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High-Temperature Insulating Silicone Fiberglass Sleeve from China Factory - Reliable Suppliers for Overhead Line Protection
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Product Features & Core Advantages
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◎ Excellent High-Temperature Resistance
Benefiting from the stability of the fiberglass substrate, the products offer a wide operating temperature range. For instance, silicone rubber fiberglass sleeve can be used continuously from -65°C to 260°C while maintaining flexibility. Silicone resin fiberglass sleeve has a continuous operating temperature of up to 200°C, with short-term tolerance of 260°C. PVC fiberglass sleeve withstands temperatures up to 105°C. Some fiber casings are suitable for continuous high-temperature operation at 538°C.
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◎ Superior Electrical Insulation
The products possess strong insulating capabilities, suitable for high-voltage environments. For example, silicone resin fiberglass sleeve has voltage withstand ratings from 1200V to 7000V, with some products rated at 1.5KV, 4KV, or higher. The room temperature breakdown voltage for PVC fiberglass sleeve is 2000V. Their dielectric properties, voltage endurance, arc resistance, and corona resistance are excellent, making them ideal electrical insulation materials.
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◎ Reliable Flame Retardancy & Fire Safety
Most products feature good self-extinguishing properties, quenching rapidly upon removal from a flame source, and comply with flame retardant standards like VW-1. Products like silicone rubber fiberglass sleeve are also known as fire-resisting sleeves and serve as safe, eco-friendly alternatives to hazardous materials like asbestos.
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◎ Good Mechanical & Chemical Protection
The braided structure provides good flexibility and bend adaptability, facilitating wiring in complex spaces. Additionally, the products offer tear resistance, abrasion resistance, and provide a degree of water, oil, ozone, and chemical stability, protecting internal cables from mechanical damage and chemical corrosion.
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◎ Diverse Specifications & Certifications
The product diameter range is extensive, commonly from Φ0.8mm to Φ40mm, with special models up to Φ35.0mm or larger to meet different wire gauge needs. A variety of colors are available, such as white, black, red, blue, etc. Products typically comply with environmental and safety certifications like SGS and ROHS.
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Product Specifications & Parameters
◎ Base Material: High-purity alkali-free braided fiberglass tube.
◎ Coating Material: PVC resin, silicone resin, silicone rubber, etc.
◎ Standard Colors: White, black, red, blue, white with green stripe, white with red stripe, white with blue stripe, etc. (depending on type).
◎ Diameter Range: Φ0.8mm ~ Φ40mm (common), special sizes can be made customization.
◎ Continuous Operating Temperature:
◎ PVC Fiberglass Sleeve: ~105°C
◎ Silicone Resin Fiberglass Sleeve: ~200°C
◎ Silicone Rubber Fiberglass Sleeve: -65°C ~ +260°C
◎ General Fiber Sleeve: -60°C ~ +200°C (some models withstand higher temperatures)
◎ Voltage Withstanding Rating: Varies from 1.2KV to 7KV depending on product type and specification.
◎ Flame Retardant Standard: Complies with standards such as VW-1.
◎ Certifications: ROHS, SGS, compliant with relevant national or industry standards (e.g., Type 2715-Ⅲ).
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Primary Application Fields
Motor & Electrical Appliance Insulation
Widely used for wire insulation and end winding protection in various motor, generator, and transformer windings (e.g., Class H, Class N).
Home Appliances & Electronics
Used for internal wiring bundling, insulation, and heat resistance in electric heating equipment, televisions, air conditioners, microwave ovens, etc.
Industrial Equipment & Instruments
Suitable for cable protection in high-temperature environments like electric furnaces, ovens, and induction heating equipment in metallurgy, chemical, and mining industries.
Special Lighting & Electric Heating Products
Used for external insulation and protection of high-temperature lamps (e.g., halogen, metal halide), heating tubes, and heating elements.
Automotive & Rail Transit
Engine compartment wiring harnesses, battery pack connections, and other areas requiring high-temperature and flame-retardant protection.
Aerospace & Military Equipment
Insulation protection for electrical systems with extremely high requirements for weight, temperature resistance, and reliability.
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Characteristics
| Item | Silicone fiberglass sleeve |
| Temperature Endurance（℃） | -10℃ ~ +200℃ |
| Temperature Endurance | 200℃±2℃, 168h ≥1/2 |
| Aging Test | 260℃，6h，No Cracking |
| Cold Bend | No Cracking |
| Off-self Time (S) | 10S |
| Horizontal Flame Test | ≤30S |
| Flammability | VW-1 |
| Volume Resistivity (Ω.cm) | 1011 |
| Submerge Water Test | Not sticky, not deformed, not softened |
| Type | Testing Condition | Average Voltage (V) | Individual Value (V) |
| FLT-15 | UL1441 | 1200 | 800 |
| FLT-15 | UL1441 | 1500 | 1000 |
| FLT-25 | UL1441 | 2500 | 1800 |
| FLT-40 | UL1441 | 4000 | 3000 |
| FLT-70 | UL1441 | 7000 | 5000 |
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Installation & Usage Guide
◎ Selection Guide: Choose the appropriate coating type and size based on the maximum operating temperature, required insulation level (voltage rating), harness diameter, and flame retardancy requirements of the actual application environment.
◎ Installation Method: Slide the sleeving directly over the wire or harness to be protected. It can be cut to specific lengths as needed. Its flexibility allows easy bending to follow wiring paths.
◎ Precautions:
• Although heat resistant, avoid prolonged direct contact with open flames or extreme heat sources exceeding the product's rated temperature.
• For applications requiring embedding in walls or concrete, note that wire replacement during maintenance might be more difficult compared to rigid conduit, and concrete curing may cause slight deformation of the sleeve.
• Store in a cool, dry place away from prolonged direct sunlight to slow material aging.
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Product Specifications
| Size | (mm) Inside Diameter | Min. Wall Thickness (T) (mm) | (M/Tray) Packing Length (Meter/Roll) | |||
| 1200/1500V | 2500V | 4000V | 7000V | |||
| Φ0.5 | 0.5+0.20/-0 | 0.20 | 0.20 | 0.28 | 0.35 | 100 |
| Φ1.0 | 1.0+0.20/-0 | 0.20 | 0.20 | 0.28 | 0.35 | 100 |
| Φ1.5 | 1.5+0.20/-0 | 0.20 | 0.20 | 0.28 | 0.35 | 100 |
| Φ2.0 | 2.0+0.20/-0 | 0.22 | 0.22 | 0.30 | 0.38 | 100 |
| Φ2.5 | 2.5+0.20/-0 | 0.22 | 0.22 | 0.30 | 0.38 | 100 |
| Φ3.0 | 3.0+0.25/-0 | 0.23 | 0.23 | 0.35 | 0.45 | 100 |
| Φ3.5 | 3.5+0.23/-0 | 0.23 | 0.23 | 0.35 | 0.45 | 100 |
| Φ4.0 | 4.0+0.25/-0 | 0.25 | 0.25 | 0.38 | 0.45 | 100 |
| Φ4.5 | 4.5+0.25/-0 | 0.28 | 0.30 | 0.40 | 0.48 | 100 |
| Φ5.0 | 5.0+0.35/-0 | 0.33 | 0.33 | 0.43 | 0.50 | 100 |
| Φ6.0 | 6.0+0.35/-0 | 0.35 | 0.36 | 0.45 | 0.52 | 100 |
| Φ7.0 | 7.0+0.50/-0 | 0.36 | 0.40 | 0.46 | 0.54 | 100 |
| Φ8.0 | 8.0+0.50/-0 | 0.38 | 0.43 | 0.49 | 0.56 | 50 |
| Φ9.0 | 9.0+0.50/-0 | 0.40 | 0.44 | 0.50 | 0.58 | 50 |
| Φ10.0 | 10+0.70/-0 | 0.43 | 0.46 | 0.53 | 0.62 | 50 |
| Φ12.0 | 12+0.70/-0 | 0.43 | 0.46 | 0.53 | 0.62 | 50 |
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Note
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1. Standard color is White, other colors and special sizes can be made as per customization.
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Frequently Asked Questions (FAQ)
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1What is the maximum operating temperature of silicone rubber fiberglass sleeve?Silicone rubber fiberglass sleeve can be used continuously in temperatures ranging from -65°C to 260°C while maintaining excellent flexibility. This makes it one of the most versatile high-temperature resistant sleeve solutions available.
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2What voltage ratings are available for fiberglass insulation sleeves?Voltage withstanding ratings vary by product type and specification, ranging from 1.2KV up to 7KV. For example, FLT-15 sleeves provide average voltages of 1200–1500V, while FLT-70 sleeves can withstand an average voltage of 7000V under UL1441 testing conditions.
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3Do fiberglass sleeves meet flame retardant standards?Yes. Most fiberglass insulation sleeve products comply with the VW-1 flame retardant standard. They exhibit good self-extinguishing properties, quenching rapidly once removed from a flame source. They are also ROHS and SGS certified.
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4What diameter sizes are available, and can custom sizes be made?Standard diameter sizes range from Φ0.5mm to Φ12.0mm (and up to Φ40mm in common production), covering most wire gauge requirements. Custom sizes beyond these ranges are available upon request to suit special application needs.
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5What colors are available for fiberglass insulation sleeves?The standard color is White. Other available colors include black, red, blue, white with green stripe, white with red stripe, and white with blue stripe, depending on the product type. Custom colors can also be produced upon request.
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6What are the main application fields for fiberglass insulation sleeves?Fiberglass insulation sleeves are widely used in motors, generators, transformers, home appliances, industrial heating equipment, special lighting products, automotive wiring harnesses, and aerospace or military electrical systems — anywhere high-temperature resistance, electrical insulation, and flame retardancy are required.