ISO 26603:2017规定了用于制备聚氨酯的芳香族异氰酸酯总氯含量的测定。总氯含量和可水解氯含量之间的差异（见ISO 15028）是对产品中残留的工艺溶剂的测量。这两种试验方法都适用于多种有机化合物，包括脂肪族异氰酸酯，但可能需要调整所用的样品量。这些测试方法可用于研究或质量控制。 注:本文件在技术上等同于ASTM D4661？3

ISO 26603:2017 specifies the determination of the total chlorine content of aromatic isocyanates used in the preparation of polyurethanes. The difference between the total chlorine content and the hydrolyzable chlorine content (see ISO 15028) is a measure of the process solvents left in the product. Both test methods are applicable to a variety of organic compounds, including aliphatic isocyanates, but the amount of sample used might need to be adjusted. These test methods can be used for research or for quality control. NOTE This document is technically equivalent to ASTM D4661?03.