PSU is Widely Used For:

  • Medical instrument components
  • Manifolds
  • Medical trays
  • Autoclavable instruments and trays

Performance Characteristics:

  • Semi-transparent plastic
  • Resists hydrolysis when exposed to hot water or steam
  • Strong and stiff
  • Can be used at higher temperatures than acrylic or polycarbonate
  • Thermoformable

Common Brands:

  • Sustason PSU


High temperature, semi-transparent plastic material with good mechanical properties

PSU (polysulfone) is a high temperature, amber colored, semi-transparent plastic material with good mechanical properties. 

Polysulfone is resistant to degradation from hot water and steam and it is often used in medical and food preparation applications where repeated sterilization is required. 

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

Shop for PSU


SHEET Dimensions:
24 in x 24 in – 24 in x 48 in
0.375 in – 2.500 in
ROD Outside Diameter:
0.250 in – 4 in
COLOR Natural

Length, width, thickness, and diameter tolerances vary by size, by manufacturer, brand, and grade. Custom sizes available upon request.


Typical properties of PSU
Tensile strength psi D638 10,200
Flexural modulus psi D790 390,000
Izod impact (notched) ft-lbs/in of notch D256 1.3
Heat deflection temperature @ 264 psi °F D648 345
Maximum continuous service temperature in air °F   285
Water absorption (immersion 24 hours) % D570 0.30
Coefficient of linear thermal expansion in/in/°Fx10-5 D696 3.1

Values may vary according to brand name. Please ask your Curbell Plastics representative for more specific information about an individual brand.

Need more information about this material? Use our interactive plastic properties table