Forbon® Vulcanized Fibre Electrical Insulation Grades And Typical Values

PROPERTY THICKNESS (inches) UNIT OF MEASURE COMMERCIAL GRADE BONE GRADE PEERLESS GRADE (fishpaper)
Density 1/16 (.062) Grams/cc 1.20 1.32 1.20
Specific Volume 1/16 cu.in./lb. 23.0 21.0 23.0
Tensile Strength - MD 1/16 psi 18,000 19,000 21,000
Tensile Strength - CD 1/16 psi 9,000 9,500 10,000
Modulus of Elasticity in Tension - MD 1/16 psi x 10^5 12 12 12
Modulus of Elasticity in Tension - CD 1/16 psi x 10^5 8 8 8
Flexural Strength - MD 116 psi 26,000 28,000 29,000
Flexural Strength - CD 1/16 psi 16,000 16,000 16,000
Compressive Strength 1/16 psi 35,000 35,000 35,000
Impact Strength, Izod, Edgewise - MD 1/16 ft.-lbs./inch 2.0 1.4 2.5
Impact Strength, Izod, Edgewise - CD 1/16 notch 1.8 1.0 2.0
Hardness, Rockwell, R Scale 1/16 divisions 80 100 70
Bond Strength, ASTM D-952 1/16 psi 900 1500 900
Bursting Strength, Mullen 1/64 (.015) psi --- --- 325
Tear Strength, Elmendorf - MD 1/64 grams --- --- 550
PROPERTY THICKNESS (inches) UNIT OF MEASURE COMMERCIAL GRADE BONE GRADE PEERLESS GRADE (fishpaper)
Tear Strength, Elmendorf - CD 1/64 grams --- --- 700
Dielectric Strength, Short Time 1/64 volts/mil 230 --- 400
Dielectric Strength, Short Time 1/16 volts/mil 200 200 215
Dielectric Strength, Short Time 1/8 volts/mil 195 200 200
Arc Resistance, ASTM D-495 1/16 seconds 80 100 125
Comparative Tracking Index (UL)* .120 volts 400-599 400-599 400-599
Thermal Conductivity, 149 degrees F. --- Btu/hr/ft.□/F./ft. .168 .168 .168
Specific Heat --- Btu/lb./F. .403 .403 .403
Thermal Expansion x 10^5 - MD --- in./in./F. 1.1 1.1 1.1
Thermal Expansion x 10^5 -CD --- --- 1.7 1.7 1.7
Dimensional Change, Thickness --- % 1.00 1.00 1.00
per percent change - MD --- --- .10 .10 .10
in Moisture content - CD --- --- .25 .25 .25
Water Absorption, 24 Hours 1/16 % 66.0 55.0 63.0
Coefficient of Friction --- --- --- --- ---
Fibre on Fibre --- --- .16 .16 .16
PROPERTY THICKNESS (inches) UNIT OF MEASURE COMMERCIAL GRADE BONE GRADE PEERLESS GRADE (fishpaper)
Fibre on Smooth Cast Iron --- --- .21 .21 .21
Flammability, ASTM D-635 1/16 in./min. .5 .5 .5
Flammability, UL 94 (UL)* .028, .058, .120 --- 94HB 94HB 94HB
Heat Resistance, Continuous (UL)* --- degrees in C --- --- ---
Electrical .028, .058, .120 --- 115 115 115
Mechanical .028, .058, .120 --- 110 110 110
Hot-Wire Ignition (UL)* .028, .058 seconds 15-29 15-29 15-29
Hot-Wire Ignition (UL)* .120 seconds 60-119 60-119 60-119
High-Ampere Arc Ignition (UL)* .028, .058, .120 seconds 120+ 120+ 120+
*UL File #E48013
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