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Mechanical/ Packing/ Gasket Seal: The materials of mechanical seal are graphite, ceramic, slicon carbide, nitrile rubber, nitrile rubber hydride, fluoro carbon rubber, chromium-nickel steel, etc. The materials of packing seal are graphite, PTFE, asbestos, etc. Because of different size and standard, please contact us in time. The common materials of gasket seal are rubber, leather, asbestos, cork, PTFE, steel, iron, copper, stainless steel, etc. Size Range: Φ16 mm~Φ3000 mm.