Tube-drawable glass, method for the production and use

US12252439B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Malte Grimm · Mitterteich, DE
• Rainer Eichholz · Frankfurt, DE
• Ralf Biertümpfel · Mainz, DE

Key dates

• Filing date: Dec 18, 2020
• Grant date: Mar 18, 2025
• Expiry date: Jan 16, 2042

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B5/226
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A glass has a maximum crystallization rate (KGmax) of at most 0.20 μm/min in a temperature range of 700° C. to 1250° C. and a hydrolytic stability according to a hydrolytic class 1 HGA1 according to ISO 720:1985. In the case of a sample thickness of 2 mm of the glass, a ratio of a minimum transmittance in a wavelength range of 850 nm to 950 nm to a maximum transmittance in a wavelength range of 250 nm to 700 nm is in a range of 1.9:1 to 15:1.