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US 8,418,505 B2Granted
High alkali glass composition
AssigneeJohns Manville
InventorsJeffrey Shock, Elam Leed, Jonathan McCann
Life of this patent
Estimating the term…
Abstract
A glass composition useful in preparing fiberglass comprises 12 to 25 weight % CaO; 12 to 16 weight % Al2O3; 52 to 62 weight % SiO2; 0.05 to 0.8 Fe2O3; and greater than 2 up to about 8 weight % alkali metal oxide.
Claims20
A method of making fiberglass, the method comprising:
- providing a combination of recycled glass cullet and minerals,
- heating the combination to a melting temperature for the recycled glass cullet and minerals to form a molten material;
- forming the molten material into fiberglass, wherein the fiberglass comprises
- 12 to 25 weight % CaO,
- 12 to 16 weight % Al2O3,
- 52 to 62 weight % SiO2,
- 0.05 to 0.8 weight % Fe2O3, and
- 3 to about 8 weight % alkali metal oxide, wherein the alkali metal oxide comprises at least 3 weight percent sodium oxide.
5 more elements
The method of claim l, wherein the fiberglass has a liquidus temperature at least 140° F. less than the Tlog3 temperature of the fiberglass.
Dependencies are inferred from the claim text.