High-Performance Thermoplastic

PEEK (Polyether Ether Ketone)

PEEK is a semi-crystalline high-performance thermoplastic that keeps its mechanical properties at high temperatures and resists most chemicals, hydrolysis, and radiation. It replaces metal in demanding applications where weight, insulation, or chemical exposure matter. Request a quote or browse all materials.

Typical Properties

PEEK at a glance

Property	Typical value
Density	~1.30–1.32 g/cm³
Tensile strength	~95–100 MPa
Tensile modulus	~3.6–4.0 GPa
Elongation at break	~20–40%
Glass transition	~143 °C
Melting point	~343 °C
Heat deflection (1.8 MPa)	~150–160 °C
Continuous service temperature	~250 °C

Unfilled grade values. Glass- and carbon-filled PEEK are stiffer and stronger; bearing grades add PTFE and graphite. These are typical reference values from standard published data, not guaranteed minimums. Request material certificates in your RFQ if properties must be verified.

Advantages

Why engineers choose PEEK

Heat resistance

Useful well above most engineering plastics.

Chemical resistance

Resists most acids, bases, solvents, steam, and hydrolysis.

Wear

Good wear and friction behavior, especially in bearing grades.

Low outgassing

Used in vacuum and semiconductor applications (grade dependent).

Design considerations: High material cost; machining requires stress management to hold flatness; medical or implant grades need specific certified stock.

Applications

Common uses

Semiconductor wafer handling partsValve seats and sealsBushings and wear padsElectrical insulatorsMedical instrument components (non-implant, grade specific)

Processes and Finishes