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Polytetramethylene Terephthalate (PTMT)

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

Thermal Properties

Heat Deflection Temperature At 1.82 MPa (264 psi)

50 °C 120 °F

Heat Deflection Temperature At 455 kPa (66 psi)

150 °C 300 °F

Maximum Temperature: Mechanical

130 °C 270 °F

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz

3.2

Dielectric Strength (Breakdown Potential)

17 kV/mm 0.64 V/mil

Other Material Properties

Density

1.3 g/cm3 82 lb/ft3

Impact Strength: Notched Izod

53 J/m 1.0 ft-lb/in

Tensile Strength: Ultimate (UTS)

56 MPa 8.1 x 103 psi

Common Calculations

Strength to Weight: Axial

12 points

Strength to Weight: Bending

25 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