Silicone Coated Fiberglass Sleeves: High-Temperature Electrical Insulation Explained
Silicone coated fiberglass sleeves are widely used in industrial and electrical applications where wires, cables, and sensitive components need protection from high heat, chemical exposure, and mechanical stress. These silicone coated fiberglass sleeves combine a strong woven fiberglass core with a durable silicone coating to deliver excellent thermal stability, electrical insulation, and flexibility.
Silicone coated fiberglass sleeves are widely used in high-temperature electrical insulation applications. By combining woven fiberglass yarns with high-temperature silicone rubber, these sleeves provide:
Thermal endurance from -10°C to +200°C
Short-term tolerance up to 260°C without cracking
Electrical insulation for voltages up to 7 kV
Mechanical strength and flexibility for motors, transformers, and industrial equipment
Chengrui Insulation supplies standard and custom sizes to meet diverse industrial requirements, including bulk orders and sample testing .
Technical Overview
Temperature Endurance
Continuous: 200°C ± 2°C for 168h, maintaining ≥50% of original voltage value
Short-term: 260°C for 6h, no cracking observed
Cold Bend Test: No cracking, ensuring mechanical flexibility under low temperature conditions
Flammability & Safety
Horizontal flame test ≤30s
VW-1 rating, providing high flame retardancy for industrial applications
Electrical Properties
Volume resistivity: 10¹¹ Ω·cm, providing excellent dielectric insulation
Individual voltage withstand (FRT series, UL1441):
FRT-15: 1500V average, 1000V individual
FRT-25: 2500V average, 1800V individual
FRT-40: 4000V average, 3000V individual
FRT-70: 7000V average, 5000V individual
Water and Chemical Resistance
Submerge water test: no stickiness, no deformation, no softening
Resistant to moisture, oils, and common industrial chemicals, suitable for harsh environments
Mechanical Properties
Strong tensile strength and flexibility
Easy installation over wire bundles and complex geometries
Maintains integrity after bending and high-temperature exposure
Typical Applications
Motor insulation – protecting winding wires from heat and mechanical wear
Transformer coil insulation – ensuring dielectric reliability under high temperature
Cable harness protection – thermal and mechanical protection for industrial wiring
Switchgear and electrical panels – insulation in compact or high-heat environments
Industrial equipment wiring – high-temperature, flame-resistant sleeving
Why Buyers Choose Chengrui Insulation
Customizable diameters and lengths for various wire and cable sizes
High-temperature performance verified by technical tests
UL1441-rated voltage withstand for electrical safety
Flame retardant and moisture-resistant for industrial compliance
Supplier experience in motors, transformers, and industrial applications
These features make Chengrui silicone coated fiberglass sleeves ideal for engineers and procurement specialists who require reliable high-temperature insulation solutions.
Silicone coated fiberglass sleeves are a high-performance solution for high-temperature insulation, electrical safety, and mechanical protection. Chengrui Insulation provides UL-tested, flame-retardant, and water-resistant sleeves suitable for motors, transformers, cable harnesses, and industrial electrical equipment.
For custom sizes, bulk supply, and technical support, contact Chengrui Insulation today.
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