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Material Properties


TYPICAL COUPON PROPERTIES

Below are test results for typical coupon properties of Bedford Reinforced Plastics' structural fiberglass profiles (Standard, Fire Retardant, & Vinylester shapes). Properties are derived per the ASTM test method shown. Synthetic surfacing veil and ultraviolet inhibitors are standard.
 

Mechanical Properties ASTM Units Value
Tensile Stress, LW D-638 psi 30,000
Tensile Stress, CW D-638 psi 7,000
Tensile Modulus, LW D-638 106 psi 2.5
Tensile Modulus, CW D-638 106 psi 0.8
Compressive Stress, LW D-695 psi 30,000
Compressive Stress, CW D-695 psi 15,000
Compressive Modulus, LW D-695 106 psi 2.5
Compressive Modulus, CW D-695 106 psi 1.0
Flexural Stress, LW D-790 psi 30,000
Flexural Stress, CW D-790 psi 10,000
Flexural Modulus, LW D-790 106 psi 1.8
Flexural Modulus, CW D-790 106 psi 0.8
Modulus of Elasticity, E Full Section 106 psi 2.8
Shear Modulus ---- 106 psi 0.450
Short Beam Shear D-2344 psi 4,500
Punch Shear D-732 psi 10,000
Notched Izod Impact, LW D-256 ft-lbs/in 25
Notched Izod Impact, CW D-256 ft-lbs/in 4

 

Physical Properties ASTM Units Value
Barcol Hardness D-2583 --------- 45
24 Hour Water Absorption D-570 % max 0.45
Density D-792 lbs./in.3 .062-.070
Coefficient of Thermal Expansion, LW D-696 10-6 in/in/°C 8

 

Electrical Properties ASTM Units Value
Arc Resistance, LW D-495 seconds 120
Dielectric Strength, LW D-149 kv./in. 35
Dielectric Strength, PF D-149 volts/mil. 200
Dielectric Constant, PF D-150 @60hz 5

Fire Retardant Polyester and Fire Retardant Vinylester Structural Profiles:

Flammability Properties ASTM Units Value
Tunnel Test E-84 Flame Spread 25 max.
Flammability D-635 ---- Nonburning
UL 94 VO
NBS Smoke Chamber E-662 Smoke Density 600-700

LW = Lengthwise, CW = Crosswise, PF = Perpendicular to Laminate Face

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