BS476-4: 建筑材料及结构的燃烧试验—第4部分:材料不燃性测试
BS476-4: Fire tests on building materials and structures- Part 4: Non-combustibility test for materials
BS476-4材料不燃性测试方法
将样品放入测试容器中,热电偶插入样品中心并且连接测试设备。此外样品的热电偶也放进炉子内部炉内温度达到750℃,这样的状态持续整个测试20分钟,记录下两个热电偶的相关数据。
BS476-4材料不燃性测试要求
BS476-4测试结果必须同时满足这两项要求:1.温升(炉内样品中心温度上升) 必须小于 50°C ;2.整个测试中的出现火焰燃烧的时间必须小于10秒.
BS476-4--Designation of non-combustibility
The material shall be deemed non-combustible if,during the test, none of the three specimens either:
1) causes the temperature reading from either of the two thermocouples to rise by 50 degC or more above the initial furnace temperature
2) is observed to flame continuously for 10 s or more inside the furnace. Otherwise, the material shall be deemed combustible.