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GPO-3 is a mineral filled, continuous fiberglass reinforced thermoset unsaturated polyester material. Its high strength, GPO-3 a flame resistance, and low smoke generation make GPO-3 the industry standard for flame and arc resistant electrical insulation, and it is used frequently in the transportation industry – where smoke generation and toxicity are a prime concern. GPO-3 is a good choice for use in switch gears and control panels.

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Technical Information

Stock Products Properties Applications Advantages Grades

Stock Products

Sheet 1/32″ – 2″ 48″ x 96″, 144″; CTS Red, black, and white

Give us your cut-to-size dimensions. We will precision-cut GPO-3 sheet to your exact size. Additional sizes and colors available upon request.


Mechanical PropertiesUnitsASTMResults
Tensile Strength @ yield psi D638 10000
Tensile Modulus MPa D638 427000
Tensile Elongation @Break % D638 4.5
Flexural Strength MPa 16000
Flexural Modulus psi 450000
Compressive Strength psi D695 17900
IZOD Impact Strength Notched kJ.m^2 D256 0.375
Thermal PropertiesUnitsASTMResults
Coeffcient of Linear Thermal Expansion x10^-5/K C177 0.000042
Heat Deflection Temp at 264 psi °F 200
Electrical PropertiesUnitsASTMResults
Surface Resistivity @60 Hz ohms/sq D257
Volume Resistivity, 50% RH ohm-cm D250
Optical PropertiesUnitsASTMResults
3mm Transparent Clear Transmittance. Total (%) % D1003
Refractive Index % D542 1.43


  • Switch gears
  • Control panels
  • Transportation
  • Bus bar supports


  • Highly flame retardant
  • Low smoke generation
  • Meets Mil-P-24364


  • GPO-1
  • GPO-2
  • GPO Angles & Channels
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