“倍安”牌建筑排水硬聚氯乙烯管防火圈 (以下简称“防火圈”)是由公安部上海消防科学研究所研制成功、上海倍安实业公司生产的新型阻燃耐火产品。该产品由金属材料制作外壳 ,内部填充阻燃膨胀芯材 ,套在UPVC管道外壁 ,固定在楼板或墙体部位。火灾发生时芯材受热迅速膨胀 ,挤压 “Bein” brand building drainage hard PVC pipe fire protection ring (hereinafter referred to as “fire protection ring”) was successfully developed by the Shanghai Fire Science Research Institute of the Ministry of Public Security and a new fire-retardant and fire-resistant product produced by Shanghai Beian Industrial Company. The product is made of metal material shell, filled with flame-retardant expansive core material, set on the UPVC pipe outer wall, fixed to the floor or wall parts. In the event of a fire, the core material rapidly expands due to heat, squeezing