The calculated fire-safety indexes for PE, fire-retardant PE, and PBT were 63. 24, 58. 00 and 90. 91, respectively.

• 计算得到聚乙烯的火灾危险指数为63．24,添加膨胀型阻燃剂聚乙烯火灾危险指数为58．00,PBT火灾危险指数为90．91。