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Material Information

Torlon® 4203 PAI is an amorphous thermoplastic called a polyamide-imide. It is an extruded grade of Torlon®. Torlon® is the highest performing melt processable plastic and has superior resistance to elevated temperatures. It is able to perform with superior mechanical properties under severe stress conditions at continuous temperatures up to 500º F. Its glass transition temperature is 537º F. It also has good dimensional stability and creep, impact, and chemical resistance. However, Torlon® has a relatively high moisture absorption rate so it should be kept dry prior to insulation. Torlon® 4203 is the grade best suited for electrical or high strength applications. It specifically offers excellent compressive and impact strength and the highest elongation of the Torlon® grades. Because of its great electrical insulation, this grade is commonly used for electrical connectors and insulators. Quadrant® EPP uses the brand name Duratron® T4203 for this material.


  • Electrical connectors
  • Electrical insulators
  • Chip nests
  • Sockets
  • Wear applications
  • Linkages
  • Seal rings


  • Excellent compressive and impact strength
  • Excellent electrical insulation
  • High dielectric strength
  • Superior resistance to elevated temperatures
  • Good dimensional stability
  • Creep resistant
  • Self-lubricating
  • Lightweight
  • Good chemical resistance
  • Superior mechanical properties at elevated temperatures
  • Absorbs moisture


PhysicalAstm Test MethodDuratron® T4203 PAI
Density (lb/in^3)D7920.051
Specific GravityD7921.41
Water Absorption @ 24 hours (%)D5700.4
Water Saturation (%)D5701.7
Tensile Strength (PSI)D63820,000
Tensile Modulus (PSI)D638600,000
Tensile Elongation at Break (%)D63810
Flexural Strength (PSI)D79024,000
Flexural Modulus (PSI)D790600,000
Shear Strength (PSI)D73224,000
Compressive Strength (PSI)D69524,000
Compressive Modulus (PSI)D695478,000
Izod Impact (Notched), ft-lb/inD2562
Rockwell HardnessD785E80, M120
Coefficient of Friction (Dry vs Steel)
PTM 550070.35
Limiting PV (4:1 Safety Factor)
PTM 5500712,500
Wear Factor “K” x 10^-10
PTM 5501050
Coefficient of Thermal Expansion,
Heat Deflection Temperature 264 psi, ºFD648532
Glass Transition Temp, ºFD3418527
Continous Service Temp (Operating), °F500
Thermal Conductivity, BTU-in/hr-ft² °FF4331.8
Flammability RatingUL94VO
Dielectric Strength, Short Term,
(Volts/Mil) @ .125″ Thick
Surface Resistivity (ohms/square)EOS/ESD S11.11> 10^16
Dielectric Constant at 1 MHzD1504.2
Dissipation Factor at 1 MHzD1500.026

Disclosure: The information contained herein 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.


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