Society of Glass Technology · [Sheffield] · leaf 137
t of the CaOis substituted by PbO is a matter for further investigation. 70 JOURNAL OF THE SOCIETY OF GLASS TECHNOLOGY. when PbO is substituted for R20 than CaO, and is greater whenK20 is replaced than when the replaced alkali oxide is Na20. Fig. 3 shows that the rise due to the substitution of R0… … Demfa ojtkFWand CaO 2-8 2-6 2-5 5 10 15 Percentage R0. Fig. 3. 10 15 20 Percentage R0. Fig. 4. CaO for R20 affects the density much less than the substitutionof PbO. The following constants are of note.* In a series of glasses ofthe oSi02,6R20,cR0 type, where {a -f b + c) = 100 per cent, whenthe…
Glass
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