Columbia Chemical’s unique all trivalent passivating conversion coating for electroplated zinc nickel alloy is now part GM’s limited list of approved finishers for zinc nickel. COLDIP NI-Z TRI BLUE 100 with Zinc-Chro-PELLENT meets all of the GMW 4700B specification minimum requirements including 240 hours to white corrosion, 1,000 hours to red corrosion and 60 cycles of the cyclic test.

Columbia Chemical Corporation is one of the world’s largest manufacturers of zinc plating additives. For more information, contact Columbia Chemical Corporation, 1000 Western Drive, Brunswick, OH 44212, 330/225-3200,