Phosphate glasses for glass molds

Details Phosphate glasses for glass molds Phosphate glasses for glass molds

C - Chemistry, Metallurgy

03

C

C03C 3/16 (2006.01) C03B 11/06 (2006.01) C03C 3/17 (2006.01)

Patent

CA 2046219

This invention is particularly directed to the produc- tion of glass molds for use in press molding optically finished lenses. The inventive glass compositions consist essentially, in mole percent, of 34-56% ZnO, 4-14% Al2O3, 40-52% P2O5, and up to 15% total of optional modifying oxides including up to 5% Li2O and/or Na2O and/or K2O, up to 5% Sb2O3, and up to 15% total of CaO and/or SrO and/or BaO.

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