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China Silicone Cold Shrink Tube Factory - High-Quality Cable Insulation Solutions from Trusted 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
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◎ 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
Parameter |
Value |
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 |
Wall Thickness C |
Inner Diameter Range After Expansion |
|
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.
✉️ Make a Free Consultant
❓ Frequently Asked Questions
Q
What is a cold shrink silicone rubber tube and how does it differ from heat shrink tubing?
A cold shrink silicone rubber tube is pre-expanded and held open by an internal support core. During installation, you simply remove the core and the tube shrinks tightly around the cable without any heat source. Unlike heat shrink tubing, it requires no heating equipment or open flame, making it safer, faster, and suitable for use in explosive atmospheres or confined spaces.
Q
What voltage levels is this cold shrink tubing rated for?
This cold shrink silicone rubber tubing is suitable for power cable systems up to 35KV, covering 1KV, 10KV, and 35KV withstand voltage levels. Multiple size specifications are available to match the applicable cable cross-section from 25mm² up to 630mm².
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 higher short-term tolerance. This makes it suitable for extreme environments including frigid zones, high-humidity areas, coastal regions, and heavy industrial pollution sites.
Q
Can the cold shrink tubing be customized in size or color?
Yes. The standard color is black, but other colors can be customized upon request. The applicable outer diameter range is Φ1mm to Φ70mm, and larger sizes or special packages are also available through customization. Please contact us with your specific requirements for a tailored solution.
Q
What certifications does this cold shrink silicone rubber tube comply with?
The product complies with IEEE, IEC, GB, and other international and national standards. It is also ROHS compliant, ensuring it meets environmental and safety requirements for global markets.
Q
What are the main application fields for cold shrink silicone rubber tubing?
This tubing is widely used across multiple industries including power transmission and distribution systems (up to 35KV), communications and network infrastructure (base stations, CATV, fiber optics), rail transit and tunnel engineering, new energy sectors (wind and solar power plants), chemical plants, mines, building wiring, urban grid renovation, and street lighting systems.