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vespelVespel® SP-1 is an unfilled base resin grade. SP-1 provides maximum physical strength, elongation, as well as the best electrical and thermal insulation valves. Vespel® SP-1 is high performance polyimide, which offers a broad combination of temperature resistance, chemical resistance, mechanical toughness, natural lubricity, wear resistance, and insulation properties. Vespel® SP-1 provides operating temperatures from cryogenic too 300 degrees C (570 degrees F), great plasma resistance plus a UL rating for minimal electrical and thermal conductivity. Typical applications include spacers, high temperature fixtures, valve seats, balls, gaskets, insulators, and seals.

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
Sheet, Rod, Balls

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Technical Information

Stock Products Properties Applications Advantages Grades Downloads

Stock Products

Sheet 0.062″ – 2.0″ 10″ x 10″ Natural
Rod 1/4″ – 6″ DIA CTS Natural
Balls .125″, .250″, .375″, .500″, .625″ Note: Ball diameter tolerances are +/- .002″ Natural

Give us your cut-to-size dimensions. We will precision-cut these plastics to your exact size. Additional sizes and colors available upon request.


Physical PropertiesUnitsASTMResults
Density lb/in3 D792 0.051
Water Absorption. 24 hrs % D570 .24
Mechanical PropertiesUnitsASTMResults
Tensile Strength @yield psi D638 12,500
Tensile Modulus psi D638
Tensile Elongation @Break % D638 7.5
Flexural Strength psi D790 16,000
Flexural Modulus psi D790 450,000
Hardness. Rockwell R D785 E45-60
IZOD Impact Strength Notched ft-lb/in D256 0.8
Thermal PropertiesUnitsASTMResults
Coefficient of Linear Thermal Expansion (x 10-5 in./in./°F) D256 3.0
Max Continuous Operating Temperature °F 500
Heat Deflection Temp at 264 psi °F 680

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.


  • Bushings
  • Balls
  • Gaskets
  • Thrust washers and discs
  • Flanged bearings
  • Plungers
  • Printer wire guides
  • Spine couplings
  • Rotary seal rings
  • Valve seats
  • Thermal and electrical insulators
  • Wafer clamping
  • Wafer guides
  • Vacuum pads
  • Die pickup collects


  • Excellent temperature resistance
  • High wear resistance
  • Dimensionally stable
  • Resistant to radiation
  • Extremely low out gassing
  • Easy to machine
  • Unfilled resins
  • Ultra high purity


  • Vespel® SP-21
  • Vespel® SP-22
  • Vespel® SP-211
  • Vespel® SP-3

NOTE: Several grades of this material are available. For additional information regarding this plastic, contact your Emco Industrial Plastics representative or call 973-459-4321.


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