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Certifications ISO 13485:2016 | AS9100D | ITAR | FDA Registered | CAGE Code 5TTR7 

PSU

Polysulfone for CNC Machining

Polysulfone has excellent thermal and mechanical properties, making it ideal for applications that require frequent sterilization.

Updated: 8/20/26

Heat-resistant, translucent plastic with excellent mechanical characteristics

Polysulfone

Polysulfone, often referred to as PSU, is a high temperature, amber colored, semi-transparent plastic material with good mechanical properties. It's resistant to degradation from hot water and steam and it is commonly used in applications where repeated sterilization is required, such as the medical industry. 

PSU can be used as an alternative to polycarbonate or acrylic for applications requiring high temperature performance or exposure to hot water and steam.

Performance Characteristics

  • Resists hydrolysis in elevated temperatures
  • Strong and stiff
  • Semi-transparent

Common Brands

  • Sustason PSU
  • TECASON S

PSU Properties

  • Mechanical Properties
  • Thermal Properties
  • Electrical Properties
  • Optical Properties
  • Mechanical Properties

    Tensile Strength 10,200 psi
    Tensile Modulus of Elasticity 360,000 psi
    Tensile Elongation 50 - 100%
    Flexural Strength 15,400 psi
    Flexural Modulus of Elasticity 390,000 psi
    Compressive Strength 13,900 psi
    Hardness (Rockwell) R125
    Izod Impact 1.3 ft-lbs/in

  • Thermal Properties

    Coefficient of Linear Thermal Expansion 3.1 in/in/°F x 10-5
    Heat Deflection Temperature (66 psi/264 psi) 358 / 345 °F
    Max Continuous Service Temperature in Air 285 °F

  • Electrical Properties

    Dielectric Strength 425 V/mil

  • Optical Properties

    Light Transmittance -- %
    Haze -- %