In the Hot Dip Galvalume process, Aluminium & Zinc coating is applied on the steel sheets to prevent from corrosion and other atmospheric reactions. In this process, steel is preheated to the level of Zinc + Aluminium bath temperature for Roofing Sheet (Hard Material). For soft materials, it is annealed at above critical temperature to get desired mechanical properties. An even coat consisting of 45% zinc & 55% aluminium is applied and to maintain the coating thickness, we have automatic air gap control through PLC. Furthermore, to prevent the coated surface, it passes through chromic acid to form a protective layer. Finished coils are then sent for color coating, corrugation/profiling or direct for dispatch as is.