Society of Glass Technology · [Sheffield] · leaf 160
is kept constant and CaO or PbO substituted weightfor weight for alkali, the solubility falls considerably, the rate ofdecrease being much greater in the PbO glasses. Fig. 15 showsthis very well. (2) When the R0 is kept constant in a glass, and silica issubstituted for alkali, there is a fall in… … 15 20 Percentage R20.Fig. 13. 15 20 Percentage R./O.Fig. 14. (3) The substitution of PbO or CaO for silica, the alkali beingkept constant, results in a fall in solubility. The rate of decreaseis approximately the same for both the lime- and lead-glasses. (4) In the lime glasses, the potash glass…
Glass
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