Enamel-specific boards and mechanical properties of the chemical composition of the adhesion of enamel layer is very important to improve the adhesion of enamel layer in the steel production process to add special ingredients to avoid scale explosions, bubbles, black points. Depot has been using a professional manufacturers of ceramic special board such as: Japan, South Korea, Taiwan, the production of SPP, Shanghai Baosteel produced BTC-1, BTC-3.