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G-15 NEMA Epoxy Woven Fiberglass Sheet

G-15 NEMA Epoxy Woven Fiberglass Sheet is a high-temperature thermoset composite that blends woven glass cloth with a heat-stable resin system to deliver sustained mechanical strength and electrical insulation to ~240°C while resisting moisture and chemicals.IEC equivalent is PIGC 301.

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Product Details

G-15 is an engineered epoxy/glass laminate built for parts that must keep shape, strength and dielectric performance under prolonged heat. Its tightly woven fiberglass reinforcement and specialty thermoset binder give the sheet exceptional flexural and impact resistance, low outgassing for controlled environments, and stable dimensional and creep behavior where engineered thermoplastics would soften or require expensive redesign. Available in practical sheet sizes and a wide thickness range, G-15 is made to be machined, formed and assembled into robust insulating and structural components.

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Product Parameters

Glass transition (Tg, DMA)

~240°C (464°F)

Recommended continuous design temperature

~225°C

Flexural strength (0.35", lengthwise)

>78,000 psi (>538 MPa)

Dielectric strength

>450 V/mil

dielectric breakdown (0.125")

Thickness availability

0.016" – 3.500" (0.41 mm – 88.90 mm)

Specific gravity / density

~1.81

Product Advantages

High retained performance at temperature

maintains substantial flexural and impact strength well above typical NEMA grades, enabling reliable structural support in continuous high-heat service.

Low contamination footprint

outgassing characteristics and chemical resistance suit controlled or enclosed assemblies (useful for sensitive electrical and aerospace hardware).

Wide fabrication flexibility

broad thickness range and compatibility with standard machining/fabrication processes let designers replace pricier thermoplastics without changing manufacturing flows.

Product Applications

High-temperature motor end shields and generator mounting plates

precision-machined support pieces that must carry mechanical loads while insulating windings and terminals at sustained elevated temperatures.
Internal barrier and terminal board assemblies in oil-cooled or dry-type transformers and switchgear

insulating spacers and barrier panels that resist thermal creep, oil or chemical exposure, and maintain dielectric clearance.
Power module carrier plates and insulating spacers for EV inverters and traction converters

thin, dimensionally stable substrates that separate busbars, heat spreaders and housings while withstanding repeated thermal cycling.

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