| 摘要 |
PROBLEM TO BE SOLVED: To provide a construction board having fire prevention and high strength. SOLUTION: A hydraulic setting inorganic material is added to a wooden board adhering wafer/a strand to impart fire prevention, and material which has the large surface area of Blaine value of 3000 cm<2> /g or higher as hydraulic setting inorganic material so as not to lower the strength of a board and has high reaction is selected. The hydraulic setting inorganic raw material of 100-250 pts.wt. is added. The strand is orientated in the prescribed direction. The hydraulic setting inorganic raw material is Portland cement, silica fume of 0-20 wt.% is contained in the hydraulic setting inorganic raw material. An adhesive is heat resistant and alkaline resistant adhesive. |
