... widely used in the fire door and insulation work.The board is an environmental protection production.It`s a kind of ... and insulation material.Features and advantage1,environmental protection,non-poisonous,zero radioactivity2,fire proof,keep warm,moistureproof3,Corrosion Free,rustlessAs ... is cut under control by computer, making it a whole board to put into doorframe, no extra cutting or assembling ...