PPSU is Widely Used For:

  • Aircraft interior parts
  • Aircraft bezels
  • Instrument handles
  • Medical instrument components
  • Sterilization trays
  • Implant trials

Performance Characteristics:

  • Extremely high impact resistance
  • Resistant to hydrolysis when exposed
    to hot water and steam
  • Can withstand repeated sterilization
    cycles in a steam autoclave
  • Thermoforms well

Common Brands: 

  • Radel® R


High temperature thermoplastic material with outstanding impact resistance that is autoclavable

PPSU (polyphenylsulfone) (Radel® R) is a high temperature thermoplastic material with outstanding impact resistance. Radel® R is resistant to hot water and steam and can withstand repeated cycles in a steam autoclave. FDA compliant grades of PPSU are available. For PPSU chemical resistance view our chart.

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SHEET Dimensions:
24 in x 48 in
0.500 in – 2 in
ROD Outside Diameter:
0.375 in – 3.500 in

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

PPSU Properties and Material Options

Radel® R-5500– is a general purpose extrusion grade of polyphenylsulfone (PPSU) offering exceptional hydrolytic stability and better toughness than most commercially available high temperature polymers.

Tech Tip– PPSU is often used instead of polysulfone or Ultem® for medical applications when superior toughness or extended service life with repeated autoclave cycles is desired.


Typical properties of PPSU
Tensile strength psi D638 10,100
Flexural modulus psi D790 350,000
Izod impact (notched) ft-lbs/in of notch D256 13.0
Heat deflection temperature @ 264 psi °F D648 405
Maximum continuous service temperature in air °F   392
Water absorption (immersion 24 hours) % D570 0.37
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.

Explore the physical, mechanical, thermal, electrical, and optical properties of PPSU.

Sort, compare, and find the plastic material suited for your application using our interactive properties table.


PPSU RADEL® R Properties Charts: Impact Resistance, HDT (Heat Deflection Temperature) and Steam Autoclave Resistance