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Material Information

Torlon® 4301 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® 4301 is the grade best suited for general purpose wear and friction parts. Torlon® 4301 contains 12% graphite powder and 3% PTFE, which gives the material a very low expansion rate, a low coefficient of friction, and little or no slip-stick while in use. Its flexural modulus is also higher than most other advanced engineering plastics (1,000,000 psi). These characteristics allow Torlon® 4301 to excel in severe service wear applications. It is available in the form of sheets and rod. Quadrant® EPP uses the brand name Duratron® T4301 for this material.


  • Non-lubricated bearings
  • Seals
  • Bearing cages
  • Reciprocating compressor parts


  • Very low expansion rate
  • Low coefficient of friction
  • Little or no slip-stick
  • Very high flexural modulus
  • Superior resistance to elevated temperatures
  • Good dimensional stability
  • Creep resistant
  • Self-lubricating
  • Good chemical resistance
  • Lightweight
  • Superior mechanical properties at elevated temperatures
  • Absorbs moisture


PhysicalAstm Test MethodDuratron® T4301 PAI
Density (lb/in^3)D7920.052
Specific GravityD7921.45
Water Absorption @ 24 hours (%)D5700.4
Water Saturation (%)D5701.5
Tensile Strength (PSI)D63815,000
Tensile Modulus (PSI)D638900,000
Tensile Elongation at Break (%)D6383
Flexural Strength (PSI)D79023,000
Flexural Modulus (PSI)D790800,000
Shear Strength (PSI)D73216,400
Compressive Strength (PSI)D69522,000
Compressive Modulus (PSI)D695950,000
Izod Impact (Notched), ft-lb/inD2560.8
Rockwell HardnessD785E70, M106
Coefficient of Friction (Dry vs Steel)
PTM 550070.2
Limiting PV (4:1 Safety Factor)
PTM 5500722,500
Wear Factor “K” x 10^-10
PTM 5501010
Coefficient of Thermal Expansion,
Heat Deflection Temperature 264 psi, ºFD648534
Glass Transition Temp, ºFD3418527
Continous Service Temp (Operating), °F500
Thermal Conductivity, BTU-in/hr-ft² °FF4333.7
Flammability RatingUL94VO
Dielectric Strength, Short Term,
(Volts/Mil) @ .125″ Thick
Surface Resistivity (ohms/square)EOS/ESD S11.11> 10^13
Dielectric Constant at 1 MHzD1506
Dissipation Factor at 1 MHzD1500.037

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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