BS EN ISO 4589-2:2017规定了在规定的试验条件下，测定与氮气混合的氧气最小体积分数的方法，该方法将支持小型垂直试样的燃烧。结果定义为氧指数（OI）值。提供了测试材料的方法，这些材料以垂直杆或厚度不超过10.5mm的薄板的形式自支撑。这些方法适用于表观密度大于等于100 kg/m3的固体、层压或多孔材料。这些方法也可能适用于表观密度小于100 kg/m3的一些多孔材料。本发明提供了一种在垂直支撑的情况下测试柔性片材或薄膜材料的方法。为了进行比较，提供了一种程序，用于确定材料的OI是否高于某个规定的最小值。交叉引用: ISO 7823-1:2003（R07）Ed 4ISO 2859-2ISO 5725-2ISO 291:2008 Ed 4ISO 4589-1:2017ISO 13943:2008 Ed 2ISO 2859-1:1999 ISO 2818:1994（R10）Ed 1ISO 295:2004 Ed 3ISO 3582:2000 Ed 2ISO 3167:2014 Ed 5ISO 293:2004 Ed 3ASTM D2863-95ISO 5725:1986ISO 294:1995购买本文件时提供的所有现行修订版均包括在内。

BS EN ISO 4589-2:2017 specifies methods for determining the minimum volume fraction of oxygen, in admixture with nitrogen, that will support combustion of small vertical test specimens under specified test conditions. The results are defined as oxygen index (OI) values.Methods are provided for testing materials that are self-supporting in the form of vertical bars or sheets up to 10,5 mm thick. These methods are suitable for solid, laminated or cellular materials characterized by an apparent density 100 kg/m3 or greater. The methods might also be applicable to some cellular materials having an apparent density of less than 100 kg/m3. A method is provided for testing flexible sheets or film materials while supported vertically.For comparative purposes, a procedure is provided for determining whether or not the OI of a material lies above some specified minimum value.Cross References:ISO 7823-1:2003 (R07) Ed 4ISO 2859-2ISO 5725-2ISO 291:2008 Ed 4ISO 4589-1:2017ISO 13943:2008 Ed 2ISO 2859-1:1999 ISO 2818:1994 (R10) Ed 1ISO 295:2004 Ed 3ISO 3582:2000 Ed 2ISO 3167:2014 ED5ISO 293:2004 Ed 3ASTM D2863 - 95ISO 5725:1986ISO 294:1995All current amendments available at time of purchase are included with the purchase of this document.