Poly­ether­sul­fone (pol­yaryl­sul­fone) [Radel A®]


  • Heat-resistant, trans­par­ent, amber, non­crys­talline engi­neer­ing plastic
  • Tough and rigid resin sim­i­lar to con­ven­tional engi­neer­ing plastics
  • Flame-resistant
  • Supe­rior high-temperature prop­er­ties than con­ven­tional engi­neer­ing plastics
  • Remains in sat­is­fac­tory con­di­tion in long-term con­tin­u­ous use with­out dimen­sional change or dete­ri­o­ra­tion at tem­per­a­tures as high as 200ºC.
  • Mold­able
  • Hydrolyt­i­cally stable
  • Chemical-resistant
  • Avail­able in amber trans­par­ent, opaque col­ors and glass-filled grades

Com­mon uses

  • Light­ing fixtures
  • Elec­tri­cal and elec­tronic components
  • Sur­gi­cal and med­ical devices
  • Chem­i­cal process equipment
  • Auto­mo­tive components
  • Food ser­vice components


Mate­r­ial Specifications

ASTM or UL test Prop­erty Value
D792 Den­sity (lb/in3)/(g/cm3) 0.050 (1.37)
D570 Water absorp­tion, 24 hrs (%) 0.54
D638 Ten­sile strength (psi) 12,200
D638 Ten­sile mod­u­lus (psi) 385,000
D638 Ten­sile elon­ga­tion at break (%) 6.5
D790 Flex­ural strength (psi) 16,100
D790 Flex­ural mod­u­lus (psi) 420,000
D785 Hard­ness, Rockwell 127
D256 Izod notched impact (ft-lb/in) 1.6
D3418 Melt­ing temp (F°/C°) - / -
D696 Coef­fi­cient of lin­ear ther­mal
expan­sion (x 10–5 in./in./°F)
D648 Heat deflec­tion temp (F°) at 264 psi 400/204
- Max oper­at­ing temp (F°/C°) 320/160
C177 Ther­mal con­duc­tiv­ity
UL94 Flam­ma­bil­ity rating V-O
D150 Dielec­tric con­stant at 1 KHz 3.5
D150 Dis­si­pa­tion fac­tor at 1 KHz 0.0022
D149 Dielec­tric strength (V/mil) 380
D257 Vol­ume resis­tiv­ity (ohm/cm) at 50% RH 1.7 x 1015

These are typ­i­cal val­ues for ref­er­ence and com­par­i­son only. They should not be used as a basis for design spec­i­fi­ca­tions or qual­ity con­trol. Con­tact us for the man­u­fac­tur­ers’ com­plete mate­r­ial prop­erty datasheets. All val­ues were taken at 73°F (23°C) unless oth­er­wise noted.

Don’t see what you’re look­ing for? Call us at 800–423-2769 or email us at tom@crownplasticsinc.com.