# US 4,396,722 A · Wool glass composition

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,396,722 A
- Document ID: US4396722A
- Status: Granted
- Kind: A
- Application number: 06/365,705
- Filed: 1982-04-05
- Granted: 1983-08-02
- Earliest claimed: 1982-04-05
- Assignees: Owens-Corning Fiberglas Corporation
- Inventors: Charles F. Rapp
- Web page: https://patentgrep.com/patent/US4396722A

## CPC

- C03C 13/00: Fibre or filament compositions (manufacture of fibres or filaments C03B37/00)
- 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

Fiberizable glass compositions are disclosed. The glass compositions are boron-free wool glasses which are useful as insulation. The glass batch used to prepare these glass compositions contains high amounts of iron oxide.

## Claims

### Claim 1

Boron-free glass fibers consisting essentially of, by weight:
______________________________________ Ingredients Weight Percent ______________________________________ SiO.sub.2 56.0-64.0 Al.sub.2 O.sub.3 3.0-6.0 Na.sub.2 O 16.0-22.0 K.sub.2 O 0.0-2.0 CaO 3.0-14.0 MgO 1.0-7.0 FeO + Fe.sub.2 O.sub.3 4.1-10.0 ______________________________________
and up to several percent of each of other substituents including TiO.sub.2, ZnO, SO.sub.3, Li.sub.2 O, MnO, SrO and BaO having a viscosity of log n=2.5 at a temperature of about 1232.degree. C. or less and a liquidus temperature of about 1094.degree. C. or less.

### Claim 2

Boron-free glass fibers consisting essentially of, by weight:
______________________________________ Ingredients Weight Percent ______________________________________ SiO.sub.2 57.0-64.0 Al.sub.2 O.sub.3 3.0-5.0 Na.sub.2 O 16.0-20.0 K.sub.2 O 0.0-1.5 CaO 4.0-10.0 MgO 1.5-6.5 FeO + Fe.sub.2 O.sub.3 4.1-8.0 ______________________________________
and up to several percent each of other substituents including TiO.sub.2, ZnO, So.sub.3, Li.sub.2 O, MnO, SrO and BaO having a viscosity of log n=2.5 at a temperature of about 1232.degree. C. or less and a liquidus temperature of about 1094.degree. C. or less.

### Claim 3

Boron-free glass fibers consisting of, by weight:
______________________________________ Ingredients Weight Percent ______________________________________ SiO.sub.2 61.0 Al.sub.2 O.sub.3 4.5 Na.sub.2 O 19.7 K.sub.2 O 0.3 CaO 7.6 MgO 1.6 FeO + Fe.sub.2 O.sub.3 4.2 ______________________________________

### Claim 4

Boron-free glass fibers consisting essentially of, by weight:
______________________________________ Ingredients Weight Percent ______________________________________ SiO.sub.2 61.1 Al.sub.2 O.sub.3 4.4 Na.sub.2 O 17.7 K.sub.2 O 0.3 CaO 7.2 MgO 4.5 FeO + Fe.sub.2 O.sub.3 4.1 ______________________________________

### Claim 5

Boron-free glass fibers consisting essentially of, by weight:
______________________________________ Ingredients Weight Percent ______________________________________ SiO.sub.2 61.0 Al.sub.2 O.sub.3 4.4 Na.sub.2 O 19.7 K.sub.2 O 0.3 CaO 5.9 MgO 3.7 FeO + Fe.sub.2 O.sub.3 4.1 ______________________________________

### Claim 6

Boron-free glass fibers consisting essentially of, by weight:
______________________________________ Ingredients Weight Percent ______________________________________ SiO.sub.2 61.1 Al.sub.2 O.sub.3 4.4 Na.sub.2 O 21.7 K.sub.2 O 0.3 CaO 4.7 MgO 2.9 FeO + Fe.sub.2 O.sub.3 4.1 ______________________________________

### Claim 7

Boron-free glass fibers consisting essentially of, by weight:
______________________________________ Ingredients Weight Percent ______________________________________ SiO.sub.2 59.4 Al.sub.2 O.sub.3 4.4 Na.sub.2 O 17.7 K.sub.2 O 0.3 CaO 8.1 MgO 5.1 FeO + Fe.sub.2 O.sub.3 4.1 ______________________________________

### Claim 8

Boron-free glass fibers consisting essentially of, by weight:
______________________________________ Ingredients Weight Percent ______________________________________ SiO.sub.2 59.4 Al.sub.2 O.sub.3 4.4 Na.sub.2 O 19.7 K.sub.2 O 0.3 CaO 6.9 MgO 4.3 FeO + Fe.sub.2 O.sub.3 4.1 ______________________________________

### Claim 9

Boron-free glass fibers consisting essentially of, by weight:
______________________________________ Ingredients Weight Percent ______________________________________ SiO.sub.2 59.4 Al.sub.2 O.sub.3 4.4 Na.sub.2 O 21.7 K.sub.2 O 0.3 CaO 5.7 MgO 3.5 FeO + Fe.sub.2 O.sub.3 4.1 ______________________________________