Low pollution glass fiber compositions
AssigneePPG Industries, Inc.
InventorHomer E. Neely, Jr.
Life of this patent
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Abstract
Novel glass fiber forming compositions are disclosed having a reduced fluorine level. These compositions substantially reduce emissions of fluorine containing gas from glass furnaces when the batch is melted. Lithium oxide is added to the novel composition to reduce the softening point and liquidus temperatures of the composition. The resultant composition is found to be a highly desirable glass which when melted can be used to produce glass fibers having excellent tensile strength.
Claims6
A glass composition consisting essentially of:
- ______________________________________ Component Percent by Weight ______________________________________ SiO.sub.2 53.5 - 57 Al.sub.2 O.sub.3 13 - 15 MgO 0 - 6 CaO 16 - 25 B.sub.2 O.sub.3 7 - 9 Na.sub.2 O 0.4 - 1 Li.sub.2 O 0.1 - 0.5 F.sub.2 0.1 - O.4. ______________________________________
A glass filament having a composition consisting essentially of:
- ______________________________________ Component Percent by Weight ______________________________________ SiO.sub.2 53.5 - 57 Al.sub.2 O.sub.3 13 - 15 MgO 0 - 6 CaO 16 - 25 B.sub.2 O.sub.3 7 - 9 Na.sub.2 O 0.4 - 1 Li.sub.2 O 0.1 - 0.5 F.sub.2 0.1 - O.4. ______________________________________
A glass composition consisting essentially of:
- ______________________________________ Component Percent by Weight ______________________________________ SiO.sub.2 56.05 Al.sub.2 O.sub.3 13.31 Fe.sub.2 O.sub.3 0.27 MgO 0.38 CaO 19.69 SrO 0.16 TiO.sub.2 0.46 B.sub.2 O.sub.3 8.48 Na.sub.2 O 0.51 K.sub.2 O 0.22 Li.sub.2 O 0.31 F.sub.2 0.26 ZrO.sub.2 0.05 ______________________________________
A glass filament having a composition consisting essentially of:
- ______________________________________ Component Percent by Weight ______________________________________ SiO.sub.2 56.05 Al.sub.2 O.sub.3 13.31 Fe.sub.2 O.sub.3 0.27 MgO 0.38 CaO 19.69 SrO 0.16 TiO.sub.2 0.46 B.sub.2 O.sub.3 8.48 Na.sub.2 O 0.51 K.sub.2 O 0.22 Li.sub.2 O 0.31 F.sub.2 0.26 ZrO.sub.2 0.05 ______________________________________
A glass composition consisting essentially of:
- ______________________________________ Component Percent by Weight ______________________________________ SiO.sub.2 56.54 Al.sub.2 O.sub.3 13.19 Fe.sub.2 O.sub.3 0.27 MgO 0.39 CaO 19.54 SrO 0.16 TiO.sub.2 0.45 B.sub.2 O.sub.3 8.26 Na.sub.2 O 0.57 K.sub.2 O 0.22 Li.sub.2 O 0.31 F.sub.2 0.12 ZrO.sub.2 0.05 ______________________________________
A glass filament having a composition consisting essentially of:
- Fe.sub.
- ______________________________________ Component Percent by Weight ______________________________________ SiO.sub.2 56.54 Al.sub.2 O.sub.3 13.19 Fe.sub.2 O.sub.3 0.27 MgO 0.39 CaO 19.54 SrO 0.16 TiO.sub.2 0.45 B.sub.2 O.sub.3 8.26 Na.sub.2 O 0.57 K.sub.2 O 0.22 Li.sub.2 O 0.31 F.sub.2 0.12 ZrO.sub.2 0.05 ______________________________________
Dependencies are inferred from the claim text.