1.1 本试验方法包括测定1.00 mm（0.040 in.）塑料薄膜的温度在规定的冲击条件下，厚度小于等于1.5 mm的材料表现出脆性破坏。 1.2 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。 注1: 本试验方法是与塑料工业协会联合开发的，主要用于增塑乙烯基片材。用户必须验证其对其他塑料板的适用性。 1.3 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、健康和环境实践，并确定监管限制的适用性。 注2: 本试验方法和ISO 8570涉及相同的主题，但技术内容不同。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 仅当变形条件与本试验方法中规定的条件相似时，通过本试验方法获得的数据才用于预测塑料薄膜在低温下的行为。本试验方法适用于规范试验和比较目的，但不一定确定特定塑料的最低使用温度。 4.2 已经证明，在压延板材上，脆性温度对折叠方向敏感。研究还表明，脆性温度对取样方向很敏感。因此，必须明确遵守取样和折叠程序。

1.1 This test method covers the determination of that temperature at which plastic sheeting 1.00 mm (0.040 in.) or less in thickness exhibits a brittle failure under specified impact conditions. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. Note 1: This test method was developed jointly with the Society of the Plastics Industry, primarily for use with plasticized vinyl sheetings. Its applicability to other plastic sheetings must be verified by the user. 1.3 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: This test method and ISO 8570 address the same subject matter, but differ in technical content. 1.4 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 ====== 4.1 Data obtained by this test method have been used to predict the behavior of plastic sheeting at low temperatures only if the conditions of deformation are similar to those specified in this test method. This test method is useful for specification testing and for comparative purposes, but does not necessarily determine the lowest use temperature for a particular plastic. 4.2 It has been demonstrated that on calendared sheeting the brittleness temperature is sensitive to the direction of fold. It has also been demonstrated that the brittleness temperature is sensitive to the direction of sampling. Therefore, it is imperative that the procedure for taking specimens and folding be followed explicitly.