1.1 本试验方法包括通过测定玻璃圆形纤维的温度来测定玻璃的软化点，该玻璃圆形纤维标称直径为0.65 mm，长度为235 mm，具有规定的公差，当其长度的上部100 mm在规定的炉中以5°C/min±1°C/min的速度加热时，在其自身重量下以1 mm/min的速度伸长。 2. 1.2 以国际单位制表示的值应被视为标准值。括号中给出的值仅供参考。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。 本标准的使用者有责任在使用前建立适当的安全、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====== 2.1 该测试方法可用于大致确定玻璃在玻璃中表现为刚性固体的温度- 形成操作和用于指示成分变化的控制测试。它已被发现对规范验收和为玻璃研发工作提供信息非常有用。 2.2 软化点对应的粘度约为10 6.5 – 10 7 Pa∙s。软化点的确切粘度取决于玻璃的密度。有时，粘度为10 6.6 使用钠钙硅玻璃的Pa∙s。 3.

1.1 This test method covers the determination of the softening point of a glass by determining the temperature at which a round fiber of the glass, nominally 0.65 mm in diameter and 235 mm long with specified tolerances, elongates under its own weight at a rate of 1 mm/min when the upper 100 mm of its length is heated in a specified furnace at the rate of 5 °C/min ± 1 °C/min. 2 1.2 The values stated in SI units are to be regarded as standard. The values given in parenthesis are for information only. 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 ====== 2.1 This test method is useful to determine approximately the temperature below which the glass behaves as a rigid solid in glass-forming operations and for a control test to indicate changes in composition. It has been found useful for specification acceptance and for providing information in research and development work with glass. 2.2 The softening point corresponds to a viscosity ~10 6.5 – 10 7.0 Pa∙s. The exact viscosity at the softening point depends on the density of the glass. Sometimes, a viscosity of 10 6.6 Pa∙s for soda-lime silica glasses is used. 3