BS476-7:1997 Fire tests on building materials and structures-Part 7method of test to determine the classification of the surfacespread 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，Class1、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) | ||
BS476-7 Class 1 | 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 formaterials
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 frombuilding 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 flameimpingement
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-conecalorimeter
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 ofelements 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 resistanceof 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 resistanceof non-loadbearing elements of ctruction
BS 476-22:1987非承重建筑构件耐火性能测试方法
