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Vulcanized Fibre, Commercial Grade, is a hard, durable, chemically pure cellulose product that contains no resin or bonding agents. Vulcanized Fibre is manufactured in Rolls, Coils, Sheets, Tubes and Rods. The commercial grade of Vulcanized Fibre is sometimes referred to as "Fibre". Vulcanized Fibre can be used for washers, insulating plates, switch and appliance insulation, electric motor insulation, gaskets, automobile parts, luggage, patterns, and many other applications.

Its properties include:
  • High Mechanical Strength
  • Excellent Resistance to Heat and Cold, superior to most plastics
  • Light Weight, Half the weight of Aluminum
  • Excellent Electrical Properties
  • Good Arc Resistance
  • Excellent Tear Resistance
  • Can be Machined with Standard Tools
  • Available in Rolls and Coils for easy automatic punching

    UL File No.: E55656 Material Designation HB-77
    ASTM Spec: ASTM D-710, Commercial
    Military Spec: Mil-F-1148, C-H; Mil-F-I 3526, Red Sheet
    NEMA Grade: Vulcanized Fibre, Commercial

    High mechanical & dielectric strength. Good shock absorting & wear resisting qualities. Excellent punching, forming, & turning characteristics. Semi-hard & has a good surface finish.

    *$15.00 small order charge applies to line items less than 200#'s

Unit of Measure


N/A 0.040 in

Thickness Range

N/A 0.036" to 0.044" in


N/A Coil


N/A Red


N/A 28"

Weight per 1M Ft.

N/A 666.666 lbs

Price/Pound 13-49 lbs.*

N/A $7.24

Price/Pound 50-99 lbs.*

N/A $6.52

Price/Pound 100-199 lbs.*

N/A $5.79

Price/Pound 200-499 lbs.

N/A $5.07

Price/Pound 500-999 lbs.

N/A $4.71

Price/Pound 1000+ lbs.

N/A $4.35

Flammability, UL94

N/A 94HB


N/A 1.20 gm/cc

Specific Volume

N/A 23.0 in³/lb

Tensile Strength (MD)

N/A 21000 psi

Tensile Strength (CD)

N/A 10000 psi

Modulus of Elasticity in Flexural x 10^5 (MD)

N/A 10

Modulus of Elasticity in Flexural x 10^5 (CD)

N/A 7

Modulus of Elasticity in Tension x 10^5 (MD)

N/A 12

Modulus of Elasticity in Tension x 10^5 (CD)

N/A 8

Flexural Strength (MD)

N/A 29000 psi

Flexural Strength (CD)

N/A 16000 psi

Compressive Strength

N/A 35000 psi

Impact Strength (MD)

N/A 2.5 ft.lbs/in

Impact Strength (CD)

N/A 2.0 ft.lbs/in

Rockwell Hardness (R Scale)

N/A 70 divisions

Bond Strength

N/A 900 psi

Bursting Strength

N/A 325 psi

Tear Strength (MD)

N/A 550 gm

Tear Strength (CD)

N/A 700 gm

Dielectric Strength

N/A 400 Volts/mil

Dielectric Strength

N/A 215 Volts/mil

Dielectric Strength

N/A 200 Volts/mil

Arc Resistance

N/A 125 sec

Comparative Tracking Index

N/A 400 - 599 V

Thermal Conductivity at 149ºF

N/A 0.168 Btu/hr/ft²/ºF/ft

Specific Heat

N/A 0.403 Btu/lb/ºF

Thermal Expansion x10^5 (MD)

N/A 1.1 in/in/ºF

Thermal Expansion x10^5 (CD)

N/A 1.7 in/in/ºF

Dimensional Change (Thickness)

N/A 1.00 %

Dimensional Change (Per Percent Change MD)

N/A 0.10 %

Dimensional Change (In Moisture Content CD)

N/A 0.25

Water Absorption, 24hrs

N/A 63 %

Coefficient of Friction (Fibre on Fibre)

N/A 0.16

Coefficient of Friction (Fibre on Smooth Cast Iron)

N/A 0.21


N/A 0.5 in/min


N/A 115 ºC


N/A 110 ºC

Hot-Wire Ignition

N/A 15-29 sec

Hot-Wire Ignition

N/A 60-119 sec

High-Ampere Arc Ignition

N/A 120 sec

N/A Armature slot insulation, liners, washers, coil insulation, arc shields, formed specialties and gasket stock.