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smoke\poison are the best dangerous bad factors. Proved by practice; the fire death of above 85% is aroused by breathing the smoke fog and poisonous smoke. For reduce the death-rate for smoking poison, prevent the poisonous smoke dust from spreading around through the openings across the walls of wire\cable etc...Shengzhou Cable Fireroof Equipments and Materials Factory have tackled key technical problem, succeeded in developing EFB type organic fireproof blockage. It is characterized in good flame retradant property; good flexibility in low temperature; not releasing halide acid gas and low smoke fog. Meeting flame, it doesn't produce irritative gas and smoke fog, for fear the poisonous gas infract the body and corrupt the electrical swith and equipments. The certain expansion competence is more reliable for sealed effect of flame and smoke.