6.4.1 Fabric shall be tested in accordance with test 3 of BS5438. Three specimens shall be tested in the machine direction and three in the cross direction using a 10 s flame application time .
Taking the two vertical trip threads as representing one trip thread ,in each of at least four specimins not more than one trip thread (i.e.300 mm or either or both of the vertical trip threads )shall be severed.In either of the two remaining specimens not more than two trip threads (I.e.300 mm and 600 mm ,or 300 mm and either or both of the vertical trip threads ) shall be severed. If all three trip threads (i.e.300 mm ,600 mm and eit her of the vertical trip threads )are severed on any specimen the fabric shall be deemed not to comply with the requirements of this standard.
6．4 Flammability requirements ,class F 防火要求 等级 f 6.4.1 Fabric shall be tested in accordance with test 3 of BS5438. Three specimens shall be tested in the machine direction and three in the cross direction using a 10 s flame application time . 依据BS5438测试3测试织物。用10秒燃烧测试时间测试，纵横方向各测试3个样本。 Taking the two vertical trip threads as representing one trip thread ,in each of at least four specimins not more than one trip thread (i.e.300 mm or either or both of the vertical trip threads )shall be severed. In either of the two remaining specimens not more than two trip threads (I.e.300 mm and 600 mm ,or 300 mm and either or both of the vertical trip threads ) shall be severed. If all three trip threads (i.e.300 mm ,600 mm and eit her of the vertical trip threads )are severed on any specimen the fabric shall be deemed not to comply with the requirements of this standard 取两根垂直方向标志线合在一起算做一根标志线，其中最少要使用4个不多于一根标志线的样本（如300毫米或其一或者两个垂直标志线）。应使用两个剩余样本中任一个不多于两根标志线的样本（如300毫米和600毫米，或300毫米和/或者两个垂直标志线）。如果任何一个样板都使用所有三根标志线（如300m, 600mm和垂直标志线的任一个），织物将被认定为不符合此标准。
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