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vulcanized fiberVulcanized Fiber (aka Fishpaper – Vulcanized Fiber) is a strong cellulose paperboard insulation. It is used primarily for its excellent electrical insulating properties.

Fishpaper is the name for the electrical grade of vulcanized fiber. Fishpaper properties include light weight, and ease of forming and punching. Fishpaper is unique because it is more resistant to heat and cold than comparable plastic material. Available in thinner gauges, typically from 0.0078″ to 0.062″ thick; fishpaper’s standard color is grey.

Vulcanized Fiber is a hard, durable, chemically pure cellulose product that contains no resin or bonding agents. It offers flexibility, impact resistance, high tear strength and a smooth, abrasion resistant surface. It can be machined, punched, slit, threaded, formed, molded and wound into tubes for literally countless applications. Vulcanized fiber is available from .0078″ to 0.375″ thick in several colors. Certifies to NEMA Commercial grade per MIL-F-1148, C-H; MIL-F-13526, red sheet.

Brand Names

  • Peerless®
  • Vulcanex®
  • Forbon® 
  • Armite®

Emco Industrial Plastics doesn’t claim to represent all of the manufacturers or trade name products listed. This list is intended as a guide of typical materials available for purchase from Emco Industrial Plastics, Inc. For additional information, contact an Emco Industrial Plastics representative by filling out the form below.

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At a Glance

Available In
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Technical Information

Stock Products Properties Applications Advantages Grades

Stock Products

Sheet 0.010 – 0.375″ TH
Tube Custom


Physical PropertiesUnitsASTMResults
Density lb/in3 D792 0.0434
Water Absorption, 24 hrs % D570 66
Mechanical PropertiesUnitsASTMResults
Tensile Strength – MD psi D638 16000
Tensile Strength – CD psi D638 9000
Tensile Modulus – MD psi D638 12000
Tensile Modulus – CD psi D638 8000
Flexural Strength – MD psi D790 15000
Flexural Strength – CD psi D790 13000
Flexural Modulus – MD psi D790 12000
Flexural Modulus – CD psi D790 8000
Compressive Strength psi D695 35000
Hardness, Rockwell R D785 R80
IZOD Impact Strength Edgewise – MD ft-lb/in D256 2
IZOD Impact Strength Edgewise – CD ft-lb/in D256 1.8
Thermal PropertiesUnitsASTMResults
Coefficient of Linear Thermal Expansion – Lengthwise (x 10-5 in./in./°F) D696 1.1
Coefficient of Linear Thermal Expansion – Crosswise (x 10-5 in./in./°F) D696 1.7
Thermal Conductivity. 149º F BTU-in/ft2-hr-°F C-177 0.168
Flammability Rating UL-94 94 H – B
Electrical PropertiesUnitsASTMResults
Dielectric Strength V/mil D149 200
Arc Resistance sec D495 80

NOTE: The property values presented above 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.


  • Wear plates
  • Arc barriers
  • Washers, gaskets
  • Electrical instruments, devices
  • Electrical insulation


  • Excellent insulation properties
  • Can be die cut or machined
  • Flexible
  • High mechanical strength
  • Lightweight
  • Excellent electrical properties
  • Good moisture resistance



MIL-F-1148, MIL-I-695, MIL-F-10336, MIL-F-13526

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