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
Please send e-mail to:
allen@clearlight.com
if you would like more information