本文件规定了在60°C至220°C的温度下，使用有机洗脱液，通过尺寸排除色谱法（SEC）测定聚合物平均分子量和分子量分布的方法（见附录a）。根据使用聚合物标准制备的校准曲线计算平均分子量和分子量分布。因此，本试验方法被归类为相对方法（见ISO 16014-1）。

This document specifies a method for determining the average molecular weight and the molecular weight distribution of polymers by size-exclusion chromatography (SEC) using an organic eluent at temperatures between 60 °C and 220 °C (see Annex A). The average molecular weight and the molecular weight distribution are calculated from a calibration curve prepared using polymer standards. Therefore, this test method is classified as a relative method (see ISO 16014-1).