Polyether ether ketone, also simply known as PEEK, is an organic polymer
thermoplastic with excellent mechanical and chemical resistance properties that
are retained through higher temperature applications. Because of these inherent
properties, PEEK is an ideal material for use as a magnetic stir bar in high
mechanical stress induced applications for its abrasion resistance or when
chemical attacks are a concern.
Excellent chemical resistance at high
Excellent high temperature performance
for all mechanical properties
Excellent wear and abrasion resistance
at high temperatures
Excellent hydrolysis resistance at
Excellent gamma radiation resistance
The thermal oxidative
stability of PEEK is excellent and the material has an
UL-rated continuous operating temperature of around 250oC
(depending on the grade used). PEEK has excellent
resistance to burning and very low flame spread being rated
as UL 94 V-0 for thicknesses down to 2 mm. The LOI (Limiting
Oxygen Index) is 35% (depending on grade) and even when
burning the material has one of the lowest smoke generation
characteristics of the engineering thermoplastics.
PEEK has outstanding chemical resistance and is extremely resistant to most
organic and inorganic chemicals. It is dissolved or decomposed only by
concentrated anhydrous or strong oxidizing agents. The material has
exceptionally good resistance to hydrolysis in hot water and remains unaffected
after several thousand hours at more than 250oC in pressurized water. PEEK is
not greatly resistant to UV radiation but has good resistance to beta and
X-rays, as well as exceptional resistance to gamma rays (more than 1000 Mrad
without significant loss in mechanical properties). These properties allow for
ease of sterilization, and coupled with good biocompatibility (USP Class VI),
PEEK makes a strong candidate for medical applications.
here for a comprehensive chemical resistance chart.
Physical and Mechanical
PEEK has greater strength and rigidity than many of the other engineering
thermoplastics, making it tough over a wide range of temperatures.
It has good mechanical properties, including impact resistance, low wear rate,
and a low coefficient of friction, but more importantly, these properties are
also retained over a wide temperature range.