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Silicone Cold Shrink Tube
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China Professional Communication Device Silicone Cold Shrink Tube factory
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.
◎ 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
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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
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 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
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All above data are common values only, excluding customized sizes. Special colors and packages can be made as per customization.
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