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Material Information

Vulcanized fibre is a laminate material formed by the reaction and crosslinking of pure cellulose cotton in a zinc chloride acid bath. It possesses high tensile and tear strength, excellent arc resistance, and both good electrical and mechanical properties where moisture is not a factor. Vulcanized fibre is available and in tube, rod, strip, and sheets in a variety of thicknesses. Sheet is available in the colors black, grey, and red. Thin flexible vulcanized fibre has superior electrical properties and also superior bending qualities. Vulcanized fibre is easy to machine, and has a maximum operating temperature of 400º F. It is easily bent, sawed, sheared, punched, milled, turned, and drilled. It is also insoluble in ordinary solvents and unaffected by alcohol, ether, ammonia, turpentine, naptha, benzene, and petroleum.  
Commercial Grade: Most common grade, available gray, black or red. Applications include washers, gaskets, gears and handles.
Electrical Grade: High dielectric gray, 100% cotton, very flexible, (historically called “fish-paper”). This grade is suitable for layer and ground insulation and has variations, including “top-stick” grade used for wedges in small motors.
Bone Fibre: Exceptionally hard and dense, used for tight machining, tubing, pool cue tips, and cut out fuses.


  • Gaskets
  • Washers
  • Handles
  • Die Cutting
  • Abrasive disc backing
  • Tags
  • Arc shields
  • Barriers
  • Brush holders
  • Bushings
  • Coil forms
  • Armatures
  • Fuse cartridges
  • Motor, switch, and transformer insulation
  • Terminal strips


  • Excellent arc resistance
  • Good electrical and mechanical properties in dry conditions
  • Superior bending qualities
  • Easy to machine
  • Lightweight
  • Tear resistant
  • High tensile strength
  • Insoluble in ordinary solvents
  • Unaffected by alcohol, ether, ammonia, turpentine, naptha, benzene, and petroleum.


Typical Properties of Vulcanized Fiber Commercial Grade
  • Tensile Strength, psi 6,000 – 12,000
  • Flexural Strength, psi 12,000 – 20,000
  • Compressive Strength, psi 20,000 – 30,000
  • Shear Strength, psi 11,000-15,000
  • Impact Strength, ft/lbs per in. 4 – 8
  • Rockwell Hardness R60 – R100
  • Density, gm/cc 1.1 – 1.3
  • Dielectric Strength, vpm 150 – 400
  • Power Factor, 1000kc .03 – .08
  • Dielectric Constant 4 – 7
  • Water Absorption, 2hr, 1/8″,% 15
  • Thermal Conductivity, btu/hr/sqft/F/in 3

Disclosure: The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers’ complete material property datasheets. All values at 73°F (23°C) unless otherwise noted.


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