Studies on Chemical Compositions and Water Solubilities of Glasses, (X)

Abstract

The authors, in continuing the previous studies on the relation between chemical compositions and water solubilities of glasses, reported the results of further studies on the water solubility or water resisting degree of prepared test glasses containing titanium dioxide TiO2 in amounts of 2, 4, 6 or 8% by replacing the same amount of lime, silica or both of them in the standard soda lime-silica glass (Na2O: 15%, CaO: 13%, and SiO2: 72%). The tests were carried out by the powder method with variuos heating conditions in water, as following: (1) under the atmospheric pressure on water bath, and (2) under the hydrothermal pressure of superheated steam in the closed autoclave by the following four cases, (a) 8 atm. and about at 172°C, (b) 17 atm. and about at 205°C, (c) 25 atm. and about at 225°C, and 40 atm. and about at 251°C. The results of these experiments, (1) cc of titrated N/50-H2SO4 solution, (2) the percentage (A) of dissolved sodium oxide Na2O by the calculation, (3) the percentage of weight decrease (WD) of dissolved Na2O and SiO2, and (4) the percentage of (A)/(WD) of the dissolved Na2O (A) to the weight decrease (WD) were obtained and fully discussed. Thesse result were compared with those reported in the previons report IX. (Department of Applied Chemistry, First Faculty of Engineering, University of Tokyo) (Feb. 18, 1951)