BS476-7:1997 Fire tests on building materials and structures-Part 7 method of test to determine the classification of the surface spread of flame of products.

BS476-7:1997 对建筑材料和结构的着火试验-第7部分：产品火焰表面延伸等级确定的测试方法。

BS476-7防火阻燃等级测试方法

测试方法是在燃烧箱内点燃烧样品，点燃源为燃气辐射板及中型燃气喷灯。辐射板的辐射强度在离75mm处为32.5kw/m2(表面)，喷灯的火焰高75-100mm，与辐射板在同一方向施加于试样。样品暴露在辐射热源板下10min。记录1.5分钟及10分钟样品的火焰传播程度。测试结果分成4个等级，Class 1、Class 2、Class 3、Class 4。Class 4级材料火灾危险性很高，不允许用为建材。

BS476-7 Class 1-Class 4阻燃等级

火焰蔓延等级（BS476-7阻燃等级）
等级	1.5 min火焰蔓延长度		10 min火焰蔓延长度
	限定长度 (mm)	单片测试样品限定长度 (mm)	限定长度 (mm)	单片测试样品限定长度 (mm)
BS476-7 Class 1	165	165+25	165	165+25
BS476-7 Class 2	215	215+25	455	455+45
BS476-7 Class 3	265	265+25	710	710+75
BS476-7 Class 4	超过BS476-7 class 3要求

BS476相关参考标准

BS 476: Fire tests on building materials and structures

BS 476: 建筑材料及构件防火测试

BS 476-3:2004 external fire exposure roof test

BS 476-3:2004 室外屋顶的燃烧测试

BS 476-4:1970 Non-combustibility test for materials

BS 476-4:1970 材料的不燃烧性测试

BS 476-5:1979 Method of test of ignitability

BS 476-5:1979 可燃性燃烧测试

BS476-6:1989+A1:2009 Method of test for propagation for materials

BS476-6:1989+A1:2009 制品火势蔓延的试验方法

BS 476-7:1997 Surface spread of flame test for material

BS 476-7:1997制品表面火势蔓延的试验和分级方法

BS 476-11:1982 Method for assessing the heat emission from building materials

BS 476-11:1982建筑材料热辐射性能测试方法

BS 476-12:1991 Ignitability of products by direct flame impingement

BS 476-12:1991产品直接火焰冲击的可燃性测试方法

BS 476-15:1992 Method for measuring heat release of products-cone calorimeter

BS 476-15:1992产品放热性测试-锥形量热仪

BS 476-20:1987 Method for determination of the fire resistance of elements of ctruction (general principles)

BS 476-20:1987建筑构件耐火的测定方法(一般原理)

BS 476-21:1987 Methods for determination of the fire resistance of loadbearing elements of ctruction

BS 476-21:1987 承重构件耐火的测定方法

BS 476-22:1987 Methods for determination of the fire resistance of non-loadbearing elements of ctruction

 

BS 476-22:1987非承重建筑构件耐火性能测试方法