ISO 6235:2016规定了未经压缩的生料丁苯橡胶（SBR）和未经压缩的生料丁苯橡胶共混物中长聚苯乙烯嵌段含量的测定方法。 不适用于嵌段丁苯橡胶与EPDM、IIR、CSM和其他卤化橡胶的共混物。 该方法适用于上述组合物的未经加工的胶乳，并且适用于嵌段聚苯乙烯含量在5%（重量）到100%（重量）范围内的橡胶。 嵌段聚苯乙烯含量小于5%（按重量计）的橡胶可能会产生不正确的结果，除非应用基于使用此类橡胶获得的信息的修正系数。 该方法适用于无凝胶橡胶，但如果已证明凝胶不会干扰，则可用于含有凝胶的橡胶。

ISO 6235:2016 specifies a method for the determination of the long polystyrene block content of raw uncompounded styrene-butadiene rubber (SBR) and raw uncompounded blends of block SBR. It is not applicable to blends of block SBR with EPDM, IIR, CSM and other halogenated rubbers. The method is applicable to raw, uncompounded latices of the above compositions and is suitable for rubbers having block polystyrene contents in the range from 5 % (by weight) to 100 % (by weight). Rubbers having block polystyrene contents of less than 5 % (by weight) may yield incorrect results unless a correction factor, based on information gained by working with such rubbers, is applied. The method is intended for use on gel-free rubbers, but it may be used on rubbers containing gel if it has been proved that the gel does not interfere.