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US 4,366,251 AGranted
Glass compositions and their fibers
AssigneeOwens-Corning Fiberglas Corporation
InventorCharles F. Rapp
Life of this patent
Estimating the term…
Abstract
Fiberizable glass compositions are disclosed. The fibers may be produced from sand, clay, limestone, dolomite or other suitable raw materials. The fibers can be used to make low density composites for ceiling tile or boards.
Claims14
Mineral wool fibers having a composition consisting essentially by weight of:
- ______________________________________ Weight Percent ______________________________________ SiO.sub.2 38-42 Al.sub.2 O.sub.3 6-10 MgO 12-16 CaO 35-40 Fe.sub.2 O.sub.3 .ltoreq.2 Other impurities .ltoreq.2 ______________________________________
- wherein the composition consists of akermanite modified with Al.sub.2 O.sub.3 ;
- wherein the composition has a viscosity of log n=1.0 at a temperature of 2600.degree. F. or less, and
- wherein the fibers have a high softening temperature as indicated by a viscosity of log n=12.0.
1 more element
Ceiling tile or boards produced from mineral wool fibers having a composition consisting essentially by weight of:
- ______________________________________ Weight Percent ______________________________________ SiO.sub.2 38-42 Al.sub.2 O.sub.3 6-10 MgO 12-16 CaO 35-40 Fe.sub.2 O.sub.3 .ltoreq.2 Other impurities .ltoreq.2 ______________________________________
- wherein the composition consists of akermanite modified with Al.sub.2 O.sub.3 ;
- wherein the composition has a viscosity of log n=1.0 at a temperature of 2600.degree. F. or less, and
- wherein the fibers have a high softening temperature as indicated by a viscosity of log n=12.0.
1 more element
Dependencies are inferred from the claim text.