| UHMWPE |
Ultra-high molecular weight polyethylene. Significantly improved wear and abrasion |
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resistance over PTFE-based materials in non-lubricated or abrasive media. FDA and |
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USDA 3A approved. Fair media compatibility, limited to approximately 90°C (198 °F) |
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| Nylon |
Improved strength, limited media compatibility and temperature resistance. Hydroscopic. |
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Used for plain bearings, bushings, back-up rings and some seals. |
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| POM |
Polyoxymethylene (a.k.a. polyacetal or just acetal). Similar to nylon but with |
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significantly reduced water-absorption properties. Some grades are FDA and |
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USDA 3A compliant. Typically used for plain bearings, bushings, and back-up rings. |
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| Ertalyte |
Similar to POM but offers improved media compatibility and improved wear resistance. |
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| PEEK |
Polyetheretherketone. Similar strength properties as nylon and POM but with very |
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good media compatibilty and significantly better temperature properties. Some |
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grades are FDA and USDA 3A compliant. Used for plain bearings, bushings, back-up |
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rings and some seals. |
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| PPS |
Polyphenylene sulphide. Similar strength properties and chemical compatibility as |
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PEEK-based compounds but offers improved wear resistance. Has better temperature |
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capabilities than nylon or POM materials but not as good as PEEK. Adding fillers can |
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create a "bearing-grade" PPS for hight-performance applications. |
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| PA |
Polyamide. Exceptional mechanical, thermal and chemical resistance properties. |
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