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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