1.1 本规程涵盖了制备试样用热塑性颗粒和研磨料的压缩成型。 2. 1.2 虽然给出了某些材料的条件，但具体条件的主要来源应是每种材料的材料规范标准。 1.3 单位- 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 注1: 本规程的主体等同于ISO 293-1986. 附件A1 和ISO 293-1986在某些细节上有所不同；然而，使用 附件A1 ，程序A应等同于使用ISO制备的程序 293-1986，冷却方法D。使用 附件A1 ，程序C应等同于使用ISO制备的程序 293-1986，冷却方法B。然而，由于ISO标准的冷却速率公差较大，根据ISO冷却方法B制备的试样可能不等同于 附件A1 ，程序C。 ====意义和用途====== 4.1 制备和模制样品材料的方法会影响样品的机械性能。与注射成型不同，压缩成型的目标是生产均质和各向同性的试样或板材。样品可以由直接从材料制造商处获得的粉末或颗粒、在循环回收操作中产生的颗粒、或由在两个平面上制备的铣削预制件或板材制成- 辊磨机。粉末、颗粒、颗粒、预制件或板材在设计用于生产给定几何形状、尺寸和厚度的成品试样的模具中熔化和模制，或以光滑斑块或均匀厚度板材的形式熔化和模制，从中切割、冲压或机加工所需试样。成型前在双辊轧机上加工化合物将以影响化合物物理性能的方式分散和分布化合物添加剂。应咨询相关材料规范或材料制造商，以确定是否需要在压缩成型之前研磨样品。以相同的方式处理同一类型材料的不同样品很重要:如果在将用作比较标准的材料上成型之前进行铣削，则应以类似的方式制备和成型所有根据本惯例进行测试的新材料。 4.2 制备足够试样所需的仪器和准确条件通常因每种塑料材料而异。本规程第节给出了许多不同塑料材料的成型设备和程序 5和 6. . 附录中给出了令人满意的用于成型某些特定材料的装置和程序。在任何情况下，应参考相关材料规范或通过买方和供应商之间的协议，获得用于生产给定材料的压模试样的特定装置和程序。

1.1 This practice covers the compression molding of thermoplastic granules and milled stock for the preparation of test specimens. 2 1.2 While conditions for certain materials are given, the primary source of specific conditions shall be the material specification standards for each type of material. 1.3 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Note 1: The main body of this practice is equivalent to ISO 293-1986. Annex A1 and ISO 293-1986 differ in some details; however, specimens prepared using Annex A1 , Procedure A should be equivalent to those prepared using ISO 293-1986, Cooling Method D. Specimens prepared using Annex A1 , Procedure C should be equivalent to those prepared using ISO 293-1986, Cooling Method B. However, due to the greater cooling rate tolerances of the ISO standard, specimens prepared in accordance with ISO Cooling Method B may not be equivalent to Annex A1 , Procedure C. ====== Significance And Use ====== 4.1 The methods by which sample materials are prepared and molded influence the mechanical properties of the specimen. Unlike injection molding, the objective of compression molding is to produce test specimens or sheets that are both homogeneous and isotropic. Specimens can be molded from powder or pellets such as are received directly from a material manufacturer, particles produced in a recycle recovery operation, or from a milled preform or sheet prepared on a two-roll mill. The powder, pellets, particles, preform, or sheet are melted and molded in a mold designed to produce a finished specimen of a given geometry, size, and thickness, or melted and molded in the form of a smooth plaque or sheet of uniform thickness from which desired specimens are cut, punched, or machined. Working a compound on a two-roll mill prior to molding will disperse and distribute the compound additives in a manner that will affect the physical properties of the compound. The relevant material specification or the material manufacturer shall be consulted to determine the need for milling a sample prior to compression molding. It is important to treat different samples of the same type of material in the same way: if milling was done prior to molding on a material which is to be used as a standard for comparison, all new materials to be tested against this practice shall be prepared and molded in a similar manner. 4.2 The apparatus and exact conditions required to prepare adequate specimens will usually vary for each plastic material. Apparatus and procedures satisfactory for molding many different plastic materials are given in this practice in Sections 5 and 6 . The apparatus and procedures which have been found satisfactory for molding certain specific materials are given in the Appendixes. In any case, the specific apparatus and procedures to be used in producing compression-molded specimens of a given material shall be obtained by reference to the relevant material specification or by agreement between the purchaser and the supplier.