BS 476-7：建筑材料和构件的防火测试.第7部分:测定产品火焰表面蔓延分类的测试方法
BS 476-7：Fire Tests on Building Materials and Structures Part 7: Method of Test to Determine the Classification of the Surface Spread of Flame of Products
Abstract 摘要
This British Standard, a part of the BS 476 series, specifies a method of test for measuring the lateral spread of flame along the surface of a specimen of a product orientated in the vertical position under opposed flow conditions, and a classification system based on the rate and extent of the spread of flame.
This standard provides data suitable for comparing the end-use performances of essentially flat materials, composites or assemblies, which are used primarily as the exposed surfaces of walls or ceilings.
Guidance to operators carrying out this method of test, the effect of thermal characteristics on the performance of assemblies, advice on the construction and preparation of test specimens, and information on the validation of this method are provided in annexes to this standard.
