# US 5,348,916 A · Alkali free glass

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- Number: US 5,348,916 A
- Document ID: US5348916A
- Status: Granted
- Kind: A
- Application number: 08/152,927
- Filed: 1993-11-16
- Granted: 1994-09-20
- Earliest claimed: 1991-04-26
- Assignees: Asahi Glass Company, Limited
- Inventors: Hideki Kushitani; Manabu Nishizawa; Yasumasa Nakao
- Web page: https://patentgrep.com/patent/US5348916A

## CPC

- C03C 3/093: containing zinc or zirconium
- C03C 3/091: containing aluminium
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS

## Abstract

An alkali free glass consisting essentially of from 50 to 60 wt % of SiO.sub.2, from 8 to 16 wt % of Al.sub.2 O.sub.3, from 4 to 10 wt % of B.sub.2 O.sub.3, from 1.5 to 5 wt % of MgO, from 0 to 7 wt % of CaO, from 0 to 10 wt % of SrO, from 10 to 20 wt % of BaO and from 0 to 3 wt % of ZnO and essentially free from alkali metal oxides.

## Claims

### Claim 1

An alkali free glass prepared by a float method consisting essentially of from 53 to 57 wt % of SiO.sub.2, from 10 to 14 wt % of Al.sub.2 O.sub.3, from 5.5 to 8.5 wt % of B.sub.2 O.sub.3, from 2 to 4.5 wt % of MgO, from 2 to 5 wt % of CaO, from 2 to 8 wt % of SrO, from 12 to 18 wt % of BaO and from 0 to 2 wt % of ZnO and essentially free from alkali metal oxides.

### Claim 2 (depends on 1)

The alkali free glass of claim 1, wherein the weight percentages of the components are as follows:
______________________________________ SiO.sub.2 57 Al.sub.2 O.sub.3 11 B.sub.2 O.sub.3 6 MgO 2 CaO 2 SrO 5 BaO 15 ZnO 2 ______________________________________

### Claim 3 (depends on 1)

The alkali free glass of claim 1, wherein the weight percentages of the components are as follows:
______________________________________ SiO.sub.2 54 Al.sub.2 O.sub.3 14 B.sub.2 O.sub.3 8 MgO 2 CaO 3 SrO 6 BaO 14 ZnO -- ______________________________________

### Claim 4 (depends on 1)

The alkali free glass of claim 1 wherein the weight percentages of the components are as follows:
______________________________________ SiO.sub.2 57 Al.sub.2 O.sub.3 11 B.sub.2 O.sub.3 6 MgO 2 CaO 5 SrO 4 BaO 15 ZnO -- ______________________________________