BS 7034-3-1988 Glass viscosity and determination of viscosity fixed points - Part 3: Determination of viscosity by fibre tensile Viscosity meter is a standard developed by the British Standards Institution, which specifies a method for measuring the viscosity of Glass by fibre tensile Viscosity meter. This method determines the dynamic viscosity of Glass by measuring the elongation of fiberglass under uniaxial stress, and can also evaluate the relationship between viscosity and temperature and the effect of thermal history on viscosity. This standard is suitable for high temperature viscosity measurement of Glass materials and provides a scientific basis for Glass production, research and development and quality control.