PP (polypropylene)
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PP is a material with special features which make it quite popular for plastic bearings.
(See tables below.)
Overview of PP
PP (polypropylene) is the abbreviation of polypropylene. This is a plastic obtained by polymerizing propylene.
This material offers an especially strong feature: low specific gravity, so low that it can float in water. However, it has poor dyeing qualities, and it cannot resist high temperatures.
Features of PP
◎ 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 | ||||||||
| PP | PP | △ | ○ | ○ | △ | ○ | ○ | ○ | ○ | ◎ | ◎ |
NOTE: For chemicals, please consult us regarding the type and concentration, etc. of such.
Temperature Resistance of PP
☆ Best Recommended ◎ Highly Recommended ○ Recommended
△ Not Recommended × Do Not Use
| Material | Call symbol |
Temperature | |||||||
|---|---|---|---|---|---|---|---|---|---|
| -190℃～ | -100℃～ | -50℃～ | -20℃～ | Room temperature ～60℃ |
～120℃ | ～200℃ | ～350℃ | ||
| PP | PP | × | △ | ○ | ○ | ☆ | ○ | × | × |
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.