PAI is Widely Used For:

  • Semiconductor machinery parts
  • Chip test sockets
  • Aerospace components
  • Electrical connectors
  • Bearings and bushings
  • Bearing cages
  • Pump and valve parts
  • Seals

Performance Characteristics:

  • Strong and stiff
  • Performs well at elevated temperatures
  • Extremely low thermal expansion
  • Excellent electrical insulating properties (electrical grade)
  • Outstanding bearing and wear properties (bearing grade)
  • Good resistance to many common solvents, fuels, and acids

Common Brands:

  • Tecator
  • Torlon® PAI
  • Duratron® PAI


Extremely strong, stiff, dimensionally stable plastic material often used in elevated temperature environments

PAI (polyamide-imide) is an extremely strong and stiff plastic material. It is often used in elevated temperature environments where other thermoplastics would lose their mechanical properties. 

PAI is a very dimensionally stable material with an extremely low coefficient of thermal expansion (CTE) making it an excellent choice for applications that require machining to tight tolerances. It is available in a variety of formulations.

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SHEET Dimensions:
12 in x 48 in
0.250 in – 1 in
ROD Outside Diameter:
0.394 in – 3.940 in
COLOR Natural
GRADES Bearing, Electrical

Length, width, thickness, and diameter tolerances vary by size, by manufacturer, brand, and grade. Custom sizes available upon request.


PAI Properties and Material Options

Unfilled/Electrical Grade PAI– has extremely high dielectric strength and it is often used for applications where it functions as an electrical insulator. 

Bearing Grade PAI– can be used for demanding bearing applications that require extreme loads, speeds, and/or elevated temperatures.


Typical properties of PAI
Tensile strength psi D638 20,000 15,000
Flexural modulus psi D790 600,000 800,000
Izod impact (notched) ft-lbs/in of notch D256 2.0 0.8
Heat deflection temperature @ 264 psi °F D648 532 534
Water absorption (immersion 24 hours) % D570 0.4 0.28
Coefficient of linear thermal
in/in/°Fx10-5 D696 1.7 1.4

Note: The properties reported reflect typical values for extruded PAI shapes. The properties of compression molded and injection molded PAI will vary from these values.

Values may vary according to brand name. Please ask your Curbell Plastics representative for more specific information about an individual brand.

Explore the physical, mechanical, thermal, electrical, and optical properties of PAI.

Sort, compare, and find the plastic material suited for your application using our interactive properties table.


PAI (polyamide-imide) Comparison Properties Charts - Flexural Modulus, Heat Deflection Temperatures and Continuous Service Temperature