... no lubricant,maintain easily,operate smoothly,have least friction,and cause no damage to oponent ... applications quickly and successfully.In the field of abrasion, selflubrication,impaction,vibration,corrosion,nonsticking etc ... s the best material for the substitution of bronze and nonferrometal,stainless steel,other engineering ... noise,prolongs the life of screw and transportation belt. UHMWPE Pump parts