This GPO-3 is a fiberglass reinforced thermoset polyester electrical grade sheet. This composite has an excellent combination of high strength, flame resistance and low smoke generation. This makes it ideal as a flame arc/track resistant electrical insulation.


This composite is ideal for flame arc/track resistant electrical insulation such as insulators, used as bus bar supports, transformer parts and switchgear insulators.


Physical properties

Specific Gravity (ASTM D-792) 1.81
Tensile strength (ASTM D-638) Psi 8000
Compressive Strength (ASTM D-695) Psi 33 100
Flexural Strength (ASTM D-790) Psi 22 100
IZOD Impact strength (notched) (ASTM D-256) 8.9
Water absorption (ASTM D-570) % 0.4

Electrical properties

Electrical strength ( ASTM D-149) Vpm 450
Arc Resistance (ASTM D-495) Sec. 180

Thermal Properties

UL Subject 94 (0.094" & Thicker) V0
UL Temperature Temperature Index (UL 746B)
Electrical 130 °C (266°F)
Mechanical 160 °C (320°F)
Coefficient of Thermal Expansion (ASTM D-696) in/in/°CX10-5 2
Thermal Conductivity (ASTM C-177) BTU/HR/Ft²/In/°F 1.9
N.B. The information, details and values indicated are to the best of our knowledge. We recommend to conduct tests according to local conditions. The data is subject to some variations without notice.