1.1 本规程涵盖了热塑性模塑和挤出材料注塑试样时应遵循的一般原则。这种做法用于获得描述注塑成型过程各个步骤的方法的一致性，并建立报告这些条件的统一方法。制备合适试样所需的确切条件因每种塑料材料而异。材料规范中与本标准不同的任何要求或建议优先于本标准中的要求或建议。始终参考参考材料文件进行试样制备。如果没有参考文件，请咨询材料供应商以获取试样制备指导，并在测试报告中注明。 1.2 所提出的方法假设使用往复式螺杆注塑机。 1.3 以国际单位制表示的值应被视为标准。括号中给出的值仅供参考。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 注1: 本规程等同于ISO 294的以下部分:塑料——热塑性材料试样的注塑成型；294-1:第1部分——一般原理和多用途试样（ISO A型模具）和棒材（ISO B型模具）；ISO 294-2:第2部分——小抗拉钢筋（ISO C型模具）；ISO 294-3:第3部分——板材（ISO D型模具）。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 =====意义和用途====== 5.1 众所周知，在不同条件下模制的塑料试样可能具有明显不同的性能。这种做法旨在通过建立操作协议来尽量减少这些差异，而不会受到不必要的限制。 5.2 有关推荐的成型条件，请始终参考ASTM材料规范或ISO名称。如果没有，请咨询材料供应商。 5.3 这种做法需要使用足够数量的塑料材料来找到理想的操作条件并制作所需的试样。

1.1 This practice covers the general principles to be followed when injection molding test specimens of thermoplastic molding and extrusion materials. This practice is used to obtain uniformity in methods of describing the various steps of the injection molding process and to set up uniform methods of reporting these conditions. The exact conditions required to prepare suitable specimens will vary for each plastic material. Any requirements or recommendations in the material specification that differ from this standard take precedence over those in this standard. Always consult the referenced material document for specimen preparation. If no referenced document exists, then consult the material supplier for specimen preparation guidance and note such in the test report. 1.2 The methodology presented assumes the use of reciprocating screw injection molding machines. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Note 1: This practice is equivalent to the following parts of ISO 294: Plastics—Injection Moulding of Test Specimens of Thermoplastic Materials; 294-1: Part 1—General Principles and Multipurpose Test Specimens (ISO Type A Mould) and Bars (ISO Type B Mould); ISO 294-2: Part 2—Small Tensile Bars (ISO Type C Mould); ISO 294-3: Part 3—Plates (ISO Type D Moulds). 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 It is well known that plastic test specimens molded under different conditions can have significantly different properties. This practice is designed to minimize those differences by establishing operating protocols without being unnecessarily restrictive. 5.2 Always refer to the ASTM material specification or ISO designation for the material for recommended molding conditions. If not available, consult the material supplier. 5.3 This practice requires the use of adequate quantities of plastic material to find desirable operating conditions and to make the desired test specimens.