1.1 本试验方法包括通过差示扫描量热法（DSC）测定石油蜡（包括微晶蜡）的转变温度。这些转变可能以固-固转变或固液转变的形式发生。 1.2 正常工作温度范围为15 °C至150 °C( 注1 ). 1.3 以国际单位制表示的数值应视为标准。 1.4 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。 1.5 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 DSC是一种方便快速的方法，用于确定蜡在转变过程中所经历的温度极限。最高温度转变是与完全熔融相关的固液转变；它可以指导蜡的储存和应用温度的选择。固-固温度转变与固体的性质有关，即硬度和堵塞温度。 注2: 对于切割相对较窄的石油蜡，最低的转变将是固体-固体转变。窄切蜡是通过对单个石油馏出物进行脱油获得的蜡，最大范围为120 在其5°F之间 % 和95 % vol符合试验方法 D1160 沸点（换算为760 托尔）。差示扫描量热法无法区分固-液和固-固转变。此类信息必须通过其他技术预先确定。对于共混物，低温转变可能是固液和固-固转变的包络线。 5.2 由于石油蜡是具有不同分子量的碳氢化合物的混合物，其转变在一定温度范围内发生。该范围是影响DSC峰值宽度（以°C表示）的一个因素。最高温度转变为一级转变。如果，对于一系列蜡，有证据表明每种蜡的最高温度转变是主要的第一温度- 有序转变，其相对宽度应和蜡分子量分布的相对宽度相关。

1.1 This test method covers the transition temperatures of petroleum waxes, including microcrystalline waxes, by differential scanning calorimetry (DSC). These transitions may occur as a solid-solid transition or as a solid-liquid transition. 1.2 The normal operating temperature range extends from 15 °C to 150 °C ( Note 1 ). 1.3 The values stated in SI units are to be regarded as the standard. 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. 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 DSC in a convenient and rapid method for determining the temperature limits within which a wax undergoes during transitions. The highest temperature transition is a solid-liquid transition associated with complete melting; it can guide the choice of wax storage and application temperatures. The solid-solid temperature transition is related to the properties of the solid, that is, hardness and blocking temperature. Note 2: For a relatively narrow cut petroleum wax, the lowest transition will be a solid-solid transition. A narrow cut wax is one obtained by deoiling a single petroleum distillate with a maximum range of 120 °F between its 5 % and 95 % vol in accordance with Test Method D1160 boiling points (converted to 760 torr). The DSC method cannot differentiate between solid-liquid and solid-solid transitions. Such information must be predetermined by other techniques. In the case of blends, the lower temperature transition may be envelopes of both solid-liquid and solid-solid transitions. 5.2 Since petroleum wax is a mixture of hydrocarbons with different molecular weights, its transitions occur over a temperature range. This range is one factor that influences the width, expressed in °C, of the DSC peaks. The highest temperature transition is a first-order transition. If, for a series of waxes, there is supporting evidence that the highest temperature transition of each wax is the major first-order transition, its relative width should correlate with the relative width of the wax's molecular weight distribution.