GENERAL PROPERTIESPEEK is an abbreviation for PolyEtherEther-Ketone, a high performance engineering thermoplastic. PEEK grades offer chemical and water resistance similar to PPS (PolyPhenylene Sulfide), but can operate at higher temperatures. PEEK can be used continuously to 480°F (250°C) and in hot water or steam without permanent loss in physical properties. For hostile environments, PEEK is a high strength alternative to fluoropolymers. PEEK carries a V-0 flammability rating and exhibits very low smoke and toxic gas emission when exposed to flame. And unfilled PEEK is approved by the FDA for food contact applications (since 1998).
FEATURES Excellent chemical resistance Very low moisture absorption Inherently good wear and abrasion resistance Unaffected by continuous exposure to hot water or steam
PEEK GRADESPEEK (Unfilled)
This general purpose grade is unreinforced and offers the highest elongation and toughness of all PEEK grades. Unfilled PEEK is available in sheet and rod forms in natural (a very light brown or tan) color (see photo above) and is also available in black . Black PEEK is ideal for instrument components where aesthetics are important, as well as for seal components where ductility and inertness are important. All unfilled PEEK grades comply with FDA regulation 21 CFR 177.2415 for repeated food contact.
PEEK (30% Glass Filled)
The addition of glass fibers significantly reduces the expansion rate and increases the flexural modulus of PEEK. This grade is ideal for structural applications that require improved strength, stiffness, or stability, especially at temperatures above 300°F (150°C). Glass-filled PEEK is light brown or tan in color.
PEEK (30% Carbon Filled)
The addition of carbon fibers enhances the compressive strength and stiffness of PEEK, and dramatically lowers its expansion rate. It offers designers optimum wear resistance and load carrying capability in a PEEK-based product. This grade provides 3½ times higher thermal conductivity than unreinforced PEEK -- dissipating heat from the bearing surface faster. Carbon-filled PEEK is black in color.
PEEK (Bearing Grade, Ketron HPV)
This grade of PEEK, containing carbon fiber reinforced with graphite and PTFE lubricants, offers the lowest coefficient of friction and the best machinability for all PEEK grades. Bearing grade PEEK has an excellent combination of low friction, low wear, high limiting PV, low mating part wear, and easy machining. Bearing grade PEEK is black or dark grey in color.
TYPICAL PROPERTIES of EXTRUDED PEEK
(compression molded and injection molded versions also available) updated 19May2008
|ASTM or UL test||Property||Unfilled||30% Glass Fibers||30% Carbon Fibers||Bearing Grade|
|D570||Water Absorption, 24 hrs (%)||0.10||0.10||0.06||0.05|
|D638||Tensile Strength (psi)||16,000||15,000||19,000||11,000|
|D638||Tensile Modulus (psi)||500,000||900,000||1,100,000||850,000|
|D638||Tensile Elongation at Break (%)||20||3||5||2|
|D790||Flexural Strength (psi)||25,000||28,000||25,750||27,500|
|D790||Flexural Modulus (psi)||600,000||1,000,000||1,250,000||1,100,000|
|D695||Compressive Strength (psi)||20,000||26,000||29,000||26,700|
|D695||Compressive Modulus (psi)||500,000||1,000,000||-||1,000,000|
|D785||Hardness, Rockwell||M100 (R126)||M103||M102||M85|
|D256||IZOD Impact Notched (ft-lb/in)||1.0||1.4||1.0||0.7|
|D696||Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
|D648||Heat Deflection Temp (°F / °C)
at 264 psi
320 / 160
600 / 315
550 / 288
383 / 195
|D3418||Melting Temp (°F / °C)||644 / 340||644 / 340||644 / 340||-|
|-||Max Operating Temp (°F / °C)||480 / 249||480 / 249||500 / 260||482 / 250|
(x 10-4 cal/cm-sec-°C)
|D149||Dielectric Strength (V/mil) short time, 1/8" thick||480||500||32||-|
|D150||Dielectric Constant at 1 MHz||3.30||3.70||-||-|
|D150||Dissipation Factor at 1 MHz||0.003||-||-||-|
|D257||Volume Resistivity (ohm-cm) at 50% RH||4.9 x 1016||5 x 1016||105||103|
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.PEEK is a trademark of Victrex USA, Inc.
All values at 73°F (23°C) unless otherwise noted.