Polyethersulfone (PES)

PES is a thermoplastic material, further classified as a sulfone plastic.

Material Properties

Density1.4 g/cm3 (87 lb/ft3)

Dielectric Constant (Relative Permittivity)3.5

Dielectric Strength (Breakdown Potential)16 kV/mm (0.63 V/mil)

Elastic (Young's, Tensile) Modulus2.6 GPa (0.38 x 106 psi)

Electrical Resistivity Order of Magnitude15 10x Ω-m

Elongation at Break65 %

Flexural Modulus2.6 GPa (0.38 x 106 psi)

Flexural Strength130 MPa (19 x 103 psi)

Glass Transition Temperature220 °C (430 °F)

Heat Deflection Temperature At 1.82 MPa (264 psi)200 °C (390 °F)

Heat Deflection Temperature At 455 kPa (66 psi)210 °C (410 °F)

Heat of Combustion (HOC)25 MJ/kg

Limiting Oxygen Index (LOI)36 %

Specific Heat Capacity1100 J/kg-K

Strength to Weight Ratio62 kN-m/kg

Tensile Strength: Ultimate (UTS)87 MPa (13 x 103 psi)

Thermal Conductivity0.18 W/m-K

Thermal Diffusivity0.12

Thermal Expansion53 µm/m-K

Water Absorption After 24 Hours0.34 %

Further Reading

Modern Plastics Handbook, Charles A. Harper (editor), 1999

Plastics Materials, 7th ed., J. A. Brydson, 1999

SPI Plastics Engineering Handbook of the Society of the Plastics Industry, Inc., 5th ed., Michael L. Berins (editor), 2000