1、pom/pa plastic bearings material pom and pa have excellent mechanical strength and wearing resistance,is siutable for manufacturing precision plastic bearings.with good self-librication performance and low friction coefficients.in addition and high speed application.plastic bearing made with pom is the most extensive sort of all the plastic bearings.generally the inner and outer rings made with pom or pa,cage made with pa and the balls made with glass,stainless or ceramic.these bearings could be used in some alkali environment but not proper to some acid environment. 2、hdpe/pp/upe plastic bearings hdpe、pp、upe are approved can be used in faintish acid and alkali environment.such bearings can operate in liquid and contamination sensitive environments as acid/alkali/salt/imprequant/oil/gas/seawater,have general performance of lubrication and maintenance free,none magnetism,antirust and eroded of plastic bearings.but these bearings have not strong mechanical strenth ang easy to be out of shape,so couldn't used in heavy load high speed aplication,amony these 3 material,upe moer excellent strength and low friction and could be used to lower temperature.generally the rings and cage made with hdp,pp or upe,balls made with glass stainless or ceramic. 3、peek/pi plastic bearings(high temperature application plastic bearings) 4、ptfe/pvdf plastic bearings(anti-corrosion plastic beareings) 5、plastic ball bearings for units and plastic ball bearing units