Is made up of specially treated and crystal water gypsum material, which determines that at the beginning period when it meets fire, before the crystal water in the board core fully comes out and vapors up, the temperature at the board surface cannot exceed 140°C. This good fire resistant property can obtain valuable time for people to evacuate. Meanwhile prolong the fireproof time. The paper-faced gypsum board release vapor when it is heated, sothat it avoids the dangers ofuffocaing people due to breathing in poisonous gas from fire.