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Glass Thermosets Specs

        G10, FR4 G5, G9 G7
    Units ASTM Test Method Glass cloth Reinforced Epoxy Glass cloth Reinforced Melamine Glass Cloth Reinforced Silicone
MECHANICAL Strength to Weight Ratio ksi -      
Specific Gravity @73 F - D792 1.82 1.9 1.68
Tensile Strength @73 F, (ult)/(yld) psi D638 40000 37000 23000
Tensile Modulus of Elasticity @ 73 F psi D638 - - -
Tensile Elongation at Break @ 73 F % D638 - - -
Flexural Strength @ 73 F psi D790 55000 55000 23000
Flexural Modulus of Elasticity @ 73 F psi D790 2700000 2500000 1400000
Shear Strength @ 73 F psi D732 19000 20000 17000
Compressive Strength, (% Deformation) @73 F psi D695 60000 (10) 70000 (10) 45000 (10)
Compressive Modulus of Elasticity @73 F psi D695 - - -
Hardness, Rockwell, Scale as noted @73 F - D785 M110 M120 M100
Hardness, Durometer, Shore D @73 F - D2240 - - -
Izod Impact, (Notched) @73 F ft-lb/in of notch D256 TypeA 7.0 12.0 8.5
Coefficient of Friction, (Dry vs. Steel) Dynamic - - - - -
Limiting PV, (with 4 to 1 factor of safety applied) psi-ft/min - - - -
THERMAL Coefficient of Linear Thermal Expansion @73 F in/in/F E-831 (TMA) - - -
Heat Deflection Temperature @ 264 psi F D648 - - -
Tg-Glass transition temperature, (Amorphous) F D3418 - - -
Melting Point, (VS=Vicat Softening Temp.) F D3418 - - -
Continuous Service Temperature in Air, (Max.) F - 285 285 465
Thermal Conductivity BTU-in/hr-ft2-F - - - -
ELECTRICAL Dielectric Strength, Short Term Volts/mil D149 400 350 350
Volume Resistivity ohm-cm D257 - - -
Dielectric Constant @ 10E6 Hz - D150 5.2 7.1 4.2
Dissipation Factor @ 10E6 Hz - D150 0.025 0.017 0.003
Flammability @ 3.1 mm unless noted - UL94 V-O V-O V-O
H2O Water Absorbtion, Immersion, 24 Hrs % by wt. D570(7) 0.10 0.40 0.15
Water Absorbtion, Saturation % by wt. D570(7) -

 

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