Corning Glass Works

Henri J Meyer

Jean E Boudot

The instant invention relates to glasses suitable for optical and ophthalmic applications which can be melted and formed utilizing continuous commercial processes. The glasses exhibit indices of refraction between about 1.675-1.720, densities between about 3.1-3.4 g/cm.sup.3, Abbe numbers between about 33-36.5, viscosities at the liquidus temperature of at least about 220 poises, and very high chemical durability as evidenced by a loss of weight of less than 0.01 mg/cm.sup.2 in the American Optical test. The glasses consist essentially, in weight percent on the oxide basis, of 40-46% SiO.sub.2, 0-3% Al.sub.2 O.sub.3, 40-46% SiO.sub.2 +Al.sub.2 O.sub.3, 13-17% TiO.sub.2, 4-11% ZrO.sub.2, 0-2% MgO, 3-7% CaO, 4-8% CaO+MgO, 8-16% BaO, 0-4% SrO, 15-25% CaO+BaO+SrO, 2-10% Nb.sub.2 O.sub.5, 0-3% Li.sub.2 O, 2-7% Na.sub.2 O, 3-8% K.sub.2 O, 5-12% Li.sub.2 O+Na.sub.2 O+K.sub.2 O.

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Avon, France

Henri J Meyer