1, the rings from dia35mm to 200mm are available 2, material : Ductile cast iron polybasic alloy cast iron WVTi alloy cast iron act. 3, surface treatment Ceramics CVD Chromium plating Plasma Spraying Gas Nitriding MoS2 Coating PTFE Coating Copper Plating Tin Plating Phosphating Oxiding Ceramics penetrating 4, annual turnout : piston ring: 60, 000, 000pcs valve seat inset:10, 000, 000pcs spiral spring: 40, 000, 000pcs 5, Quality policy: ISO9000 ISO14000 ISO/TS16949
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