Name: Varnished Glass Cloth
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roll of varnished glass cloth class f insulation laminate for motor and transformer electrical wrapping

Flexible Insulation Laminates

Varnished Glass Cloth Insulation
Class F Rated Flexible Laminate (150°C)

Varnished Glass Cloth is a durable, Class F (150°C) insulation material made by coating woven glass fabric with a high-temperature varnish. It delivers reliable dielectric performance, mechanical strength, and resistance to moisture and solvents.

Key Features:

Thermal Class F (150°C): Suitable for high-demand electrical environments
Tear & Abrasion Resistant: Reinforced with woven glass fibre
Good Dielectric Strength: Provides dependable insulation in motors and transformers
Moisture & Solvent Resistant: Performs well in harsh and high-humidity conditions

Applications:

Coil and transformer wrapping
Slot and phase insulation in electric motors
Cable, lead, and busbar insulation
Protective wraps for sensitive electrical components

Availability:

Thicknesses: 0.13 mm and 0.25 mm
Available in 1 m × 33 m rolls or cut-to-size sheets by the square metre
Custom lengths available upon request

Pair with our electrical varnishes or high-temperature sleeving for complete insulation coverage.

Need Help Choosing?

Not sure if Varnished Glass Cloth is the right material? See Available Thicknesses, Varnished Glass Cloth vs Polyester Film Comparison and Related Insulation Materials below before requesting a quote.

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Varnished Glass Cloth Available Thicknesses

Varnished Glass Cloth is available in two standard thicknesses. Both offer Class F (150°C) thermal performance, with the thicker grade providing increased mechanical durability and abrasion resistance.

Thickness	Typical Use
0.13 mm	Coil wrapping, transformer insulation, cable wrapping and general electrical insulation applications requiring flexibility.
0.25 mm	Heavier-duty slot insulation, busbar insulation, lead protection and applications requiring increased mechanical strength.

Varnished Glass Cloth vs Polyester Film – Which Insulation Should You Choose?

Varnished Glass Cloth and Polyester Film are both widely used electrical insulation materials, but they are designed for different applications. Polyester Film offers excellent flexibility and thin-profile insulation, while Varnished Glass Cloth provides greater mechanical strength, abrasion resistance and higher temperature performance.

Feature	Varnished Glass Cloth	Polyester Film
Temperature Class	Class F (150°C)	Class B (130°C)
Construction	Woven glass fabric with insulating varnish coating	Single-layer polyester film
Mechanical Strength	Excellent	Good
Abrasion Resistance	Excellent	Moderate
Flexibility	Good	Excellent
Typical Applications	Coil wrapping, transformer insulation, busbar insulation and protective wraps	Slot liners, coil barriers, transformer insulation and component wrapping
Best Choice When	Mechanical durability and higher temperature performance are important	A thin, highly flexible insulation material is required

Looking for a thinner electrical insulation material? View our Polyester Film Insulation .

Related Flexible Insulation Materials

Compare Varnished Glass Cloth with other flexible electrical insulation materials for motor rewinding, transformer insulation and higher-temperature electrical applications.

Thin Film Alternative

Polyester Film

Mylar® electrical film for slot liners, coil barriers, transformer insulation and component wrapping.

Class F Laminate

DMD

Dacron® / Mylar® / Dacron® laminate offering Class F performance with excellent flexibility and durability.

Class H Upgrade

NMN / NPN

Nomex® / Mylar® / Nomex® laminate for Class H motors, generators and transformer insulation systems.