1.1 该试验方法使用流变仪测定粘胶粘性材料是液体还是固体，以达到监管目的。极少量材料（通常少于3 g） 可以用于该测量。 1.2 以国际单位制表示的数值应视为标准。本标准中不包括其他计量单位。 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。 1.4 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 运输法规通常要求将材料识别为液体或固体。此测试方法可用于出于监管目的进行该确定。（另请参见测试方法 D4359 ） 5.2 对于液态热固性树脂，随着固化的进行，液态树脂变成固体。热固性树脂在液态时更容易加工或成形，并且随着固化的进行而变得更难加工或成形。类固体特性占主导地位的点被称为凝胶点，并被认为是热固性树脂可用的时期的结束。凝胶点被确定为测试方法中确定的tanδ=1的点 D4473 。 注1: 环境温度下的凝胶点很少是有用的参数。在更有用的高温下使用此测试方法需要随时可用但不在 7.2.6 ， 7.2.7 、和节 10 。 5.3 此测试方法可用于研究、开发和法规遵从性。

1.1 Using rheometry, this test method determines, for regulatory purposes, whether a viscose viscous material is a liquid or a solid. Very small amounts of material (typically less than 3 g) may be used for this measurement. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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 Shipping regulations often require the identification of a material as either a liquid or a solid. This test method may be used to make that determination for regulatory purposes. (See also Test Method D4359 .) 5.2 For liquid thermosetting resin, as cure progresses, the liquid resin becomes a solid. A thermosetting resin is more easily worked or shaped while in the liquid-like form and becomes more difficult to do so as the cure advances. The point at which the solid-like character becomes dominant is called the gel point and is considered to be the end of the period where the thermosetting resin is workable. Gel point is identified as that point where tan δ = 1 as determined in Test Method D4473 . Note 1: Gel point at ambient temperature is seldom a useful parameter. Use of this test method at the more useful elevated temperatures requires capabilities readily available but outside of 7.2.6 , 7.2.7 , and Section 10 . 5.3 This test method may be used in research, development, and for regulatory compliance.