1.1 本试验方法包括在接近熔点时测定具有均匀塑性流动特性的某些碱溶性树脂的软化点。 1.2 树脂制造商应说明是否可将本试验方法用于其产品。 1.3 本试验方法不适用于苯乙烯-马来酸酐树脂。 注1: 有关松香和其他树脂的测试，请参阅测试方法 E28年 . 有关沥青、焦油和沥青的测试，请参阅测试方法 D2398 . 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====== 4.1 一般来说，对于此类材料，软化不会在特定温度下发生。随着温度的升高，这些材料逐渐地、不知不觉地从易碎的固体变为柔软、粘稠的液体。因此，如果结果具有可比性，则必须通过固定、任意和严格定义的方法来确定软化点。

1.1 This test method covers the determination of the softening point of certain alkali-soluble resins having uniform plastic flow characteristics as the melting point is approached. 1.2 The resin manufacturer should specify whether or not this test method may be used for his product(s). 1.3 This test method is not suitable for styrene-maleic anhydride resins. Note 1: For testing rosin and other resins, see Test Method E28 . For testing asphalts, tars, and pitches, see Test Method D2398 . 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 ====== 4.1 In general, with materials of this type, softening does not take place at a definite temperature. As the temperature rises, these materials gradually and imperceptibly change from brittle solids to soft, viscous liquids. For this reason, the determination of the softening point must be made by a fixed, arbitrary, and closely defined methods if the results are to be comparable.