Method for producing a glass article

US11453609B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Malte Grimm · Mitterteich, DE
• Christof Kass · Tirschenreuth, DE
• Peter Nass · Mainz, DE

Key dates

• Filing date: Apr 9, 2019
• Grant date: Sep 27, 2022
• Expiry date: Jun 14, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2203/52
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method for producing a glass article having high hydrolytic resistance is provided. A glass tube consisting of borosilicate glass and having an Al2O3 content of less than 1 weight-%, a ZrO2 content of 2-12 weight-%, and a glass transition temperature Tg is reshaped into a glass article and is subsequently subjected to a thermal post-treatment. To reduce the alkali release of the glass article, the glass article is subjected to a treatment temperature of TB≥Tg+5° K over a treatment time of tB≥5 min and is subsequently cooled during the thermal post-treatment.