High resistance to heat and combustibility, low smoke emission, and transparency are the combination of properties possessed by stock shapes extruded from PES. These, coupled with light weight, good impact resistance, dimensional stability, and chemical resistance, make stock shapes extruded from PES resin useful in the electrical/electronics, aerospace/aircraft, automotive, and mass transit industries. PES stock shapes are also applicable for heat and fire safety, food service, and hospital and health care items.

The following physical property information is based on typical values of the base polyethersulfone resin (PES).

Applications Include:

  • Printed circuits
  • High intensity light bases
  • Safety face shields
  • Machine guards
  • Connectors

Advantages of PES

  • Low smoke generation
  • Excellent electrical properties at elevated temperatures
  • Transparency
  • Excellent chemical resistance
  • Easily machined

Manufacturing Capabilities:

Rod: 3/16” to 6” diameter
Sheet: .035” to 4” thick
Film: .001” to .029” thick
Slab: 1/4” to 4” thick


  • Transparent (custom colors available)
Electrical Properties Test Method Result
Metric English
Dielectric Strength ASTM D149 15 V/µm 380 V/mil
Dielectric Constant at 1kHz ASTM D150 3.5 3.5
Dissipation Factor at 1 kHz ASTM D150 0.0022 0.0022
Volume Resistivity ASTM D257 1.7 x 1015 ohm·cm 6.7 x 1014 ohm·in
Mechanical Properties Test Method Result
Metric English
Tensile Strength at yeild ASTM D638 83 MPa 12 kpsi
Tensile Strength at break ASTM D638 MPa kpsi
Tensile Modulus ASTM D638 2654 MPa 385 kpsi
Tensile Elongation at yield ASTM D638 5.5 % 5.5 %
Tensile Elongation at break ASTM D638 50.0 – 100.0 % 50.0 – 100.0 %
Flexural Strength at yield ASTM D790 111 MPa 16.1 kpsi
Flexural Modulus ASTM D790 2896 MPa 420 kpsi
Compressive Strength at yield ASTM D695 100 MPa 14.5 kpsi
Compressive Modulus ASTM D695 2675 MPa 388 kpsi
Izod Impact Strength Un-notched ASTM D256 No Break J/cm No Break ft·lb/in
Izod Impact Strength Notched at 73 ºF ASTM D256 0.85 J/cm 1.6 ft·lb/in
Hardness (R M L or D) ASTM D7852 R127 R127
Optical Properties Test Method Result
Metric English
Haze ASTM D1746 8 % 8 %
Transparency ASTM D1746 76 % 76 %
Other Properties Test Method Result
Metric English
Specific Gravity ASTM D792 1.37 1.37
Water Absorption at 24 hours ASTM D570 1.85 % 1.85 %
Thermal Properties Test Method Result
Metric English
Heat Deflection Temp. at 66 psi ASTM D648 214 ºC 417 ºF
Heat Deflection Temp. at 264 psi ASTM D648 204 ºC 399 ºF
Coefficient of Thermal Expansion ASTM D696 4.9 x 10-5 m/m/ºC 2.7 x 10-5 in/in/ºF
Flammability Rating-UL94 at 0.031 V-0 V-0
Thermal Conductivity ASTM C177 0.163 watt·meter/K 1.13 BTU·in/hr·ft2·ºF
Limiting Oxygen Index ASTM D2863 39.3 % 39.3 %

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