The heterogeneous structure due to liquid-liquid phase separation in low-alkali borosilicate glasses of the SiO2-B2O3-Na2O system is now undoubted, but the compositions of the coexisting glass phases in these glasses have not been conclusively determined. The low chemical stability of one of the phases gives the impression that the components of this phase can be isolated completely by treatment with particular chemical reagents (acid or alkali), and its chemical composition determined. However, this disregards the possibility of precipitation of some of the components within the porous framework, or the possibility of action on the components of the framework, leading to dissolution and addition to the other phase.


Sodium Silicate Sodium Borate Phase Rule Approximate Composition Vitreous Silica 
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Copyright information

© Consultants Bureau, New York 1973

Authors and Affiliations

  • B. G. Varshal

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