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Polytrimethylene Terephthalate (PTT)

PTT is a thermoplastic, further classified as a polyester plastic. The graph bars on the material properties cards below compare PTT to: polyester 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

2.5 GPa 0.36 x 106 psi

Elongation at Break

60 %

Flexural Modulus

2.8 GPa 0.4 x 106 psi

Flexural Strength

100 MPa 15 x 103 psi

Tensile Strength: Ultimate (UTS)

60 MPa 8.7 x 103 psi

Other Material Properties

Density

1.3 g/cm3 83 lb/ft3

Melting Onset (Solidus)

230 °C 450 °F

Common Calculations

Stiffness to Weight: Axial

1.0 points

Stiffness to Weight: Bending

34 points

Strength to Weight: Axial

13 points

Strength to Weight: Bending

26 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