ISO 663:2017规定了确定动植物脂肪和油的不溶性杂质含量的方法。 如果不希望在不溶性杂质含量中包括皂（特别是钙皂）或氧化脂肪酸，则需要使用不同的溶剂和方法。在这种情况下，有关各方应达成协议。 牛奶和奶制品（或来自牛奶和奶制品的脂肪）不在本文档的范围之内

ISO 663:2017 specifies a method for the determination of the insoluble impurities content of animal and vegetable fats and oils. If it is not desired to include soaps (particularly calcium soaps) or oxidized fatty acids in the insoluble impurities content, it is necessary to use a different solvent and procedure. In this case, an agreement is to be reached between the parties concerned. Milk and milk products (or fat coming from milk and milk products) are excluded from the scope of this document.