Plastics are excellent bushing material that replace metal. In contract to metal, plastic bearings are self-lubricating, require less grease or maintenance, and last longer. Typically six different plastic materials could be used as these bushings and each will be described.
Called “Redco 750 XL” this is a lubrication impregnated polyurethane bearing material. It’s used where shock and vibration are special factors. It has the advantage of being able to be molded which means a low per-piece cost when purchased in bulk.
The most common bearing material in a sawmill, nylon takes high pressure (4000 PSI) and is available in solid and liquid lubrication impregnated versions. High temperature formulas are also available.
Perhaps the least common material used in sawmills, acetal replaces nylon in moisture-rich or submerged environments as nylon suffers from moisture absorption issues unlike most plastics.
Typically used under the highest load or highest heat applications.
Used where extreme heat or extreme chemical exposure occurs but where a light duty (500 PSI or less) bearing material will suffice.
No moisture absorption and is good for light load applications.
If you’re interested in more information or a quotation please contact Redwood Plastics and Rubber.