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I Metal pretreatment chemicals 1 Degreasing chemicals 2 Derusting chemicals/desmuting chemicals/pickling chemicals 3 Phosphating chemicals a iron phosphating chemicals b calcium modified phosphating chemicals c tricationic phosphating chemicals d phosphating chemicals for oil surface, aluminium surface and cold forging surface 4 Passivation chemicals 5 Nano pretreatment chemicals 6 Blackening and bluing chemicals 7 rust converter 8 paint stripper/ remover 9 stainer
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