Cold galvanizing flange or cold galvanized flange is the flange surface coated for a thin zinc, it is covered by electro galvanizing works, cold galvanizing also named electro galvanizing for flanges, the cold galvanizing coated thickness on flange was less than hot galvanized, so it is cheaper than hot galvanized coated flanges, but anti-rust time is also short than hot zinc covered on flanges.
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