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This investigation is disclosed a type of borosilicate opal glasses that provide new compositions of borosilicate glasses, opacified with P2O5, which have high chemical durability and low thermal expansion coefficient, with the general composition SiO2 73.0, B2O3 11.70, Al2O3 3.30, P2O5 1.30, Na2O (9.6-(X+Y)), CaO (X=0.1-050) and BaO (Y=4.52.9)wt%. Effects of Na2O, CaO and BaO, which are available in glass, were examined in acidic, water and steam leaching, and alkaline corrosion. The results showed ideal properties which were dependent to the limited ratio of Na2O/ BaO + CaO. This research has been scaled-up in the laboratory successfully and has been registered as patent No. 49441 in 28 June 2008 in Iranian Innovations Organization.

Effect of Alkaline and Earth Oxides on the Chemical Durability of Borosilicate Opal Glasses Opacified with P2O5