| http://www.w3.org/ns/prov#value | - ich has the following composition by weight: 62% SiO.sub.2, 10% Al.sub.2 O.sub.3, 1% ZrO.sub.2, 1% TiO.sub.2, 9% Na.sub.2O, 9% K.sub.2 O, 4% MgO, and 4% ZnO.The tremendous melting advantage of the glasses of the present invention such as specified above in Examples 1 and 2 over the commercially available ion exchange glass and the ion exchange glass of the prior art is obvious.
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