ISO 20028-2:2017规定了试样的制备方法和用于确定热塑性聚酯成型和挤出材料性能的标准试验方法。给出了在测试前处理测试材料和调节成型前的测试材料和样品之间的要求。 给出了在指定状态下制备试样的程序和条件以及测量这些试样的材料性能的程序。列出了热塑性聚酯成型和挤出材料特性合适和必要的性能和试验方法。 性能从ISO 10350-1的一般测试方法中选出。本文件还包括对这些模制和挤出材料广泛使用或特别重要的其他测试方法，以及ISO 20028-1（粘度数量和拉伸弹性模量）中规定的指定性能。 为了获得可重现和可比较的测试结果，有必要使用样品制备和调理方法，样品尺寸和本文规定的测试程序。确定的值不一定相同使用不同尺寸的样品或使用不同程序制备的那些

ISO 20028-2:2017 specifies the methods of preparation of test specimens and the standard test methods to be used in determining the properties of thermoplastic polyester moulding and extrusion materials. Requirements for handling test material and for conditioning both the test material before moulding and the specimens before testing are given. Procedures and conditions for the preparation of test specimens in a specified state and procedures for measuring properties of the materials from which these specimens are made are given. Properties and test methods which are suitable and necessary to characterize thermoplastic polyester moulding and extrusion materials are listed. The properties have been selected from the general test methods in ISO 10350‑1. Other test methods in wide use for or of particular significance to these moulding and extrusion materials are also included in this document, as are the designatory properties specified in ISO 20028-1 (viscosity number and tensile modulus of elasticity). In order to obtain reproducible and comparable test results, it is necessary to use the methods of specimen preparation and conditioning, the specimen dimensions and the test procedures specified herein. Values determined will not necessarily be identical to those obtained using specimens of different dimensions or prepared using different procedures.