![]() ![]() Note! Viscosity conversions are based on fluids with specific gravity of one. Check ASTM D 2161 "Standard Practice for Conversion of Kinematic Viscosity to Saybolt Universal Viscosity or to Saybolt Furol Viscosity"Ģ) Water at 68.4 oF (20.2 oC) has an absolute viscosity of one - 1 - centiPoise. For industrial glasses the developed models are superior to previous work by maintaining or improving the prediction accuracy, and/or by extending the composition area covered, and through an advanced data analysis technique.1) The Saybolt Universal SUS viscosity equivalent (SSU or SUS) to a given kinematic viscosity varies with the temperature at which the determination is made. 6 with an error of 9☌, and at log(viscosity/Pa*s) = 1. 0 with an error of 7☌, at log(viscosity/Pa*s) = 6. ![]() The analysis so far makes it possible to estimate the viscosity isokoms at log(viscosity/Pa*s) = 12. The described relations have been found to link data of different authors and compositions into one global equation which (a) allows validation of glass property datasets, (b) quantifies the influences of glass components and component interactions, and (c) allows some conclusions regarding the nature of glass. Using multiple regression modeling, linear and multiplicative relations between the chemical composition and the viscosity were developed. ![]() The viscosity of over 300 compositions including soda-lime glasses, borosilicates, glasses with high alkaline earth content, NIST glass viscosity standards, lead silicates, fluorosilicates, and phospho-silicates have been examined. " Improved compositio-property relations in silicate glasses, part I: Viscosity" Older viscosity model version, glass viscosity calculation based on 780 experimental data of 300 compositions: The mixed-alkali effect for the viscosity is shown to be caused mainly not by alkali-alkali but by non-linear alkali-silica interactions.ĭownload viscosity calculator, including correlation matrices, 1.7 MBĬomparison to other glass viscosity models The prediction confidence interval largely depends on the glass composition of interest, the composition uncertainty, and the viscosity level. The developed global model corrects those errors. Similarly, in the glass transition range many experimental data of borosilicate glasses are reported too high due to phase separation effects. and the recently published "High temperature glass melt property database for process modeling" by Seward et al. It is shown that within a measurement series from a specific laboratory the reported viscosity values are often over-estimated at higher temperatures due to evaporation losses during the measurement and glass preparation, including data by Lakatos et al. "Glass Viscosity Calculation Based on a Global Statistical Modeling Approach" ( PDF, 3 MB) Ī global statistical glass viscosity model was developed for predicting the complete viscosity curve, based on more than 2200 composition-viscosity data of silicate glasses from the scientific literature, including soda-lime-silica container and float glasses, TV panel glasses, borosilicate fiber wool and E type glasses, low expansion borosilicate glasses, glasses for nuclear waste vitrification, lead crystal glasses, binary alkali silicates, and various further compositions from over half a century. Viscosity calculation based on 2200 experimental data: ![]()
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