ISO 4629-1:2016规定了一种滴定法，用于测定涂料和清漆用粘合剂和粘合剂溶液中的游离羟基。羟基可以以多元醇、部分酯、聚酯端基或羟基化脂肪酸的形式存在。 该方法不适用于同时含有羟基和环氧基的树脂，因为后者也将包含在结果中。该方法也不适用于硝酸纤维素或酚醛树脂。 注1:对于粘合剂溶液，如果仅测定粘合剂的羟基值，则必须考虑粘合剂溶液的其他成分可能含有羟基的可能性。 注2:ISO 7142[1]规定了测定环氧树脂羟基值的方法。

ISO 4629-1:2016 specifies a titrimetric method for determining the free hydroxyl groups in binders and binder solutions for paints and varnishes. The hydroxyl groups may be present as polyhydric alcohols, partial esters, polyester end groups or hydroxylated fatty acids. This method is not applicable to resins containing both hydroxyl groups and epoxy groups, because the latter will also be included in the result. Also the method is not applicable to cellulose nitrate or to phenolic resins. NOTE 1 If, in the case of binder solutions, the hydroxyl value of the binder only is to be determined, the possibility that other constituents of the binder solution may contain hydroxyl groups has to be taken into account. NOTE 2 A method for the determination of the hydroxyl value of epoxy resins is specified in ISO 7142[1].