本方法适用于酯含量在0.005%（m/m）至0.15%（m/m）范围内的产品。其原理是用过量的标准体积氢氧化钠溶液煮沸，使试验部分中的酯皂化；在酚酞作为指示剂的情况下，用标准体积盐酸溶液滴定，测定残余氢氧化钠，从而测定皂化所用的量。-国际标准ISO 1388/1至ISO 1377/12取消并取代了ISO建议R 1388-1970，这些标准构成了技术修订版。

The method is applicable to products having esters contents in the range 0.005 % (m/m) to 0.15 % (m/m). The principle consists in the saponification of esters present in a test portion by boiling with excess standard volumetric sodium hydroxide solution; determination of the residual sodium hydroxide, and hence the amount used for saponification, by titration with standard volumetric hydrochloric acid solution in the presence of phenolphthalein as indicator. - International Standards ISO 1388/1 to ISO 1377/12 cancel and replace ISO Recommendation R 1388-1970 of which they constitute a technical revision.