塑料.聚甲醛模塑和挤塑材料.第2部分:试样制备和性能测定

[中文适用范围]： 本文件规定了测试样品的制备方法以及用于确定聚甲醛（POM）模塑和挤出材料性能的测试方法。 规定了处理测试材料以及成型前测试材料和测试前样品的调节要求。 给出了制备测试样品的程序和条件以及测量制作这些样品的材料性能的程序。 列出了表征 POM 模塑和挤出材料的合适且必要的性能和测试方法。 这些特性是从通用测试方法中选择的。 本文件还包括广泛使用或对这些模塑和挤出材料特别重要的其他测试方法，以及指定性能：熔体流动速率和拉伸模量。 为了获得可重复和可比较的测试结果，打算使用本文件中规定的制备和调节方法、样本尺寸和测试程序。 测定的值不一定与使用不同尺寸的样本获得的值或使用不同程序制备的值相同。 [外文原描述]： ISO 29988-2:2018 specifies the methods of preparation of test specimens and the test methods to be used in determining the properties of polyoxymethlene (POM) moulding and extrusion materials. Requirements for handling test materials and for conditioning both the test materials before moulding and the specimens before testing are specified. Procedures and conditions for the preparation of test specimens 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 POM moulding and extrusion materials are listed. The properties have been selected from the general test methods. 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: melt flow rate and tensile modulus. In order to obtain reproducible and comparable test results, it is intended to use the methods of preparation and conditioning, the specimen dimensions and the test procedures specified in this document. Values determined will not necessarily be identical to those obtained using specimens of different dimensions or prepared using different procedures.