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Vespel® is a high performance polyimide material which is formed from resin manufactured only by DuPont. Polyimide materials are characterized by a ring-shaped molecular structure containing Nitrogen.

Vespel® is one of the highest performing engineering plastics currently available. Vespel® will not melt and can operate continuously from cryogenic temperatures to 550°F (288°C), with excursions to 900°F (482°C).

Vespel® parts consistently exhibit superior performance in a variety of applications requiring low wear and long life in severe environments.


  • Excellent temperature resistance
  • High wear resistance (especially SP-21)
  • Dimensionally stable
  • Resistant to radiation
  • Extremely low outgassing
  • Relatively easy to machine


  • Rotary seal rings
  • Thrust washers and discs
  • Bushings
  • Flanged bearings
  • Plungers
  • Printer wire guides
  • Spline couplings
  • Wear strips
  • Valve seats
  • Thermal and electrical insulators
  • Wafer clamping, polishing and grinding rings
  • Wafer guides & carriers
  • Vacuum pads
  • Die pickup collets


Vespel® SP-1

Vespel® SP-1 is the unfilled base resin grade. SP-1 provides maximum physical strength, elongation, and toughness as well as the best electrical and thermal insulation values. Typical applications include spacers, high-temp fixtures, valve seats, balls, gaskets, insulators, and seals.

Vespel® SP-21

Vespel® SP-21 has 15% graphite by weight added to the base resin for increased wear resistance and reduced friction in applications such as bearings, thrust washers, bushings, seal rings, slide blocks and other wear applications. SP-21 has the highest mechanical properties of the graphite filled grades.

Vespel® SP-22

Vespel® SP-22 has 40% graphite by weight for enhanced wear resistance, lower friction, improved dimensional stability (low coefficient of thermal expansion), and stability against oxidation. Typical uses are the same as those for SP-21.

Vespel® SP-211

Vespel® SP-211 has 10% Teflon® PTFE and 15% graphite by weight added to the base resin for the lowest coefficient of friction over a wide range of operating conditions. It also has excellent wear resistance up to 300°F (149°C). Typical applications include sliding or linear bearings as well as many wear and friction uses listed above.

Vespel® SP-3

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

VESPEL is a registered trademark of DuPont.