PPS (polyphenylene sulfide)
Uniquely Kashima
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PPS is a material with unique features which make it fairly popular for plastic bearings.
(See tables below.)
Overview of PPS
PPS (polyphenylene sulfide) is a crystalline, high-performance plastic used extensively in engineering. It consists of a benzene ring from the Phenyl group (PP), alternating repeatedly with a sulfur molecule (S).
Enjoying excellent heat resistance, it can be used for quite a long time in high temperatures. With excellent chemical-resistance up to 200℃, it will not dissolve in oil, fat, or other solvent.
Other strengths include flame-retardancy and tensile-strength. Plus, there is high dimensional stability and low amounts of shrinkage at the time of molding,
However, the qualities also result in some weaknesses: less toughness (weak under impact) and poor weather-resistance. At the time of molding, the Barie amount will be prominently noted.
※ Weather-resistance refers to a property of plastics, paints, etc. that prevents or reduces deformation, discoloration, et al. when used outdoors.
Features of PPS
◎ 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 | ||||||||
PPS | PS | ○ | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ |
PSG | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ | × |
NOTE: For chemicals, please consult us regarding the type and concentration, etc. of such.
Temperature Resistance of PPS
☆ Best Recommended ◎ Highly Recommended ○ Recommended
△ Not Recommended × Do Not Use
Material | Call symbol |
Temperature | |||||||
---|---|---|---|---|---|---|---|---|---|
-190℃~ | -100℃~ | -50℃~ | -20℃~ | Room temperature ~60℃ |
~120℃ | ~200℃ | ~350℃ | ||
PPS | PS | × | × | × | ○ | ☆ | ◎ | ○ | × |
PSG | × | × | × | ○ | ☆ | ◎ | ○ | × |
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.