets.
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Q What industries and environments is this product best suited for?This cold shrink silicone tubing is ideal for a wide range of industries including power transmission and distribution, telecommunications, rail transit and tunnel engineering, new energy (wind and solar), chemical and mining industries, and construction and municipal engineering. Its superior weather resistance, UV resistance, and waterproof sealing performance make it reliable in harsh outdoor and industrial environments.