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40% Glass Fiber (40 GF) PP Homopolymer

40 GF PP homopolymer is a grade of PP homopolymer. It has the highest strength and lowest ductility compared to the other variants of PP homopolymer. The graph bars on the material properties cards below compare 40 GF 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

64 MPa 9.3 x 103 psi

Elongation at Break

3.0 %

Flexural Modulus

7.0 GPa 1.0 x 106 psi

Flexural Strength

100 MPa 15 x 103 psi

Impact Strength: Notched Izod

95 J/m 1.8 ft-lb/in

Rockwell R Hardness


Tensile Strength: Ultimate (UTS)

93 MPa 13 x 103 psi

Thermal Properties

Glass Transition Temperature

170 °C 340 °F

Heat Deflection Temperature At 1.82 MPa (264 psi)

160 °C 320 °F

Maximum Temperature: Mechanical

120 °C 250 °F

Specific Heat Capacity

1230 J/kg-K 0.29 BTU/lb-°F

Thermal Expansion

30 µm/m-K

Otherwise Unclassified Properties


1.2 g/cm3 76 lb/ft3

Water Absorption At Saturation

0.090 %

Common Calculations

Strength to Weight: Axial

21 points

Strength to Weight: Bending

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