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China Silicone Cold Shrink Tube Factory - High-Performance Cable Insulation by Leading 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.
◎ 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
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)
What is the main advantage of cold shrink tubing over traditional heat-shrink tubing?
Cold shrink tubing requires no heat source, open flame, or special tools during installation. It is pre-expanded on a removable core, and simply pulling out the support strip causes the tubing to shrink tightly onto the cable. This makes it safer, faster, and suitable for hazardous or confined spaces where open flames are not permitted.
What voltage levels is this cold shrink silicone tubing suitable for?
This cold shrink tubing is designed for power cable systems up to 35KV, covering 1KV, 10KV, and 35KV voltage levels. It provides reliable insulation protection and moisture sealing across a range of cable cross-sections from 25mm² to 630mm², making it appropriate for low, medium, and high-voltage distribution applications.
What is the operating temperature range of this silicone cold shrink tubing?
The tubing supports a continuous operating temperature range of -60℃ to +200℃, with the ability to withstand higher temperatures for short periods. This wide range makes it suitable for extreme environments including arctic zones, tropical climates, and high-temperature industrial settings.
Can the cold shrink tubing be customized in size or color?
Yes. While the standard color is black, custom colors are available upon request. The applicable outer diameter range is Φ1mm to Φ70mm as standard, but larger sizes can also be customized. All non-standard data or special packaging requirements can be arranged based on specific customer needs.
What certifications does this cold shrink tubing comply with?
The product complies with multiple international and national standards, including IEEE, IEC, and GB standards. It is also ROHS compliant, confirming the absence of hazardous substances. This ensures the product meets the quality and safety requirements for global markets and diverse industry applications.
What industries and applications is cold shrink silicone tubing best suited for?
This tubing is widely used in power transmission and distribution systems, telecommunications and network infrastructure, rail transit and tunnel engineering, new energy sectors such as wind and solar power, as well as construction and municipal engineering. Its cold installation process, wide temperature tolerance, and superior weathering resistance make it suitable for demanding outdoor and industrial environments.