An R-glass composition including SiO2 in an amount from 59.0 to 64.5% by weight, Al2O3 in an amount from 14.5 to 20.5% by weight, CaO in an amount from 11.0 to 16.0% by weight, MgO in an amount from 5.5 to 11.5% by weight, Na2O in N an amount from 0.0 to 4.0% by weight, TiO2 in an amount from 0.0 to
An R-glass composition including SiO2 in an amount from 59.0 to 64.5% by weight, Al2O3 in an amount from 14.5 to 20.5% by weight, CaO in an amount from 11.0 to 16.0% by weight, MgO in an amount from 5.5 to 11.5% by weight, Na2O in N an amount from 0.0 to 4.0% by weight, TiO2 in an amount from 0.0 to 2.0% by weight, Fe2O3 in an amount from 0.0 to 1.0% by weight, B2O3 in an amount from 0.0 to about 3.0% by weight, K2O, Fe2O3, ZrO2, and Fluorine, each of which is present in an amount from 0.0 to about 1.0% by weight, and SrO and ZnO, each of which is present in an amount from 0.0 to about 2.0% by weight. In exemplary embodiments, the glass composition does not contain lithium or boron.
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1. A composition for preparing R-glass fibers comprising: SiO2 in an amount from 60.0 to 64.5% by weight of the total composition;Al2O3 in an amount from 14.5 to 20.5% by weight of the total composition;CaO in an amount from 11.0 to 13.2% by weight of the total composition;MgO in an amount from 9.4
1. A composition for preparing R-glass fibers comprising: SiO2 in an amount from 60.0 to 64.5% by weight of the total composition;Al2O3 in an amount from 14.5 to 20.5% by weight of the total composition;CaO in an amount from 11.0 to 13.2% by weight of the total composition;MgO in an amount from 9.4 to 10.9% by weight of the total composition;Na2O in an amount from 0.0 to 4.0% by weight of the total composition; andTiO2 in an amount from 0.0 to 2.0% by weight of the total composition,wherein said composition has a ΔT of at least 60° C., a log 3 temperature from about 1285° C. to about 1320° C., and is substantially free of Li2O. 2. The composition of claim 1, further comprising B2O3 in an amount from 0.0 to about 1.0% by weight of the total composition. 3. The composition of claim 2, further comprising: K2O in an amount from 0.0 to about 1.0% by weight of the total composition. 4. The composition of claim 1, wherein said composition has a ΔT up to about 135° C. 5. The composition of claim 4, wherein said composition has a ΔT from about 75° C. to about 105° C. 6. The composition of claim 1, wherein said composition has a log 3 temperature from about 1285° C. to about 1300° C. 7. The composition of claim 1, wherein said composition has a liquidus temperature no greater than about 1330° C. 8. The composition of claim 1, wherein components of said composition are melted in a refractory tank melter. 9. The composition of claim 1, wherein said composition has a specific modulus of at least about 3.24×106 meters. 10. The composition of claim 9, wherein said composition has a specific modulus from about 3.24×106 meters to about 3.43×106 meters. 11. A continuous R-glass fiber produced from a composition comprising: SiO2 in an amount from 59.0 to 64.5% by weight of the total composition;Al2O3 in an amount from 14.5 to 20.5% by weight of the total composition;CaO in an amount from 11.0 to 12.96% by weight of the total composition;MgO in an amount from 9.4 to 10.9% by weight of the total composition;Na2O in an amount from 0.0 to 4.0% by weight of the total composition; andTiO2 in an amount from 0.0 to 2.0% by weight of the total composition,wherein said composition has a ΔT of at least 60° C. and is substantially free of Li2O, and wherein said composition has a density of between 2.606 and 2.638 g/cm3. 12. The glass fiber of claim 11, further comprising at least one of B2O3 in an amount from 0.0 to about 1.0% by weight of the total composition;K2O in an amount from 0.0 to about 1.0% by weight of the total composition. 13. A method of forming an R-glass fiber comprising: providing a molten glass composition including: SiO2 in an amount from 60.0 to 64.5% by weight of the total composition;Al2O3 in an amount from 14.5 to 20.5% by weight of the total composition;CaO in an amount from 11.0 to 13.2% by weight of the total composition;MgO in an amount from 9.4 to 10.9% by weight of the total composition;Na2O in an amount from 0.0 to 4.0% by weight of the total composition; andTiO2 in an amount from 0.0 to 2.0% by weight of the total composition,wherein said composition has a ΔT of at least 60° C., a log 3 temperature from about 1285° C. to about 1320° C., and is substantially free of Li2O; anddrawing said molten glass composition through orifices in a bushing to form an R-glass fiber. 14. The method of claim 13, further comprising B2O3 in an amount from 0.0 to about 1.0% by weight of the total composition. 15. The method of claim 13, wherein said composition has a ΔT up to about 135° C. 16. The method of claim 13, wherein said composition has a specific modulus of at least 3.24×106 meters. 17. The method of claim 13, wherein said composition has a log 3 temperature from about 1285° C. to about 1300° C. 18. The method of claim 13, further comprising: melting components of said glass composition in a refractory melter.
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이 특허에 인용된 특허 (7)
Hofmann, Douglas A.; McGinnis, Peter B., Composition for high performance glass high performance glass fibers and articles therefrom.
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