Mating surface: steel, steel chrome-plated, stainless steel, aluminum, ceramic coating, steel hardened, anodized aluminium, cast iron, premium steel Purpose: very high abrasion resistance; lubricating & non-lubricating hydraulic fluids; gas, dry air pneumatic, water-based fluids; Limited temperature; strong lips with very good wiping effect; FDA compliant Information provided by Angst + Pfister |