Unfilled PPS
Unfilled PPS is a grade of PPS. It has the lowest strength and highest ductility compared to the other variants of PPS. The graph bars on the material properties cards below compare unfilled PPS to: polyphenylene 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
Compressive (Crushing) Strength
95 MPa 14 x 103 psi
Elastic (Young's, Tensile) Modulus
3.9 GPa 0.57 x 106 psi
Elongation at Break
11 %
Flexural Strength
120 MPa 17 x 103 psi
Impact Strength: Notched Izod
21 J/m 0.38 ft-lb/in
Rockwell R Hardness
120
Tensile Strength: Ultimate (UTS)
75 MPa 11 x 103 psi
Thermal Properties
Glass Transition Temperature
190 °C 370 °F
Heat Deflection Temperature At 1.82 MPa (264 psi)
130 °C 270 °F
Maximum Temperature: Autoignition
580 °C 1070 °F
Maximum Temperature: Decomposition
500 °C 930 °F
Maximum Temperature: Mechanical
210 °C 400 °F
Melting Onset (Solidus)
290 °C 550 °F
Specific Heat Capacity
1000 J/kg-K 0.24 BTU/lb-°F
Thermal Conductivity
0.25 W/m-K 0.14 BTU/h-ft-°F
Thermal Expansion
45 µm/m-K
Electrical Properties
Dielectric Strength (Breakdown Potential)
28 kV/mm 1.1 V/mil
Electrical Resistivity Order of Magnitude
9.0 10x Ω-m
Otherwise Unclassified Properties
Density
1.3 g/cm3 82 lb/ft3
Limiting Oxygen Index (LOI)
46 %
Water Absorption After 24 Hours
0.020 %
Common Calculations
Stiffness to Weight: Axial
1.6 points
Stiffness to Weight: Bending
40 points
Strength to Weight: Axial
16 points
Strength to Weight: Bending
30 points
Thermal Diffusivity
0.19 mm2/s
Thermal Shock Resistance
31 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