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Polypropylene (PP) Homopolymer

PP homopolymer is a thermoplastic, further classified as a polypropylene plastic.

The properties of PP homopolymer include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare PP homopolymer to: polypropylene 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

45 to 64 MPa 6.5 to 9.3 x 103 psi

Elongation at Break

3.0 to 80 %

Flexural Modulus

1.5 to 7.0 GPa 0.22 to 1.0 x 106 psi

Flexural Strength

41 to 100 MPa 5.9 to 15 x 103 psi

Impact Strength: Notched Izod

42 to 95 J/m 0.79 to 1.8 ft-lb/in

Rockwell R Hardness

90 to 110

Tensile Strength: Ultimate (UTS)

36 to 93 MPa 5.1 to 13 x 103 psi

Thermal Properties

Glass Transition Temperature

170 °C 340 °F

Heat Deflection Temperature At 1.82 MPa (264 psi)

73 to 160 °C 160 to 320 °F

Maximum Temperature: Mechanical

120 °C 250 °F

Specific Heat Capacity

1230 to 1900 J/kg-K 0.29 to 0.45 BTU/lb-°F

Thermal Expansion

30 to 90 µm/m-K

Otherwise Unclassified Properties


0.91 to 1.2 g/cm3 56 to 76 lb/ft3

Water Absorption At Saturation

0.010 to 0.090 %

Common Calculations

Strength to Weight: Axial

11 to 21 points

Strength to Weight: Bending

27 to 37 points

Followup Questions

Further Reading

ASTM D883: Standard Terminology Relating to Plastics

Reinforced Plastics Durability, Geoffrey Pritchard (editor), 1999

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