Patent · US Expired

Soda-lime-silicate glass composition

US6218323A · kind A · utility

26Cited by

5References

7Claims

0Family size

Assignee

Flachglas Aktiengesellschaft · DE

Inventors

Joachim Bretschneider · Idar-Oberstein, DE
Hubert Drexler · Regensburg, DE

Key dates

Filing date	Aug 12, 1999
Grant date	Apr 17, 2001
Priority date	—
Expiry date	Aug 12, 2019

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC03C3/087
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A neutral-colored soda-lime-silicate glass with high light transmission in the visible region. The glass has a basic composition which contains at least the following constituents: SiO.sub.2, 66-75 weight %; Na.sub.2 O, 10-20 weight %; CaO, 5-15 weight %; MgO, 0-6 weight %; Al.sub.2 O.sub.3, 0-5 weight %; and K.sub.2 O, 0-5 weight %; and incorporates a colorant portion comprising the following constituents: Co, 0.1-1 ppm; Fe.sub.2 O.sub.3, .ltoreq.0.03 weight % (total iron content); and FeO/Fe.sub.2 O.sub.3, >0.4. The glass possesses a light transmittance (illuminant D 65 according to DIN 67 507) of at least 89% at a reference thickness of 4 mm.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.