PEEK (polyether ether ketone)
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PEEK is a material with special features which make it very popular for plastic bearings.
(See tables below.)
Overview of PEEK
PEEK is a crystalline thermoplastic. It is a type of special, synthetic aromatic-polyetherketone.
PEK (polyetherketone) has a basic straight chain-structure consisting of alternating ether and ketone bonds.
PEEK (polyetheretherketone) is created by inserting another ether molecule into the chain.
This gives it a very high heat-resistance, excellent fatigue-resistance, tough abrasion-resistance, strong dimensional stability, as well as terrific chemical-resistance.
It also offers excellent insulation and radiation-resistance, but it is a fairly pricey material.
Features of PEEK
◎ Highly Recommended ○ Recommended
△ Not Recommended × Do Not Use
| Material | Call symbol |
Dry | Irregular moisture |
In water / In sea-water |
Vapor | Chemical | Non- magnetic |
Insulating | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Acid | Alkali | Organic solvent |
Oil | ||||||||
| PEEK | PK | ○ | ○ | ○ | ○ | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ |
| PKG | ◎ | ○ | ○ | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ | × | |
NOTE: For chemicals, please consult us regarding the type and concentration, etc. of such.
Temperature Resistance of PEEK
☆ Best Recommended ◎ Highly Recommended ○ Recommended
△ Not Recommended × Do Not Use
| Material | Call symbol |
Temperature | |||||||
|---|---|---|---|---|---|---|---|---|---|
| -190℃～ | -100℃～ | -50℃～ | -20℃～ | Room temperature ～60℃ |
～120℃ | ～200℃ | ～350℃ | ||
| PEEK | PK | × | × | ○ | ◎ | ☆ | ◎ | ○ | × |
| PKG | × | × | ○ | ◎ | ☆ | ◎ | ◎ | × | |
NOTE: the shape of the bearing will change due to such temperatures.
For more information about tolerances and other issues, download a catalogue from here.