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Vespel® SP-3 is 15% moly-filled (milybdenum disulfide solid lubricant) for wear and friction resistance in vacuum and other moisture free environments where graphite actually becomes abrasive. Typical applications of Vespel® SP-3 include seals, bushings, bearings, gears, and other wear surfaces in outer space, ultra-high vacuum or dry gas applications.

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At a Glance

Available In
Sheet, Rod, Ball

ASTM-D 6456-99 Ty 3, AMS 3644 Class 5, Mil-R-46198 Type 3

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Technical Information

Stock Products Properties Applications Advantages Grades

Stock Products

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

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 0.058
Water Absorption. 24 hrs % D570 1.60
Mechanical PropertiesUnitsASTMResults
Tensile Strength @yield psi D638 8200
Tensile Modulus psi D638
Tensile Elongation @Break % D638 4.0
Flexural Strength psi D790 11,000
Flexural Modulus psi D790 475,000
Hardness. Rockwell R D785 E40-55
IZOD Impact Strength Notched ft-lb/in D256
Thermal PropertiesUnitsASTMResults
Coefficient of Linear Thermal Expansion (x 10-5 in./in./°F) D256 2.9
Max Continuous Operating Temperature °F 500
Heat Deflection Temp at 264 psi °F
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
  • Bearings
  • Piston rings
  • Seals
  • Gears


  • Maximum wear and friction resistance in vacuums and other dry environments
  • Ultra low out-gassing
  • High performance in aerospace applications


  • Vespel® SP-1
  • Vespel® SP-21
  • Vespel® SP-22
  • Vespel® SP-211
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