Technical datasheet

PES POLYETHERSULFONE

Supplied byWestlake Plastics- Last Updated on Aug 27, 2025

PES POLYETHERSULFONE by Westlake Plastics is a high heat resistant polyethersulfone (PESU) grade. Is an easily machined grade, exhibiting low smoke generation, excellent chemical resistance and electrical properties at elevated temperatures such as high dielectric strength. Possesses good impact resistance and dimensional stability. Designed for extrusion method. PES POLYETHERSULFONE is recommended for machine guards, electrical like connectors, electronics such as printed circuits and high intensity light bases, aerospace & aircraft, automotive and mass transit industries. Can also be used for heat and fire safety like face shields, food service and hospital & health care applications. Complies with UL 94 V-0 Flame Rating.
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Benefits

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PES POLYETHERSULFONE properties

Electrical properties

PropertiesValue & unitTest conditionTest method
Dielectric Constant0.0 Visible After LoginVisible After LoginVisible After Login
Dielectric Strength0.0 Visible After LoginVisible After LoginVisible After Login
Dissipation Factor0.0 Visible After LoginVisible After LoginVisible After Login
Volume Resistivity0.0 Visible After LoginVisible After LoginVisible After Login

Flammability properties

PropertiesValue & unitTest conditionTest method
Flame rating (UL 94)0.0 Visible After LoginVisible After LoginVisible After Login
Limiting Oxygen Index (LOI)0.0 Visible After LoginVisible After LoginVisible After Login

Mechanical properties

PropertiesValue & unitTest conditionTest method
Compressive Modulus0.0 Visible After LoginVisible After LoginVisible After Login
Compressive Strength0.0 Visible After LoginVisible After LoginVisible After Login
Elongation at Break0.0 Visible After LoginVisible After LoginVisible After Login
Elongation at Yield0.0 Visible After LoginVisible After LoginVisible After Login
Flexural Modulus0.0 Visible After LoginVisible After LoginVisible After Login
Flexural Strength at Yield0.0 Visible After LoginVisible After LoginVisible After Login
Hardness, Rockwell R0.0 Visible After LoginVisible After LoginVisible After Login
Impact Strength, Notched Izod0.0 Visible After LoginVisible After LoginVisible After Login
Impact Strength, Unnotched Izod0.0 Visible After LoginVisible After LoginVisible After Login
Modulus of Elasticity0.0 Visible After LoginVisible After LoginVisible After Login

Optical properties

PropertiesValue & unitTest conditionTest method
Haze0.0 Visible After LoginVisible After LoginVisible After Login
Transparency0.0 Visible After LoginVisible After LoginVisible After Login

Other properties

PropertiesValue & unitTest conditionTest method
Tensile Strength at Yield0.0 Visible After LoginVisible After LoginVisible After Login

Physical properties

PropertiesValue & unitTest conditionTest method
Specific Gravity0.0 Visible After LoginVisible After LoginVisible After Login
Water Absorption0.0 Visible After LoginVisible After LoginVisible After Login

Thermal properties

PropertiesValue & unitTest conditionTest method
CTE, Linear, Parallel to Flow0.0 Visible After LoginVisible After LoginVisible After Login
Deflection Temperature at 0.46 MPa (66 psi)0.0 Visible After LoginVisible After LoginVisible After Login
Deflection Temperature at 1.8 MPa (264 psi)0.0 Visible After LoginVisible After LoginVisible After Login
Thermal Conductivity0.0 Visible After LoginVisible After LoginVisible After Login

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