BS 7034-1-1988 Glass viscosity and determination of viscosity fixed points - Part 1: Recommended standards for the determination of viscosity and determination of viscosity fixed points "is a basic standard for the measurement of glass viscosity developed by the British Standards Institution. The standard provides guidelines for the determination of glass viscosity and related fixed points, including definitions, terminology, selection of Measuring methods, and determination of viscosity fixed points. It is applicable to the fields of glass production, research and development, and quality control. It provides a theoretical framework and general requirements for subsequent specific Measuring methods (such as swirl/spin Viscosity meter method, fiber drawing method, etc.). This standard lays the foundation for ensuring the accuracy and conformity of Glass viscosity measurement and is an important technical reference for the Glass industry.