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ASME B16.5 slip-on (S/O) flanges with raised face (RF), 10″ Class 150. Material: ASTM A105N forged steel. Anti-rust oil coating are applied on the surface of the flange. The anti-rust oil is a light corrosion inhibitor which effectively prevents or inhibits possible corrosive reactions between the carbon steel flanges and the ambient environments (water, oxygen, etc) during delivery and storage.