1.1 本试验方法包括测定石油蜡的熔点（冷却曲线）。它不适用于矿脂基蜡、微晶蜡或此类蜡与石蜡或鳞片蜡的混合物。 注1: 有关测试石油蜡的其他方法，请参阅测试方法 D127 和试验方法 D938 . 根据使用的方法，结果可能会有所不同。药用矿脂的试验方法 D127 通常使用。 1.2 以国际单位制表示的数值应视为标准值。国际单位制后括号中给出的值仅供参考，不被视为标准值。 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。 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====== 5.1 熔点（冷却曲线）是蜡供应商和消费者广泛使用的测试方法。它特别适用于在性质上高度石蜡或结晶的石油蜡。当样品中含有相当数量的碳氢化合物，这些碳氢化合物在相同的温度下结晶，释放熔合热，从而暂时延缓冷却速度时，会出现平台。一般来说，含有大量非正常碳氢化合物或无定形固体形式的石油蜡不会出现平台。

1.1 This test method covers the determination of the melting point (cooling curve) of petroleum wax. It is unsuitable for waxes of the petrolatum group, microcrystalline waxes, or blends of such waxes with paraffin wax or scale wax. Note 1: For additional methods used for testing petroleum waxes, see Test Method D127 and Test Method D938 . Results may differ, depending on the method used. For pharmaceutical petrolatum, Test Method D127 usually is used. 1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 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. 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 ====== 5.1 Melting point (cooling curve) is a test that is widely used by wax suppliers and consumers. it is particularly applied to petroleum waxes that are rather highly paraffinic or crystalline in nature. A plateau occurs with specimens containing appreciable amounts of hydrocarbons that crystallize at the same temperature, giving up heat of fusion, thus temporarily retarding the cooling rate. In general, petroleum waxes with large amounts of non-normal hydrocarbons or with amorphous solid forms will not exhibit a plateau.