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China High-Temperature Silicone Fiberglass Sleeves - Reliable Insulation from Leading Suppliers and Factory
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.
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).
Primary Application Fields
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◎ 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).
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◎ Home Appliances & Electronics: Used for internal wiring bundling, insulation, and heat resistance in electric heating equipment, televisions, air conditioners, microwave ovens, etc.
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◎ 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, as well as internal wiring in various instruments.
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◎ 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.
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◎ Automotive & Rail Transit: Engine compartment wiring harnesses, battery pack connections, and other areas requiring high-temperature and flame-retardant protection.
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◎ Aerospace & Military Equipment: Insulation protection for electrical systems with extremely high requirements for weight, temperature resistance, and reliability.
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 |
Installation & Usage Guide
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◎ 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.
Product Specifications
| Size | Inside Diameter (mm) | Min. Wall Thickness (T) (mm) | Packing Length (M/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 |
Note
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Standard color is White, other colors and special sizes can be made as per customization.
Frequently Asked Questions
What is the maximum operating temperature of fiberglass sleeves?
The maximum operating temperature varies by product type. Silicone rubber fiberglass sleeves can operate continuously from -65°C to 260°C. Silicone resin fiberglass sleeves support up to 200°C continuously with short-term tolerance of 260°C. PVC fiberglass sleeves are rated up to 105°C, while certain specialized fiber casings can withstand continuous temperatures up to 538°C.
What voltage ratings are available for fiberglass insulation sleeves?
Voltage withstand ratings range from 1.2KV to 7KV depending on the product type and wall thickness specification. For example, FLT-15 types are rated at 1200–1500V average, FLT-25 at 2500V, FLT-40 at 4000V, and FLT-70 at 7000V, all tested under UL1441 conditions.
Are fiberglass sleeves flame retardant and safe to use in fire-sensitive environments?
Yes. Most fiberglass sleeves feature self-extinguishing properties and comply with the VW-1 flame retardant standard. Silicone rubber fiberglass sleeves are also classified as fire-resisting sleeves and serve as a safe, eco-friendly alternative to hazardous materials such as asbestos.
What diameter sizes and colors are available?
Standard diameters range from Φ0.5mm to Φ12mm (as listed in the specification table), with common sizes extending up to Φ40mm and custom sizes available upon request. Available colors include white, black, red, blue, white with green stripe, white with red stripe, and white with blue stripe. Standard color is white; other colors can be customized.
What certifications do these fiberglass sleeves comply with?
The products comply with ROHS and SGS environmental and safety certifications, as well as relevant national and industry standards such as Type 2715-Ⅲ. Flame retardancy meets VW-1 standards, and electrical testing is conducted per UL1441 conditions.
How should fiberglass sleeves be installed and stored?
Simply slide the sleeve over the wire or harness and cut to the required length. The flexible braided structure allows easy routing through complex wiring paths. For storage, keep in a cool, dry environment away from direct sunlight to prevent premature material aging. Avoid prolonged exposure to heat sources exceeding the product's rated temperature.