PAI Bearing Grade

PAI Bearing Grade


What is the Material: PAI Bearing Grade is an imidized amorphous material filled with PTFE (Teflon) and graphite.

Key Material Features: This material is beneficial in applications requiring a lower coefficient of friction, while maintaining the properties of other PAI materials including high strength, dimensional stability, diverse chemical resistance, and it maintains its properties at elevated temperatures.

Other Considerations: This material is attacked by hot water and steam.


Property Value Typical ASTM Test
Chemical Designation (PAI) Polyamide-imide
Trade Names (®, ™) Torlon, Tecapai, Duratron
Filler Graphite, PTFE
Color Black
Density (g/cm^3) 1.51 D 792


Property Value Typical ASTM Test
Modulus of Elasticity (Tensile Test) (psi) 580000 D 638
Tensile Strength at Yield (psi) 15500 D 638
Tensile Strength at Break (psi) 9300 D 638
Elongation at Break (%) 3.1 D 638
Flexural Strength (psi) 15000 D 790
Modulus of Elasticity (Flexural Test) (psi) 580000 D 790
Compression Strength: 10% Strain (psi) 22000 D 695
Compression Strength: 1% Strain (psi) 4500 D 695
Compression Modulus (psi) 350000 D 695
Impact Strength (Izod) (ft-lbs/in) 0.6 D 256
Hardness (D) 88 D 785
Hardness (E) 76
Hardness (M) 114 D 785
Coefficient of Friction (Kinetic, 40 psi, 50 fpm) 0.18 D 3702
Coefficient of Friction (Static) 0.14 D 3702
Wear (K) Factor (in^3-min/ft-lbs-hr) (Against Steel, 40 psi, 50 fpm) 3.15E-8 D 3702


Property Value Typical ASTM Test
Glass Transistion Temperature (°F) 529 D 3418
Deflection Temperature (°F) (264 psi) 500 D 648
Thermal Expansion (CLTE) (in/in/°F) 1.94E-5 D 696
Thermal Conductivity (BTU-in/hr-ft^2-°F) 2.81


Property Value Typical ASTM Test
Specific Surface Resistance (Ω/square) 1.00E13 D 257


Property Value Typical ASTM Test
Moisture Absorption (%) (24 Hours) 0.2 D 570
Moisture Absorption (%) (Saturated) 1.6 D 570
Flammability V-0
The data stated are typical values intended for reference and comparison purposes only. The data should not be used as a basis for design specifications or quality control. The information is provided as a guide to the best of our knowledge and given without obligation or liability. Testing under individual application circumstances is recommended.