1.1 本试验方法涵盖了当试样经受规定的受控试验条件时发生规定针头穿透的温度的测定。 1.2 对于乙基纤维素、非刚性聚氯乙烯、聚偏二氯乙烯或具有宽维卡软化范围的其他材料，不推荐使用此测试方法。 1.3 以SI单位表示的值将被视为标准值。本标准不包括其他单位。 1.4 由于与充汞温度计相关的潜在安全和环境危害，鼓励使用替代温度测量设备（如热电偶和RTD）。对于含汞的玻璃中液体温度计，鼓励使用替代测量设备，如使用热电偶或RTD传感器的数字温度计。1.5 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。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法规限制的适用性。 附注1: 该测试方法在技术上类似于ISO 306(2022)。 1.6 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》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 5.1 通过该测试方法获得的数据用于比较热塑性材料的热软化质量。 5.2 该测试方法在塑料材料的质量控制、开发和表征领域是有用的。

1.1 This test method covers determination of the temperature at which a specified needle penetration occurs when specimens are subjected to specified controlled test conditions. 1.2 This test method is not recommended for ethyl cellulose, nonrigid poly(vinyl chloride), poly(vinylidene chloride), or other materials having a wide Vicat softening range. 1.3 The values stated in SI units are to be regarded as standard. No other units are included in this standard. 1.4 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 with liquid-in-glass thermometers containing mercury, the use of alternative measuring devices, such as digital thermometers using thermocouple of RTD sensors is encouraged. 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 1: This test method is technically similar to ISO 306 (2022). 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 Data obtained by this test method is used to compare the heat-softening qualities of thermoplastic materials. 5.2 This test method is useful in the areas of quality control, development, and characterization of plastic materials.