Lead- and barium-free crystal glass
AssigneeF. X. Nachtmann Bleikristallwerke GmbH
InventorArmin Lenhart
Life of this patent
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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 percent. SiO2 59.0-71.0 TiO2 0.001-8.0 Al2O3 0.01-4.0 CaO 2.0-10.0 MgO 0.5-8.0 ZnO 0.01-11.0 K2O 0.08-11.0 Na2O 3.0-15.5 Sb2O3 or AS2O3 0.001-1.5 SrO 0.001-0.1 B2O3 0.01-3.0 Li2O 0.01-2.0 SO42− 0.0008-1.2 F− 0.008-0.2 as well as 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.
Claims7
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 percent
- SiO2 59.0-71.0 TiO2 0.001-8.0 Al2O3 0.01-4.0 CaO 2.0-10.0 MgO 0.5-8.0 ZnO 0.01-11.0 K2O 0.08-11.0 Na2O 3.0-15.5 Sb2O3 or As2O3 0.001-1.5 SrO 0.001-0.1 B2O3 0.01-3.0 Li2O 0.01-2.0 SO42− 0.0008-1.2 F− 0.008-0.2
- and 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.
The lead- and-barium-free crystal glass of and in percent by weight
- Er2O3 0.00001-0.01 Nd2O3 0.00001-0.01 CeO2 0.001-0.2 CoO 0.00001-0.01 Pr2O3 0.00001-0.01 SeO 0.0001-0.02 NiO 0.00001-0.01 MnO 0.001-0.05.
Dependencies are inferred from the claim text.