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Polyethersulfone (PES) is a high temperature amorphous thermoplastic offering a superior combination of better chemical resistance and higher dry heat capability than polysulfone (Udel®) or polyetherimide (Ultem®).

Radel® A PolyEtherSulfone or PES (also known as PolyArylEtherSulfone or PAES) provides a greater margin of performance in such areas as toughness in comparison with other plastics. High resistance to heat and combustibility, low smoke emission, and transparency are the combination of properties possessed by components made from PES. These, coupled with light weight, good impact resistance, dimensional stability, and chemical resistance, make PES useful in the electrical/electronics, aerospace/aircraft, automotive, and mass transit industries.

Radel® A is FDA approved and NSF and UL listed. It is available in amber transparent and opaque colors. Glass-fiber reinforced polyethersulfone grades are also available. The addition of glass fibers increases the rigidity, tensile strength, creep resistance, dimensional stability, and chemical resistance of the material. Glass-filled PES is opaque, grayish in color.

Brand Names

  • Ultrason®
  • Victrex®
  • Astrel®

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
Polyethersulfone, Glass Filled

Available In
Sheet, Rod, Film, Other

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Technical Information

Stock Products Properties Applications Advantages Grades

Stock Products

Sheet .030″ – 4″ TH Up to 24″ x 48″; CTS Transparent Amber, White, Opaque colors
Rod 3/8″ – 6″ DIA Transparent Amber, White, Opaque colors
Film 0.001″ – 0.029″ TH Up to 27″ wide roll width; Length CTS Transparent Amber, White, Opaque colors
Other Hex rod; Custom machined parts

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 0.057
Water Absorption, 24 hrs % D570 0.39
Mechanical PropertiesUnitsASTMResults
Tensile Strength @Yield psi D638 18900
Tensile Modulus psi D638 825000
Tensile Elongation @Yield % D638 1.9
Flexural Strength psi D790 23500
Flexural Modulus psi 400000 950000
Compressive Strength psi D695 25600
Compressive Modulus psi D695 119000
Hardness, Rockwell R D785 R124/M80
IZOD Impact Strength Notched ft-lb/in D256 1.4
Thermal PropertiesUnitsASTMResults
Coefficient of Linear Thermal Expansion (x 10⁻⁵in./in./°F) D256 1.7
Heat Deflection Temp at 264 psi °F 420
Max Operating Temp °F 320
Thermal Conductivity BTU-in/ft²-hr-°F C177 1.35
Flammability Rating UL94 V – O
Electrical PropertiesUnitsASTMResults
Dielectric Strength V/mil D149 440
Dielectric Constant @ 1 KHz D150 4.1
Dissipation Factor @ 1 KHz D150 0.0018
Volume Resistivity, 50% RH ohm-cm D257 >10¹⁶

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.


  • Liquid crystal displays (film)
  • Electrical contacts, switches
  • Membranes for water purification
  • Medical equipment
  • Machine guards
  • Printed circuits
  • Connectors


  • Excellent electrical properties at elevated temperatures
  • Dimensional stability
  • Inherently flame retardant; low smoke emission
  • High impact resistance, mechanical strength, and toughness
  • Excellent chemical resistance
  • Transparency
  • Easily machined


  • Glass Filled
  • Carbon fiber Filled
  • Static Control – Dissipative

NOTE: Several grades of this material are available. For additional information regarding this plastic, contact your Emco Industrial Plastics representative or call 973-862-4148.

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