1.1 该试验方法涵盖了当试样经受任意一组试验条件时，发生任意变形的温度的确定。 1.2 本试验方法适用于厚度为3 毫米( 1. / 8. 英寸）或更大，并且在常温下是刚性的或半刚性的。 注1: 小于3的板材 毫米（0.125 英寸）但大于1 毫米（0.040 英寸）的厚度可以通过使用最小厚度为3 层压板必须具有均匀的应力分布。一种类型的复合材料试样是通过将层压板的端部粘合在一起，然后用砂纸打磨边缘来制备的。荷载方向应垂直于单个叠片的边缘。 1.3 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.4 本标准和ASTM D648 涉及相同的主题，本质上是相同的测试。然而，由于传热介质的差异导致的已知结果差异，本标准和ASTM的结果 D648 不得进行比较或视为等效。 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 注2: 本标准的文本引用了提供解释性材料的注释和脚注。 这些注释和脚注（不包括表和图中的注释和脚注）不应被视为本标准的要求。 注3: 本标准与ISO 75-1和ISO 75-2涉及相同的主题，但技术内容不同，两种测试方法的结果不应进行比较。 1.6 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 此测试特别适用于控制和开发工作。通过本试验方法获得的数据不得用于预测塑料材料在高温下的行为，除非在时间、温度、加载方法和纤维应力等因素与本试验方法中规定的因素相似的应用中。 这些数据不用于设计或预测高温下的耐久性。 5.2 对于许多材料，可能会有一个规范要求使用这种测试方法，但在遵守规范时，会有一些优先的程序修改。因此，在使用本试验方法之前，建议参考该材料规范。参见分类中的表1 D4000 ，列出了目前存在的ASTM材料标准。

1.1 This test method covers the determination of the temperature at which an arbitrary deformation occurs when specimens are subjected to an arbitrary set of testing conditions. 1.2 This test method applies to molded and sheet materials available in thicknesses of 3 mm ( 1 / 8 in.) or greater and which are rigid or semirigid at normal temperature. Note 1: Sheet stock less than 3 mm (0.125 in.) but more than 1 mm (0.040 in.) in thickness may be tested by use of a composite sample having a minimum thickness of 3 mm. The laminae must be of uniform stress distribution. One type of composite specimen has been prepared by cementing the ends of the laminae together and then smoothing the edges with sandpaper. The direction of loading shall be perpendicular to the edges of the individual laminae. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.4 This standard and ASTM D648 address the same subject matter and are essentially the same test. However, due to known differences in results caused by the differences in heat transfer media, the results from this standard and ASTM D648 must not be compared or considered equivalent. 1.5 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 2: The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. Note 3: This standard and ISO 75-1 and ISO 75-2 address the same subject matter, but differ in technical content, and results shall not be compared between the two test methods. 1.6 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 This test is particularly suited to control and development work. Data obtained by this test method shall not be used to predict the behavior of plastic materials at elevated temperatures except in applications in which the factors of time, temperature, method of loading, and fiber stress are similar to those specified in this test method. The data are not intended for use in design or predicting endurance at elevated temperatures. 5.2 For many materials, it is possible there will be a specification that requires the use of this test method, but with some procedural modifications that take precedence when adhering to the specification. Therefore, it is advisable to refer to that material specification before using this test method. Refer to Table 1 in Classification D4000 , which lists the ASTM material standards that currently exist.