1.1 本试验方法包括测定约10%的玻璃粘度 8. Pa·s至约10 13 通过测量简单加载的玻璃梁的粘性弯曲速率来测量Pa·s。 2. 由于玻璃的热历史，粘度可能不代表测量粘度范围高端的热平衡条件。在任何温度或热预处理下长时间进行的测量将使玻璃接近平衡结构条件，从而将这些影响降至最低。相反，该方法也可用于关注非平衡条件的实验程序。 1.2 以国际单位制表示的数值应视为标准值。本标准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====== 4.1 本试验方法非常适合在高于平行板覆盖范围的范围内测量玻璃的粘度（见试验方法 C1351M )和旋转粘度计（见实践 C965 )方法。该测试方法有助于在玻璃成为商业对象后以及在研究和开发中提供与玻璃行为相关的信息。

1.1 This test method covers the determination of glass viscosity from approximately 10 8 Pa·s to approximately 10 13 Pa·s by measuring the rate of viscous bending of a simply loaded glass beam. 2 Due to the thermal history of the glass, the viscosity may not represent conditions of thermal equilibrium at the high end of the measured viscosity range. Measurements carried out over extended periods of time at any temperature or thermal preconditioning will minimize these effects by allowing the glass to approach equilibrium structural conditions. Conversely, the method also may be used in experimental programs that focus on nonequilibrium conditions. 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 ====== 4.1 This test method is well suited for measuring the viscosity of glasses in ranges higher than those covered by parallel plate (see Test Method C1351M ) and rotational viscometry (see Practice C965 ) methods. This test method is useful for providing information related to the behavior of glass after it has been formed into an object of commerce and in research and development.