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