Granular quartz glass product

US4243422A · kind A · utility

Assignee

• Dynamit Nobel GmbH · DE

Inventors

• Arnold Lenz · Kornwestheim, DE
• Gerhard Kreuzburg · Niederkassel, DE
• Rainer Haase · Nortorf, DE

Key dates

• Filing date: Dec 14, 1977
• Grant date: Jan 6, 1981
• Expiry date: Dec 14, 1997

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S65/901
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Method of preparing granular quartz glass which comprises heating a porous granulated silica gel having an alkoxy group content equal to or less than 1 weight percent and a total impurity content of less than 1 part per million, the porous granulated silica gel obtained by hydrolysis of an orthosilicic acid ester of an aliphatic alcohol at a temperature up to 1400.degree. C.