1.1 本试验方法包括在规定的受控试验条件下测定试样发生规定针入度时的温度。 1.2 本试验方法不推荐用于乙基纤维素、非刚性聚氯乙烯、聚偏二氯乙烯或其他具有广泛维卡软化范围的材料。 1.3 以国际单位制表示的数值应视为标准值。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，鼓励使用液体替代温度测量装置（如热电偶和RTD）- 在含汞的玻璃温度计中，鼓励使用替代测量装置，例如使用RTD传感器热电偶的数字温度计。 1.5 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1: 本试验方法等同于ISO 306在所有部分中，除了蠕变裕量外，在试验开始之前，以及流化粉末作为传热介质的裕量。 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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 通过本试验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、开发和表征领域很有用。

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 equivalent to ISO 306 in all sections with the exceptions of the allowance for creep, prior to the beginning of the test and the allowance of the fluidized powder as a heat transfer medium. 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.