The Development of Various Types of Glass. Part V. A Comparison of the Soda-Lime-Silica and the Pota
T071-T107 (37 pages)
Glasses of the above types having been treated-separately, it remains to correlate the results obtained and deal with their likenesses and differences. All these glasses can be represented by the general molecular formula 100SiO2.xR2O.yCaO, where R2O represents the oxide of sodium, the oxide of potassium or mixtures of these two alkaline oxides. The nature of R2O determines in no inconsiderable way the properties of the glass containing it, and there are widespread differences in the relative effects of Na2O or K2O in glasses of this type. The substitution of the Na2O in glass by K2O, whether viewed from the point of view of equal molecular proportion or equal percentage proportion by weight, does not result in a glass of exactly similar properties.
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