Patent ID: 6391810
Filing Date: 2002-05-21
Classification: C03C,Y10S

Abstract:
Lead- and barium free crystal glass for the manual or machine production of high-grade glass objects with a refractive index higher than 1.52 and a density of at least 2.45 g/cc, wherein the crystal glass comprises the following components, in weight percentSiO259.0-71.0TiO20.001-8.0â€ƒAl2O30.01-4.0â€‚CaOâ€‚2.0-10.0MgO0.5-8.0ZnO0.01-11.0K2O0.08-11.0Na2Oâ€‚3.0-15.5Sb2O3 or As2O30.001-1.5â€ƒSrO0.001-0.1â€ƒB2O30.01-3.0â€‚Li2O0.01-2.0â€‚SO42âˆ’0.0008-1.2â€ƒâ€‚Fâˆ’0.008-0.2â€ƒand at least two components selected from the group consisting of Er2O3, Nd2O3, CeO2, CoO, Pr2O3, SeO, NiO and MnO and has a moisture content of 0.025 to 0.07% by weight.