Lead- and barium-free crystal glass having high optical transmission

US5434111A · kind A · utility

Assignee

• Schott Glaswerke · DE

Inventors

• Marc Clement · Mainz, DE
• Peter Brix · Mainz, DE
• Ludwig Gaschler · Mainz, DE

Key dates

• Filing date: Apr 12, 1993
• Grant date: Jul 18, 1995
• Expiry date: Apr 12, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S501/903
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Lead- and barium-free crystal glass for the production of high-quality glasses and domestic articles, having high optical transmission, a refractive index n.sub.D of greater than 1.52, a density of at least 2.45 g/cm.sup.3, high hydrolytic resistance, good solarization resistance, and a K.sub.2 O+ZnO content of greater than 10% by weight, the glass system being based on an alkali-lime-silicate glass containing TiO.sub.2, ZrO.sub.2, Nb.sub.2 O.sub.3 and possibly Ta.sub.2 O.sub.5 and/or combinations thereof.