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Materials

Thermosets

Fish paper is a good choice when fabricated parts require excellent insulative properties

Fish Paper (Vulcanized Fibre)

  • Flexible yet durable
  • Excellent insulating properties
  • Can be die cut or machined
  • Superior punching and forming qualities

Characteristics

Fish paper is a strong, flexible paperboard that has good mechanical properties. It offers excellent electrical insulating and arc quenching properties. It is a good choice for applications in which moisture is not a factor and where temperatures do not exceed 425 degrees F. It can be die cut and machined.

Fish paper is insoluble in ordinary solvents and is unaffected by ammonia, turpentine, naptha, benzene, petroleum, alcohol and ether. It has superior bending qualities and is especially useful for armature slot insulation.

Applications

  • Motor and switch insulation
  • Washers
  • Coil insulation
  • Arc shields
  • Gaskets
  • Transformer insulation

Questions?

Our application engineers can help. With decades of experience in plastic material selection, we'll help you choose the optimal plastic for your application and budget.

To compare
the cost of this material to other thermosets, click here.

General Material Properties

Properties   Thickness
(inches)
Units Commercial Electrical
Density   .062" grams/cc 1.20 1.20
Specific Volume   .062" cu. in./lb 23.0 23.0
Mechanical          
Tensile Strength MD .062" psi 16,000 18,000
  CD .062" psi 9,000 10,000
Modulus of Elasticity in Tension MD .062" psi x 105 12.0 12.0
  CD .062" psi x 105 8.0 8.0
Flexural Strength MD .062" psi 15,000 15,000
  CD .062" psi 13,000 13,000
Compressive Strength   .062" psi 35,000 35,000
Impact Strength, Izod Edgewise MD .062" ft-lbs/in. notch 2.0 2.5
  CD .062" ft-lbs/in. notch 1.8 2.0
Hardness, Rockwell R Scale   .062" Divisions 80 70
Bond Strength, ASTM D-952   .062" psi 900 900
Bursting Strength, Mullen   .016" psi - 325
Tear Strength, Elmendorf MD .016" grams - 550
  CD .016" grams - 700
Electrical          
Dielectric Strength, Short Time   .016" volts/mil 230 300
    .062" volts/mil 200 215
    .125" volts/mil 195 200
Arc Resistance, ASTM D-495   .062" seconds 80 125
Physical          
Thermal Conductivity, 149° F     Btu/hr/ft2/°F/ft. 0.168 0.168
Specific Heat     Btu/lb/°F 0.403 0.403
Heat Resistance, Continuous     °F 230 - 240 230 - 240
Thermal Expansion x 10-5 MD   in/in/°F 1.1 1.1
  CD   in/in/°F 1.7 1.7
Dimensional Change per %
change in Moisture Content
Thick.   % 1.0 1.0
  MD   % 0.1 0.1
  CD   % 0.25 0.25
Water Absorption, 24 hours   .062" % 66.0 63.0
Coefficient of Friction, Fibre on Fibre       0.16 0.16
Coefficient of Friction, Fibre on
Smooth Cast Iron
      0.21 0.21
Flammability, ASTM D-635   .062" in/mm 0.5 0.5

The information on this page is intended as general guidance only and is only accurate at the time of posting (see date below). Specific material properties vary by manufacturer. Please contact a Dielectric application engineer for help in choosing the optimal material for your application and budget.

Posting Date: September 10, 2012