1.1 本试验方法包括塑料和弹性体（根据术语定义 D883 )在特定的冲击条件下表现出脆性破坏。还提供了两个例行检查和验收程序。 注1: 当测试橡胶的冲击脆性时，使用试验方法 D2137 .当测试塑料片材的冲击脆性时，使用测试方法 D1790 . 1.2 以国际单位制表示的数值应视为标准。 1.3 由于与汞相关的潜在安全和环境危害- 填充温度计，鼓励使用替代温度测量设备（如热电偶和RTD）。 警告 汞已被许多监管机构指定为可能导致严重医疗问题的危险物质。汞或其蒸汽已被证明对健康有害，对材料具有腐蚀性。处理汞和含汞产品时应小心谨慎。有关更多信息，请参阅适用的产品安全数据表（SDS）。用户应意识到，法律可能禁止向您所在的州或国家销售汞和/或含汞产品。 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: 本试验方法和ISO 974涉及相同的主题，但技术内容不同。 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 该试验方法确定了50%的试样在此处规定的条件下可能失效的温度。该试验提供了对结晶等长期影响的评估，或由受试材料中增塑剂的低温不相容性引起的影响。塑料和弹性体用于许多需要在有或没有冲击的情况下进行低温弯曲的应用中。仅在变形条件与本试验方法中规定的条件相似的应用中，使用该方法获得的数据来预测塑料和弹性体材料在低温下的行为。 该测试方法已被发现可用于规范目的，但不一定测量材料适用的最低温度。 图1 试样夹具和撞击边缘之间的尺寸要求（A型） 图2 典型夹具（A型） 图3 B型撞击边缘和夹紧装置的尺寸细节（无缺口试样的定位） 注1: 尺寸单位为毫米。 图4 带试样的装配夹具，B型

1.1 This test method covers the determination of the temperature at which plastics and elastomers (as defined by Terminology D883 ) exhibit brittle failure under specified impact conditions. Two routine inspection and acceptance procedures are also provided. Note 1: When testing rubbers for impact brittleness use Test Method D2137 . When testing plastic sheeting for impact brittleness, use Test Method D1790 . 1.2 The values stated in SI units are to be regarded as the standard. 1.3 Due to the potential safety and environmental hazards associated with mercury-filled thermometers, the use of alternative temperature measuring devices (such as thermocouples and RTDs) is encouraged. Warning— Mercury has been designated by many regulatory agencies as a hazardous material that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and mercury containing products. See the applicable product Safety Data Sheet (SDS) for additional information. Users should be aware that selling mercury and/or mercury containing products into your state or country may be prohibited by law. 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 2: This test method and ISO 974 address the same subject matter, but differ in technical content. 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 This test method establishes the temperature at which 50 % of the specimens tested would probably fail when subjected to the conditions specified herein. The test provides for the evaluation of long-time effects such as crystallization, or those effects that are introduced by low-temperature incompatibility of plasticizers in the material under test. Plastics and elastomers are used in many applications requiring low-temperature flexing with or without impact. Use data obtained by this method to predict the behavior of plastic and elastomeric materials at low temperatures only in applications in which the conditions of deformation are similar to those specified in this test method. This test method has been found useful for specification purposes, but does not necessarily measure the lowest temperature at which the material is suitable for use. FIG. 1 Dimensional Requirements Between Specimen Clamp and Striking Edge (Type A) FIG. 2 Typical Clamp (Type A) FIG. 3 Dimensional Details of Striking Edge and Clamping Device, Type B (Positioning of Unnotched Test Specimen) Note 1: Dimensions are in millimetres. FIG. 4 Assembled Clamp with Test Specimens, Type B