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Radel® R is an extruded form of polyphenylsulfone (PPSU) that offers higher impact resistance and has superior hydrolysis resistance than other amorphous materials, including both polysulfone (PSU) and polyetherimide (PEI).

Radel® R PolyArylEtherSulfone or PAES (also known as Polyphenylsulfone or PPSU) withstands virtually unlimited steam sterilizability, outlasting other materials by a factor of 40:1. This factor makes it an excellent choice for medical devices which are constantly subjected to sterilization in steam autoclaves. Radel® R also resists common acids and bases, including commercial washing solutions, over a broad temperature range. Its heat deflection temperature of 400°F (205°C) makes it suitable for use in electronic assembly equipment and devices that must withstand solder temperatures.

Radel® R is available in amber (translucent), natural (bone white), and custom colors. Radel® R is USP Class VI compliant.

Engineering note: Although Radel® R has been approved for use in a variety of medical devices, it is not FDA compliant and therefore not appropriate for food contact applications. Radel is not a wear material, and its properties degrade when exposed to sunlight.

Brand Names

  • Radel® R-5500
  • RAdel® R-7700

Emco Industrial Plastics doesn’t claim to represent all of the manufacturers or trade name products listed. This list is intended as a guide of typical materials available for purchase from Emco Industrial Plastics, Inc. For additional information, contact an Emco Industrial Plastics representative by filling out the form below.

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At a Glance

Generic Name
PolyArylEtherSulfone, PPSU

Available In
Sheet, Rod

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Technical Information

Stock Products Properties Applications Advantages

Stock Products

Sheet 1/4″ – 3″ TH Up to 24″ x 48″; CTS Natural (White), Black; Custom Colors
Rod 1/4″ – 6″ DIA Natural (White), Black; Custom Colors

Give us your cut-to-size dimensions. We will precision-cut these plastics to your exact size. Additional sizes and colors available upon request.


Physical PropertiesUnitsASTMResults
Density lb/in³ D792 0.047
Water Absorption, 24 hrs % D570 0.4
Mechanical PropertiesUnitsASTMResults
Tensile Strength @Yield psi D638 11000
Tensile Modulus psi D638 340000
Tensile Elongation @Yield % D638 30
Flexural Strength psi D790 15500
Flexural Modulus psi 400000 345000
Compressive Strength psi D695 13400
Compressive Modulus psi D695 280000
Hardness, Rockwell R D785 R120/M80
IZOD Impact Strength Notched ft-lb/in D256 2.5
Thermal PropertiesUnitsASTMResults
Coefficient of Linear Thermal Expansion (x 10⁻⁵ in./in./°F) D256 3.1
Heat Deflection Temp at 264 psi °F 405
Melting Temperature °F D3418 428
Max Operating Temp °F 300
Thermal Conductivity BTU-in/ft²-hr-°F C177 2.4
Flammability Rating UL94 V – O
Electrical PropertiesUnitsASTMResults
Dielectric Strength V/mil D149 360
Dielectric Constant @ 1 KHz D150 3.44
Dissipation Factor @ 1 KHz D150 0.0017
Volume Resistivity, 50% RH ohm-cm D257 >10¹⁵

NOTE: The property values presented above are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers’ complete material property datasheets. All values at 73°F (23°C) unless otherwise noted.


  • Wire and cable insulation
  • Commercial aircraft interiors
  • Medical wands, devices
  • Plumbing fittings, manifolds
  • Good processability allowing for complex design


  • Exceptional hydrolytic stability
  • Good chemical resistance
  • Transparent; colorable
  • Steam sterilizable with better retention of impact properties
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