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Vespel is a  plastic that doesn't melt at any temperature

Vespel®(High-Performance Polyimide-Based Plastic)

  • Withstands temperatures up to 550° F
  • Excellent mechanical strength and stiffness
  • Ultra low outgassing
  • Natural lubricity
  • Does not melt at any temperature
  • Good wear and chemical resistance


Vespel® is a high-performance material with notable characteristics: it withstands wide temperature ranges; it is wear and chemical resistant; it has excellent mechanical and insulation properties; it has natural lubricity; and unlike most polymers, it does not produce significant outgassing even at high temperatures. Vespel does not melt at any temperature. As a result, it is used in many aerospace, semiconductor and transportation applications.


  • Bearings, washers and seal rings
  • Seals and insulators
  • Semiconductor clamping rings and screws
  • Ball seal valves and compressor applications


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 thermoplastics, click here.

General Material Properties

Property   Metric units   English units
Density   1.33e3 - 1.43e3 kg/m^3   0.048 - 0.0517 lb/ft^3
Yield Strength   8.62e7 - 8.96e7 Pa   12.5 - 13 ksi
Tensile Strength   7.24e7 - 1.18e8 Pa   10.5 - 17.1 ksi
Elongation   0.075 - 0.9 % strain   7.5 - 90 % strain
Hardness (Vickers)   2.54e8 - 2.64e8 Pa   25.9 - 26.9 HV
Impact Strength (unnotched)   7.9e3 - 9e3 J/m^2   3.76 - 4.28 ft.lbf/in^2
Fracture Toughness   2.16e6 - 6.4e6 Pa/m^0.5   1.97 - 5.82 ksi/in^0.5
Young's Modulus   2.07e9 - 2.76e9 Pa   0.3 - 0.4 10^6 psi
Max Service Temperature   221 - 241 °C   430 - 466 °F
Melting Temperature   375 - 401 °C   707 - 754 °F
Insulator or Conductor   Insulator   Insulator
Specific Heat Capability   1.39e3 - 1.45e3 J/kg °C   0.333 - 0.346 BTU/lb. °F
Thermal Expansion Coefficent   8.1e-5 - 1.01e-4 strain/°C   45 - 56 µstrain/°F
CO2 Footprint   9.08 - 10 kg/kg   9.08 - 10 lb/lb
Recycleable   Yes   Yes

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: August 16, 2012