▎ 摘　　要

NOVELTY - Fire-proof door comprises 80-100 pts. wt. magnesium sulfate, 4-8 pts. wt. graphene, 15-25 pts. wt. magnesium oxide, 15-20 pts. wt. magnesium sulfate heptahydrate, 10-20 pts. wt. calcium carbonate, 5-10 pts. wt. aluminum borate, 5-8 pts. wt. wood material, 10-15 pts. wt. polymethyl methacrylate, and 0.6-1.2 pts. wt. methylcellulose. USE - The door is useful as fire-proof sealing, heat insulating and sound insulating materials. ADVANTAGE - The door has strong flame retardant property, compression and bending resistance, excellent heat resistance, excellent performance indexes and light weight.