1.1 本试验方法包括通过毛细管法测定有机化学品样品的初始熔点和最终熔点，这些样品的熔点定义了熔融范围，这些样品在没有分解的情况下的熔点在30 °C和250 °C。 1.2 本试验方法仅适用于储存时足够稳定的结晶材料，以满足第节中规定的合格标准样品的要求 7. . 1.3 本试验方法不直接适用于不透明材料或非晶体材料，如蜡、脂肪和脂肪酸。 1.4 查阅当前的安全数据表（SDS），了解有关毒性、急救程序、处理和安全预防措施的详细信息。 1.5 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.6 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。 1.7 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 人们早就认识到，窄的熔点范围和高的最终熔点是结晶有机化合物高纯度的良好指示。几种ASTM测试方法使用这些标准来测定有机化合物的纯度( 注释1 ). 注1: 使用熔点（或冰点）数据来表明样品纯度的其他ASTM测试方法为测试方法 第852天 和 第6875天 . 5.2 该测试方法中规定的相对简单和快速的测试表明，被测样品的纯度高于或低于标准样品。出于规范目的，可以通过对标准样品和被测样品之间的最终熔点和熔点范围的差异设置限制来确保最低允许纯度。

1.1 This test method covers the determination, by a capillary tube method, of the initial melting point and the final melting point, which define the melting range, of samples of organic chemicals whose melting points without decomposition fall between 30 °C and 250 °C. 1.2 This test method is applicable only to crystalline materials that are sufficiently stable in storage to met the requirements of a satisfactory standard sample as defined in Section 7 . 1.3 This test method is not directly applicable to opaque materials or to noncrystalline materials such as waxes, fats, and fatty acids. 1.4 Review the current Safety Data Sheets (SDS) for detailed information concerning toxicity, first aid procedures, handling, and safety precautions. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 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. 1.7 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 It has long been recognized that narrow melting range and high final melting point are good indications of high purity in crystalline organic compounds. Several ASTM test methods use these criteria to assay the purity of organic compounds ( Note 1 ). Note 1: Other ASTM test methods using melting (or freezing point) data to indicate sample purity are Test Methods D852 and D6875 . 5.2 The relatively simple and rapid test prescribed in this test method shows the sample under test to be either more or less pure than the standard sample. For specification purposes, a minimum allowable purity can be assured by setting limits on the differences in final melting points and the melting ranges between the standard sample and the sample under test.