PEEK (poly­etheretherkey­tone) [Tecapeek®]


  • Semi-crystalline, high-temperature engi­neer­ing thermoplastic
  • Excel­lent flex­ural, impact and ten­sile characteristics
  • Very high con­tin­u­ous work­ing temperature
  • Very high heat dis­tor­tion temperature
  • Excel­lent chem­i­cal resistance
  • Insol­u­ble in all com­mon solvents
  • Radiation-resistant
  • Wear– and abrasion-resistant
  • Low smoke and toxic gas emissions
  • Hydrolysis-resistant
  • Avail­able in nat­ural and black

Com­mon uses

  • Indus­trial
  • Auto­mo­tive, marine, nuclear, oil well, elec­tron­ics, med­ical and aero­space fields
  • Unfilled PEEK is FDA-approved for use with food


Mate­r­ial Specifications

ASTM or UL test Prop­erty Value
D792 Den­sity (lb/in3)/(g/cm3) 0.0477 (1.31)
D570 Water absorp­tion, 24 hrs (%) 0.10
D638 Ten­sile strength (psi) 16,000
D638 Ten­sile modulus -
D638 Ten­sile elon­ga­tion at break (%) 20
D790 Flex­ural strength (psi) 25,000
D790 Flex­ural mod­u­lus (psi) 600,000
D785 Hard­ness, Rockwell 126
D256 Izod notched impact (ft-lb/in) 1.0
D3418 Melt­ing temp (F°/C°) 644/340
D696 Coef­fi­cient of lin­ear ther­mal
expan­sion (x 10–5 in./in./°F)
D648 Heat deflec­tion temp (F°/C°) at 264 psi -
- Max oper­at­ing temp (F°/C°) 480/249
C177 Ther­mal con­duc­tiv­ity
UL94 Flam­ma­bil­ity rating V-O
D150 Dielec­tric con­stant at 1 MHz 3.30
D150 Dis­si­pa­tion fac­tor at 1 MHz 0.003
D149 Dielec­tric strength (V/mil)
short time, ⅛” thick
D257 Vol­ume resis­tiv­ity (ohm/cm) at 50% RH 4.9 x1018

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.

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*Tecapeek® is a reg­is­tered trade­mark of Ensinger.