Polyetheretherketone
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Polyetheretherketones (PEEK), also referred to as polyketones, are obtained from aromatic dihalides and bisphenolate salts by nucleophilic substitution. The bisphenolate salt is formed in situ from bisphenol and either added sodium or added alkali metal carbonate or hydroxide.
PEEK is partially crystalline, and has a glass transition temperature of 143 °C and a melting temperature of 334 °C. The material is resistant to both organic and aqueous environments, and is used in bearings, piston parts, pumps, compressor plate valves, and cable insulation applications.
PEEK is an abbreviation for PolyEtherEther-Ketone, a high performance engineering thermoplastic. PEEK 450G (aka Victrex PEEK 450G) 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. Victrex 450G PEEK carries a V-0 flammability rating and exhibits very low smoke and toxic gas emission when exposed to flame.
PEEK is a thermoplastic with extraordinary mechanical properties. The Young's Modulus is 3.6 GPa and its tensile strength 170 MPa.
PEEK is also considered an advanced biomaterial used in medical implants.
| PEEK | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Density | 1300 kg/m3 | ||||||||||||||||||||
| Young's modulus(E) | 3700 MPa | ||||||||||||||||||||
Tensile strength(σt)</td>| 90 MPa | </tr>
Elongation @ break | 50% | notch test | 55 kJ/m2</td></tr>
|
Glass temperature | 143°C | melting point | 334°C | Vicat B | - | heat transfer coefficient (λ) | 0.25 W/m.K | linear expansion coefficient (α) | 1.7 10-5 /K</td></tr>
|
Specific heat (c) | - kJ/kg.K | Water absorption (ASTM) | - | Price | 25-50 €/kg |
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