Irregularly-shaped glass fibers and insulation therefrom
AssigneeOwens Corning Fiberglas Technology, Inc.
InventorsCharles F. Rapp, Neil M. Cameron, Ron W. Mayhew
Life of this patent
Estimating the term…
Abstract
Irregularly-shaped glass fibers and insulation therefrom comprising two different glasses having differing coefficients of thermal expansion. The irregularly-shaped dual-glass fibers exhibit a substantially uniform volume filling nature, and provide improved recovery and thermal conductivity abilities even in the absence of a binder material.
Claims10
Irregularly-shaped glass fibers suitable for insulation, each glass fiber comprising two distinct glasses, each glass having a different coefficient of thermal expansion, wherein the coefficients of thermal expansion differ by at least 2.0 ppm/.degree.C., each glass having a different glass composition and each glass composition being boron-free, wherein the first boron-free glass composition consists essentially of:
- ______________________________________ Ingredients Weight Percent ______________________________________ SiO.sub.2 35-65 Al.sub.2 O.sub.3 0-17 MgO 0-30 CaO 5-40 FeO 0-17 Na.sub.2 O + K.sub.2 O 0-10 SiO.sub.2 + Al.sub.2 O.sub.3 .gtoreq.45 .ltoreq.70 Temperature for a >2,350.degree. F. Viscosity of 10 Poise <3,400.degree. F. ______________________________________
- having a liquidus temperature at least 50.degree. F. below the 10 poise viscosity temperature;
- and the second boron-free glass composition consists essentially of:
- ______________________________________ Ingredients Weight Percent ______________________________________ SiO.sub.2 35-65 Al.sub.2 O.sub.3 0-17 MgO 0-30 CaO 5-40 FeO 0-17 Na.sub.2 O + K.sub.2 O 0-25 SiO.sub.2 + Al.sub.2 O.sub.3 .gtoreq.45 .ltoreq.70 Temperature for a >2,350.degree. F. Viscosity of 10 Poise <3,400.degree. F. ______________________________________
- having a liquidus temperature of at least 50.degree. F. below the 10 poise viscosity temperature.
Dependencies are inferred from the claim text.