BS 4790：1987
Determination of the effects of a small source of ignition on textile floor coverings
（hot metal nut method）
小火源对纺织物地板覆盖物作用效果（热金属核法）
Scope: It is applicable to all types of textile floor coverings whether loose-laid or fully adhered and used with or without an underlay
适用范围：适用于所有类型的纺织品地板覆盖物。
Method of mounting test specimens: loose-laid ,fully adhered, loose-laid with an underlay
样品安装方法：松铺型，完全粘附型，松铺带衬垫型
Test specimen: At least 3 test specimens each measuring 300mm*300mm
测试样品：至少3个试样300mm*300mm
Item Standard Requirement Flame BS5287
ⅰ）If the floor covering has a low radius(up to 35mm) of effects of ignition Pass
如果地板覆盖物表面燃烧半径少于
通过
ⅱ）If the floor covering has a medium radius(over 35 up to 75) of effects of ignition Pass
如果地板覆盖物表面燃烧半径大于35mm少于75mm
通过
ⅲ）If the floor covering has a high radius(over 75mm)of effects of ignition Failure
如果地板覆盖物表面燃烧半径大于75mm
失败
Conditioning: At least 24Hours in Humidity of 65+-2%and a temperature of 20degree .