347 Epoxy Glass Laminate Sheet | High-Strength 347 Insulation Board Manufacturer

347 High-Strength Epoxy Glass Cloth Laminate Sheet

347 is a high-strength epoxy glass cloth laminate developed for structural and high-stress insulation, delivering exceptional mechanical strength alongside reliable electrical insulation.

Standard / Grade

347 high-strength epoxy glass

Base Material

E-glass woven cloth + epoxy resin

Colour

Yellow / green

Density

≈ 1.85–1.95 g/cm³

Thickness Range

0.5 mm – 60 mm

Sheet Size

1020×1220 mm · 1220×2440 mm

Operating Temp.

Class F (155 °C)

Dielectric Strength

≥ 15 kV/mm (perpendicular)

Flexural Strength

≥ 400 MPa

Water Absorption

≤ 0.10%

Key Advantages

Why Choose Our 347

💪

Exceptional Strength

Flexural strength ≥400 MPa for the most demanding structural insulating parts.

⚡

Reliable Insulation

High dielectric strength for high-voltage and high-stress applications.

🌡️

Heat Resistant

Class F service up to 155 °C without loss of strength.

📏

Dimensionally Stable

Holds tight tolerances during heavy machining and under load.

Description

347 High-Strength Epoxy Glass Laminate

347 high-strength epoxy glass cloth laminate is engineered for applications where maximum mechanical strength must be combined with dependable electrical insulation. It is hot-pressed from epoxy-impregnated woven glass cloth into a dense, rigid board.

With flexural strength of at least 400 MPa — among the highest in the epoxy laminate family — and dielectric strength ≥15 kV/mm, 347 excels in structural insulators, generator wedges and high-stress supports. Class F heat resistance and low water absorption ensure stable performance under harsh conditions.

We supply 347 from 0.5 mm to 60 mm thick as sheets or CNC-machined parts, with factory-direct export to the USA, Mexico, Brazil and Europe.

Applications

Typical Uses

Structural Insulators

Generator Wedges

High-Stress Supports

Switchgear

Standoff Insulators

Bus Bar Supports

Machined Parts

Heavy Electrical Equipment

FAQ

Frequently Asked Questions

Why choose 347 over standard epoxy laminate?

347 offers higher mechanical strength (flexural strength ≥400 MPa), making it ideal for structural and high-stress insulation where standard grades are insufficient.

What is 347 used for?

It is used for structural insulators, generator wedges, high-stress supports, switchgear and heavy electrical equipment.

What is the temperature rating?

347 is Class F rated for continuous service up to about 155 °C.

Can 347 be machined to finished parts?

Yes, we CNC cut, drill and mill 347 into finished insulation components to your drawing.

Do you export 347 laminate?

We export 347 worldwide including the USA, Mexico, Brazil and Europe, with free samples available.

Order 347 Direct From The Factory

Get a factory-direct quote, free sample and CNC cutting to your exact dimensions within 24 hours.

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