PB-970 is the Process by which the metal is given a black Coating. It is used for M.S. Casting , ferrous surface. 100% chemical used for 100 litres of bath. The time for dipping is 15-20 min. at 140 to 160 °C temperature.
PB - 990 Process by which the metal is given a black Coating. It is used for M.S Casting, Ferrous Surfaces. 100% Chemica... Continue