1.1 这些实践包括确定液相线温度的程序( 注1 )玻璃的( 注1 )通过确定第一晶体化合物的边界温度，当玻璃试样在其整个长度上保持在规定的温度梯度下一段时间，以获得晶体和玻璃相之间的热平衡。 注1: 这些术语在术语中定义 C162 . 1.2 包括两种方法，在样品类型、仪器、样品定位程序和炉内温度梯度测量方面有所不同。 两种方法的精度相当。方法B是非常流体玻璃的首选方法，因为它最大限度地减少了热和机械混合效应。 1.2.1 方法A 采用槽式铂容器（托盘），其中精细筛选的玻璃颗粒融合成由槽定义的薄板条配置。 1.2.2 方法B 采用穿孔铂托盘，其中较大的筛分颗粒位于板上的每个孔上，因此彼此独立熔化。 2. 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====== 3.1 这些做法有助于确定玻璃中形成结晶的最高温度，以及玻璃可以在不形成和生长晶体的情况下长时间保持的最低温度。

1.1 These practices cover procedures for determining the liquidus temperature ( Note 1 ) of a glass ( Note 1 ) by establishing the boundary temperature for the first crystalline compound, when the glass specimen is held at a specified temperature gradient over its entire length for a period of time necessary to obtain thermal equilibrium between the crystalline and glassy phases. Note 1: These terms are defined in Terminology C162 . 1.2 Two methods are included, differing in the type of sample, apparatus, procedure for positioning the sample, and measurement of temperature gradient in the furnace. Both methods have comparable precision. Method B is preferred for very fluid glasses because it minimizes thermal and mechanical mixing effects. 1.2.1 Method A employs a trough-type platinum container (tray) in which finely screened glass particles are fused into a thin lath configuration defined by the trough. 1.2.2 Method B employs a perforated platinum tray on which larger screened particles are positioned one per hole on the plate and are therefore melted separately from each other. 2 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 ====== 3.1 These practices are useful for determining the maximum temperature at which crystallization will form in a glass, and a minimum temperature at which a glass can be held, for extended periods of time, without crystal formation and growth.