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PEEK is partially crystalline, and has a [[glass transition temperature]] of 143°C, a melting temperature of 334°C and is highly resistant to thermal degradation. The material is also resistant to both organic and aqueous environments, and is used in bearings, piston parts, pumps, compressor plate valves, and cable insulation applications.
PEEK is considered an advanced biomaterial used in medical implants, often in reinforced format using biocompatable fibre fillers such as carbon. Also in carbon fibre reinforced form, it has also come under consideration as an aerospace structural material due to high strength-to-weight ratio.
=== Chemical Resistance ===
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