... rubber,plastic,nylon,hdpe 2.used in coal,mine,steel,cement,harbor coal mine rubber conveyor belt idler roller ... stainless steel,nylon,plastic,ceramic,hdpe, uhmw-peUsageUsed in coal,mine,steel,cement,harbor,crusher heavy industryRoller FeatureLow vibration, ... set of testsLoad capacity testsWear testsSealing against dust and water testsStart and run resistance testsIdler Roller Components:Our Factory ...