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Product Introduction
This insulation sleeve is manufactured from alkali-free glass fiber yarn woven into a tubular structure and coated with silicone rubber at high temperatures. The sleeve provides insulation protection, water resistance, moisture prevention, heat resistance, flexibility, mechanical strength, and anti-aging and corrosion resistance. The sleeve is widely used for protection of electrical equipment and lines. It serves applications in industrial, power generation, and transportation sectors due to its electrical insulation performance, high-temperature resistance, weather resistance, and mechanical strength.
Core Advantages
Electrical Insulation Protection
Silicone rubber coating provides dielectric insulation, preventing current leakage and protecting electrical lines from short circuits.
High-Temperature Resistance
Continuous operating temperature range of -50°C to +260°C, suitable for high-temperature industrial environments.
Waterproof and Moisture-Proof
Silicone rubber coating creates a moisture barrier, preventing water ingress and protecting components in humid environments.
Flexibility and Mechanical Strength
The woven glass fiber construction provides tensile strength while maintaining flexibility for routing around corners and fittings.
Anti-Aging and Corrosion Resistance
UV-stabilized silicone coating resists ozone, UV radiation, and chemical degradation, extending service life in outdoor and industrial environments.
Weather Resistance
The sleeve maintains performance across temperature extremes and environmental conditions including rain, humidity, and UV exposure.
Product Features
Base material Alkali-free glass fiber (E-glass) yarns woven into a tubular braid. Filament diameter: 7-9 micrometers. Tensile strength: >1000 N per 25mm width.
Coating material Silicone rubber applied via high-temperature dip coating process. Coating thickness: 0.5-1.0mm. Provides electrical and moisture barrier.
Dielectric strength 10-15 kV/mm (ASTM D149). Provides electrical insulation for low and medium voltage applications.
Temperature rating Continuous: -50°C to +260°C. Intermittent: up to 350°C for short durations.
Flame resistance UL VW-1 rated, self-extinguishing within 5 seconds. Does not melt or drip.
Available inner diameters 4mm to 150mm. Standard lengths: 10m, 20m, 50m rolls. Custom diameters available.
Technical Specifications
| Parameter | Specification |
|---|---|
| Continuous operating temperature | -50°C to +260°C |
| Intermittent peak temperature | Up to 350°C (short duration) |
| Dielectric strength | 10-15 kV/mm |
| Volume resistivity | >1×10¹⁴ Ω·cm |
| Coating material | Silicone rubber, iron oxide red color |
| Tensile strength | >1000 N per 25mm width (glass fiber core) |
Application Scenarios
Industrial electrical equipment protection
Power generation cable insulation
Transportation vehicle wiring harnesses
Motor lead wire insulation
Transformer and switchgear cable bundling
High-temperature oven wiring protection
HVAC equipment internal wiring
Marine and offshore electrical systems
This insulation sleeve is suitable for industrial electrical equipment where cables and wires require protection from heat, moisture, and mechanical abrasion. Power generation facilities use the sleeve for cable bundling in switchgear, control panels, and generator connections. Transportation applications include wiring harness protection in railway rolling stock, commercial vehicles, and marine vessels. The sleeve protects motor lead wires in industrial motors, pumps, and compressors where ambient temperatures may be elevated. In high-temperature environments such as ovens, furnaces, and heat treatment equipment, the sleeve maintains insulation integrity. The silicone coating provides weather resistance for outdoor installations including solar power systems, wind turbines, and substation equipment.
Common Questions and Solutions
What is the difference between this insulation sleeve and standard heat shrink tubing?
This silicone-coated glass fiber sleeve is flexible and can be installed over existing wiring without disconnection. It provides continuous high-temperature resistance up to 260°C, whereas heat shrink tubing typically degrades above 125°C. The sleeve is also removable and reusable, while heat shrink is permanent. For applications requiring high-temperature protection and flexible installation, this sleeve is preferred.
Does the sleeve provide electrical insulation for live conductors?
The sleeve provides supplemental electrical insulation with dielectric strength of 10-15 kV/mm. However, it is designed as a protective cover for cables that already have primary insulation. For bare conductors or applications requiring certified electrical insulation, use products specifically rated for that purpose. Consult electrical safety standards for your specific application.
How does the sleeve resist moisture and water ingress?
The silicone rubber coating is inherently hydrophobic, causing water to bead on the surface. The coating is continuous and pinhole-free, preventing moisture from reaching the glass fiber core. For applications involving immersion, the sleeve should be secured with moisture-resistant sealing at the ends using silicone sealant or heat shrink end caps.
What is the shelf life of the insulation sleeve?
When stored in a cool, dry environment away from direct UV exposure, the silicone-coated sleeve has a shelf life of 5 years. The silicone rubber may stiffen slightly over time but remains functional. For critical applications, replace sleeves after 10 years of service or if surface cracking is observed.
Can the sleeve be used in outdoor or UV-exposed environments?
Yes. The silicone rubber coating is UV-stabilized and resistant to ozone and weathering. The sleeve maintains flexibility and mechanical properties after prolonged outdoor exposure. For continuous outdoor use, periodic inspection is recommended as UV exposure may cause surface chalking over extended periods (5+ years).
How should the sleeve be cut to length?
Cut the sleeve using sharp scissors or a utility knife. For clean cuts, use a sharp blade and rotate the sleeve while cutting to avoid crushing the glass fiber core. After cutting, the silicone coating may adhere to the blade; clean with solvent if necessary. Seal cut ends with high-temperature silicone sealant to prevent moisture ingress into the glass fiber core.
Installation and Handling Considerations
Before installation, inspect the sleeve for any damage to the silicone coating. Do not use sleeves with cuts, punctures, or areas where the glass fiber is exposed.
Select a sleeve with inner diameter 10-20% larger than the cable or wire bundle to allow for easy sliding without excessive compression that could damage the silicone coating.
When installing over long cable runs, use a pulling cord or fish tape to guide the sleeve. Lubricate with talcum powder or silicone-based lubricant if resistance is encountered. Do not use petroleum-based lubricants as they may degrade the silicone coating.
Secure the sleeve using nylon cable ties for low-temperature applications (below 85°C) or stainless steel tie wraps for high-temperature applications. Do not overtighten as this may cut through the silicone coating.
For applications requiring waterproofing at the ends, apply high-temperature silicone sealant at the interface between the sleeve and the cable, or use heat shrink tubing over the sleeve ends rated for high-temperature service.
Inspect the sleeve periodically for signs of silicone degradation including cracking, chalking, or loss of flexibility. Replace sleeves that show significant deterioration. For electrical insulation applications, perform dielectric testing at regular intervals according to your facility's maintenance schedule.
