Low Friction PAI
Low friction PAI is a grade of PAI. It has the lowest strength and lowest ductility compared to the other variants of PAI. The graph bars on the material properties cards below compare low friction PAI to: imide plastics (top), all thermoplastics (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
6.0 GPa 0.87 x 106 psi
Elongation at Break
3.0 %
Flexural Modulus
6.0 GPa 0.87 x 106 psi
Flexural Strength
160 MPa 23 x 103 psi
Shear Strength
120 MPa 17 x 103 psi
Tensile Strength: Ultimate (UTS)
100 MPa 15 x 103 psi
Thermal Properties
Glass Transition Temperature
280 °C 530 °F
Heat Deflection Temperature At 1.82 MPa (264 psi)
280 °C 540 °F
Maximum Temperature: Autoignition
530 °C 980 °F
Maximum Temperature: Decomposition
490 °C 910 °F
Maximum Temperature: Mechanical
260 °C 500 °F
Thermal Conductivity
0.53 W/m-K 0.31 BTU/h-ft-°F
Thermal Expansion
25 µm/m-K
Other Material Properties
Density
1.5 g/cm3 91 lb/ft3
Dielectric Constant (Relative Permittivity) At 1 MHz
6.0
Limiting Oxygen Index (LOI)
45 %
Water Absorption After 24 Hours
0.4 %
Water Absorption At Saturation
1.5 %
Common Calculations
Stiffness to Weight: Axial
2.3 points
Stiffness to Weight: Bending
42 points
Strength to Weight: Axial
19 points
Strength to Weight: Bending
33 points
Thermal Diffusivity
0.16 to 0.41 mm2/s
Thermal Shock Resistance
48 points
Followup Questions
Further Reading
SPI Plastics Engineering Handbook of the Society of the Plastics Industry, Inc., 5th ed., Michael L. Berins (editor), 2000
Modern Plastics Handbook, Charles A. Harper (editor), 1999
Plastics Materials, 7th ed., J. A. Brydson, 1999