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Radel® A PESU Polyethersulfone
(PAS Polyarylsulfone) Specifications

904 West 6th Street, Shiner, Texas 77984 USA
Phone: 1-361-594-2941     Fax: 1-361-594-2349     E-Mail:


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Radel® A PESU (Polyethersulfone) 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®). Polyethersulfone may also be referred to as Polyarylsulfone.

Radel® A PolyEtherSulfone provides a greater margin of performance in such areas as toughness in comparison with other plastics. It has a high heat deflection temperature of 400°F (204°C), good hydrolytic stability, and chemical resistance to many commonly used acids and bases.

Radel® A is available in transparent, opaque as well as filled grades. It is used for lighting fixtures, electrical and electronic components, surgical and medical devices, chemical process equipment, automotive and food service components. Radel® A is FDA approved and NSF and UL listed. It is available in amber transparent and opaque colors.

Glass fiber reinforced polyethersulfone compounds 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 materials are opaque, grayish in color. Properties for the 30% glass filled grade are shown below for comparison.
( see also Conductive PESU CN and Radel R PAES Specifications )

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ASTM or UL test Property unfilled
30% glass

D792 Density (lb/in³)
D570 Water Absorption, 24 hrs (%) 0.54 0.39
D638 Tensile Strength (psi) 12,200 18,900
D638 Tensile Modulus (psi) 385,000 825,000
D638 Tensile Elongation at Yield (%) 6.5 1.9
D790 Flexural Strength (psi) 16,100 23,500
D790 Flexural Modulus (psi) 420,000 950,000
D695 Compressive Strength (psi) 14,500 25,600
D695 Compressive Modulus (psi) 388,00 1,119,000
D785 Hardness, Rockwell M88/R127 M80/R124
D256 IZOD Notched Impact (ft-lb/in) 1.6 1.4
D696 Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
2.7 1.7
D648 Heat Deflection Temp (°F / °C)
at 264 psi

400 / 204

420 / 215
D3418 Melting Temp (°F / °C) - / - - / -
- Max Operating Temp (°F / °C) 320 / 160 320 / 160
C177 Thermal Conductivity
(x 10-4 cal/cm-sec-°C)


UL94 Flammability Rating V0 V0
D149 Dielectric Strength (V/mil) short time, 1/8" thick 380 440
D150 Dielectric Constant at 1 KHz 3.5 4.1
D150 Dissipation Factor at 1 KHz 0.0022 0.0018
D257 Volume Resistivity (ohm-cm)at 50% RH 1.7 x 1015 > 1016

NOTE: The information contained herein 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.
RADEL and UDEL are registered trademarks of Solvay Advanced Polymers.
ULTEM is a registered trademark of General Electric Company.
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Boedeker Plastics, Inc.
904 West 6th Street, Shiner, Texas 77984 USA
USA TOLLFREE : 1-800-444-3485
Phone: 1-361-594-2941     Fax: 1-361-594-2349     E-Mail:

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