Poly ether ether ketone (PEEK)
This is a semi-crystalline
polymer with high mechanical strength, thermal properties up to 240 °c, creep
resistance under load, wear resistance and low coefficient of friction.
N.B. Its high temperature
resistance is reduced by the addition of even limited load.
Thermal stability beyond
Good chemical resistance
High dimensional stability
Good abrasion resistance
and low friction coefficient
Very high rigidity also at
Very high cost
No inherently UV stability
Relatively low notch impact
decreases to as low as 140°c under
Low resistance to acetone
resistance, dimensional stability at temperatures and high wear resistance make
it a good choice for high performance pieces at low temperatures as well as
high temperatures, e.g. gear bushes, in aircraft and aerospace industries.
Electrical: Very good
dielectric and insulation properties.
Used for valve seals, pump housings due to very good chemical resistance.
Nuclear: High resistance
to Gamma radiation is particularly suited to nuclear applications.