Glass compositions having high KI values and fibers therefrom
AssigneeOwens Corning Fiberglas Technology, Inc.
InventorStephanie M. Mattson
Life of this patent
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Abstract
A fiberizable glass composition which has a KI value .gtoreq.40, while possessing acceptable processing properties such as viscosity and liquidus temperatures is provided. The glass composition processes well in the furnace with acceptably low levels of foaming and is readily fiberizable. The glass has a high boron content, a high soda content, and contains only small amounts of alumina. Further, the glass contains small amounts of barium sulfate which improves the durability of the glass fibers in use.
Claims24
A fiberizable glass composition suitable for insulation consisting essentially of:
- ______________________________________ Ingredient Weight Percent ______________________________________ SiO.sub.2 53.0 to 58.0 Al.sub.2 O.sub.3 0.75 to 2.0 CaO + MgO 6.0 to 14.0 Na.sub.2 O + K.sub.2 O 14.0 to 22.0 B.sub.2 O.sub.3 10.0 to 14.0 BaO 0.5 to <1.0 SO.sub.3 greater than 0 to 0.5 ______________________________________
- wherein the glass composition has a KI value equal to or greater than 40 and barium sulfate is used as a source of said BaO in said glass composition.
Glass fiber insulation comprising soda lime borosilicate glass fibers having a glass composition consisting essentially of:
- ______________________________________ Ingredient Weight Percent ______________________________________ SiO.sub.2 53.0 to 58.0 Al.sub.2 O.sub.3 0.75 to 2.0 CaO + MgO 6.0 to 14.0 Na.sub.2 O + K.sub.2 O 14.0 to 22.0 B.sub.2 O.sub.3 10.0 to 14.0 BaO 0.5 to <1.0 SO.sub.3 greater than 0 to 0.5 ______________________________________
- wherein the glass composition have a KI value equal to or greater than 40 and barium sulfate is used as a source of said BaO in said glass composition.
A process for the preparation of a fiberizable glass composition suitable for insulation comprising the steps of providing a fiberizable glass composition consisting essentially of:
- ______________________________________ Ingredient Weight Percent ______________________________________ SiO.sub.2 53.0 to 58.0 Al.sub.2 O.sub.3 0.75 to 2.0 CaO + MgO 6.0 to 14.0 Na.sub.2 O + K.sub.2 O 14.0 to 22.0 B.sub.2 O.sub.3 10.0 to 14.0 BaO 0.5 to <1.0 SO.sub.3 greater than 0 to 0.5 ______________________________________
- wherein the glass composition has a KI value equal to or greater than 40 and barium sulfate is used as a source of said BaO in said glass composition, heating said composition to melt it, and fiberizing said glass composition.
A fiberizable glass composition comprising:
- ______________________________________ Ingredient Weight Percent ______________________________________ SiO.sub.2 53.0 to 58.0 Al.sub.2 O.sub.3 0.75 to 2.0 CaO + MgO 6.0 to 14.0 Na.sub.2 O + K.sub.2 O 14.0 to 22.0 B.sub.2 O.sub.3 10.0 to 14.0 BaO 0.5 to <1.0 SO.sub.3 greater than 0 to 0.5 ______________________________________
- wherein the glass composition has a KI value equal to or greater than 40 and barium sulfate is used as a source of said BaO in said composition.
Dependencies are inferred from the claim text.