PAI: Ultra-Structuring Thermoplastic for Extreme Stress

A hybrid polymer for precision mechanics and high temperatures

PAI (polyamide-imide) is a reinforced amorphous thermoplastic known for its exceptional rigidity, unrivalled thermal resistance (up to 270°C continuous), and very high mechanical strength, even in humid or chemically aggressive environments.

This material combines the properties of a thermosetting polymer (mechanical strength, rigidity) with the processability of a thermoplastic, making it unique in the category of ultra-high-performance engineering plastics.

Technical properties of PAI

Extreme heat resistance

  • Continuous operating temperature: up to 270°C
  • Withstands heat peaks and intense thermal cycling without deformation

Maximum mechanical stability

  • Modulus of elasticity > 5 GPa, rigid even when hot
  • Low creep and excellent abrasion resistance

Very low thermal expansion

  • Exceptional dimensional stability
  • Ideal material for precision-fitted parts

Good chemical resistance

  • Resistant to oils, fuels, solvents and detergents
  • Compatible with harsh industrial environments

Excellent tribological properties

  • Low coefficient of friction, ideal for lubrication-free moving parts
  • Mechanical strength maintained even with prolonged sliding

Areas of application of the PAI

Aerospace

  • Bushings, bearings, slides, spacers, landing gear components
  • Replaces metal alloys in extreme environments

Automotive & racing

  • Gears, pulleys, idlers, friction components
  • Excellent resistance to heat and dynamic loads

Machine tools & mechatronics

  • High-precision moving components, slides, guides
  • Tight tolerances even in hot, humid environments

Power & nuclear industries

  • Parts exposed to radiation or severe thermal cycling
  • High-reliability applications with extended service life

PAI grades available at DEMGY

Torlon® 4203

  • Uncharged grade, high purity and excellent electrical performance
  • High operating temperature with excellent machinability

Torlon® 4301

  • PTFE + graphite reinforced, very low coefficient of friction
  • Ideal for tribological applications in dry environments

Torlon® 5530

  • Glass-fiber reinforced, extreme rigidity and dimensional stability
  • Structural components exposed to high mechanical stress

Why choose PAI Torlon® from DEMGY?

  • High-precision machining in our specialized HPM workshops
  • Assistance in grade selection according to constraints (heat, slippage, load)
  • Availability in standard or custom machinable forms
  • Full material traceability and technical expertise on critical applications

Conclusion: PAI for precision components under extreme conditions

Polyamide-imide is one of the best-performing polymers on the market for highly demanding mechanical applications. With the Torlon® range and DEMGY's know-how, you benefit from a material designed to last, resist and guarantee precision --- even at very high temperatures.

Associated products