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Polyethersulfone (PES)

PES is a thermoplastic, further classified as a sulfone plastic. It has a moderately high ductility and a moderately high tensile strength relative to other thermoplastics.

Mechanical Properties

Graph bars compare PES to other materials. From top to bottom: sulfone plastic, thermoplastics, and the entire database.

Elastic (Young's, Tensile) Modulus

2.6 GPa 0.38 x 106 psi

Elongation at Break

65 %

Flexural Modulus

2.6 GPa 0.38 x 106 psi

Flexural Strength

130 MPa 18 x 103 psi

Impact Strength: Notched Izod

91 J/m 1.7 ft-lb/in

Strength to Weight Ratio

64 kN-m/kg

Tensile Strength: Ultimate (UTS)

87 MPa 13 x 103 psi

Thermal Properties

Glass Transition Temperature

220 °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

Specific Heat Capacity

1100 J/kg-K 0.26 BTU/lb-°F

Thermal Conductivity

0.18 W/m-K 0.1 BTU/h-ft-°F

Thermal Diffusivity

0.12 m2/s

Thermal Expansion

53 µm/m-K

Other Material Properties

Density

1.4 g/cm3 86 lb/ft3

Dielectric Constant (Relative Permittivity) At 1 Hz

3.5

Dielectric Constant (Relative Permittivity) At 1 MHz

3.5

Dielectric Strength (Breakdown Potential)

16 kV/mm 0.63 V/mil

Electrical Dissipation At 1 Hz

0.0010

Electrical Dissipation At 1 MHz

0.0035

Electrical Resistivity Order of Magnitude

15 10x Ω-m

Limiting Oxygen Index (LOI)

36 %

Water Absorption After 24 Hours

0.34 %

Followup Questions

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