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PEEK

 
GENERAL PROPERTIES
PEEK Material (c) Boedeker Plastics 2001PEEK 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 GRADES
PEEK (Unfilled)
This general purpose grade is unreinforced and offers the highest elongation and toughness of all PEEK grades. This material is available in Natural color (a very light brown or tan -- see photo above), but 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 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.
Other Specialty Grades Now Available: 
( see also high-temperature PEEK HT, bearing grade Ketron HPV, and static-dissipative Semitron ESd 480 Specifications )

 

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TYPICAL PROPERTIES of EXTRUDED PEEK 
(compression molded and injection molded versions also available) 
ASTM or UL test Property Unfilled 30% Glass Fibers 30% Carbon Fibers Bearing Grade
PHYSICAL
D792 Density (lb/in³)
(g/cm³)
0.047
1.31
0.056
1.54
0.051
1.41
0.052
1.44
D570 Water Absorption, 24 hrs (%) 0.10 0.10 0.06 0.05
MECHANICAL
D638 Tensile Strength (psi) 16,000 18,000 26,000 11,000
D638 Tensile Modulus (psi) 500,000 1,000,000 1,400,000 850,000
D638 Tensile Elongation at Break (%) 20 3 1 2
D790 Flexural Strength (psi) 25,000 28,000 38,000 27,500
D790 Flexural Modulus (psi) 600,000 1,000,000 1,700,000 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 M103 M104 M85
D256 IZOD Impact Notched (ft-lb/in) 1.0 1.4 1.5 0.7
THERMAL
D696 Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
2.6 1.2 1.0 1.7
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
C177 Thermal Conductivity
(BTU-in/ft²-hr-°F)
(x 10-4cal/cm-sec-°C)

1.75
6.03

2.98
10.3

6.4
22.0

1.7
5.9
UL94 Flammability Rating V-0 V-0 V-0 V-0
ELECTRICAL
D149 Dielectric Strength (V/mil) short time, 1/8" thick 480 500 32 -
D150 Dielectric Constant at 1 MHz 3.30 - - -
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