PU Coated Fiberglass Sleeves – F Class

PU Coated Fiberglass Sleeves – F Class Electrical Insulation Sleeving

PU Coated Fiberglass Sleeves – F Class are high-quality electrical insulation sleeves designed for reliable performance in Class F (155 °C) insulation systems. These sleeves are manufactured from non-alkali braided fiberglass yarn and uniformly coated with polyurethane (PU) resin, followed by high-temperature curing to enhance mechanical strength and insulation performance.

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PU Coated Fiberglass Sleeves – F Class Electrical Insulation Sleeving

The fiberglass core provides excellent dielectric and mechanical properties, while the PU coating improves flame resistance, oil resistance, chemical resistance, and fray resistance. These sleeves show excellent compatibility with Class F impregnation varnishes, ensuring long-term insulation reliability in demanding electrical environments.

PU coated fiberglass sleeves are widely used for internal wiring of rotating and static machines, including F-Class motors, alternators, generators, transformers, cable assemblies, household electrical appliances, electrical heating devices, and special lighting equipment. Manufactured in accordance with European and American standards, they offer excellent adaptability and consistency across a wide range of electrical applications.

Product Details

Product Name

Insulating PU Fiberglass Sleeve

Insulation Class

Class F

Thermal Rating

–30 °C to +155 °C

Base Material

Non-alkali braided fiberglass

Coating Material

Polyurethane (PU) Resin

Size Range

Available in multiple inner diameters

Color Options

Natural, Red, Black, Grey (others on request)

Typical Applications

Motors, generators, transformers, wiring, cable assemblies

End Use Industries

Electrical equipment, appliances, lighting, machinery

Technical Specifications – PU Varnished Fiberglass Sleeving (Class F)

Electrical insulation PU fiberglass sleeving is braided from non-alkali fiberglass yarns, coated with polyurethane resin, and cured at high temperature. It offers excellent flame resistance, heat resistance, oil resistance, chemical resistance, good mechanical strength, and compatibility with Class F impregnation varnishes.

General Information
Product Name	Insulating PU Fiberglass Sleeve
Material	Polyurethane Coated Fiberglass Sleeving
Diameter Range	0.5 mm to 25 mm
Available Colours	White, Black, Yellow, Blue, Red, etc.
Length / Roll	0.5–3 mm: 200 m 4–8 mm: 100 m 10–14 mm: 50 m 16–25 mm: 25 m

Electrical Properties
Dielectric Strength	2.5 kV / 4 kV / 7 kV / 10 kV
Rated Voltage	300 V
Electrical Performance	Excellent insulation performance and varnish compatibility

Thermal & Mechanical Properties
Temperature Class	Class F
Continuous Working Temperature	−30°C to +155°C
Heat Resistance Test	170°C × 3 hours, no cracking on surface
Chemical Resistance	Excellent oil resistance and benzene resistance
Mechanical Properties	Good abrasion resistance, fray resistance, and flexibility

Standards & Applications
Manufacturing Standard	Manufactured based on European & American standards
Applications	Internal wiring of rotating and static machines, Class F motors, alternators, generators, transformers, Cable assemblies, household electrical appliances, Electrical heating devices and special lamps