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with our polishing passivation technology, our 316 stainless steel products can stand a salt spray test of 300 hours with no rusting and our 304 stainless steel products can stand a salt spray test of 200 hours. different from acid washing, this technology make surface treatment to ss parts after polishing and all other treatments. this new technology is leading in the field and solves the problem of ss parts getting rusted with long time usage which cause poor look.