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AssigneeFuji Fibre Glass Company, Ltd.
InventorsMasahiro Kondo, Suguru Takehara, Tsutomu Mitsufuji, Moritosi Sasaki, Tomoji Takura
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Alkali-resistant compositions for forming glass fibers characterized by comprising, in molecular weight percentage, 58-77% of SiO.sub.2, 4-11% of ZrO.sub.2, 16-24% of an alkali metal oxide and 0.5-3.5% of at least one oxide selected from the group consisting of oxides of iron and oxides of copper, with the proviso that the molecular weight percentages of the oxides of iron and the oxides of copper are calculated in terms of the chemical formulas Fe.sub.2 O.sub.3 and CuO, respectively. Alkali-resistant compositions for forming glass fibers characterized by comprising in molecular weight percentage, 56-74% of SiO.sub.2, 4-6.9% of ZrO.sub.2, 11-20% of an alkali metal oxide, 0.5-3.5% of at least one oxide selected from the group consisting of oxides of iron and oxides of copper with the proviso that the molecular weight percentages of the oxides of iron and the oxides of copper are calculated in terms of the chemical formulas Fe.sub.2 O.sub.3 and CuO, respectively, and up to 12% of an alkaline earth metal oxide.
An alkali-resistant composition for forming glass fibers consisting essentially of, by molecular weight percentage, 58-77% of SiO.sub.2, 4-11% of ZrO.sub.2, 16-24% of at least one of alkali metal oxides and 0.5-3.5% of at least one oxide selected from the group consisting of an oxide of iron and an oxide of copper, with the proviso that the molecular weight percentages of the oxide of iron and oxide of copper are calculated in terms of the chemical formulas Fe.sub.2 O.sub.3 and CuO, respectively.
An alkali-resistant composition for forming glass fibers consisting essentially of, by molecular weight percentage, 56-74% of SiO.sub.2, 4-6.9% of ZrO.sub.2, 11-20% of at least one of alkali metal oxides, 0.5-3.5% of at least one oxide selected from the group consisting of an oxide of iron and an oxide of copper, with the proviso that the molecular weight percentages of the oxide of iron and the oxide of copper are calculated in terms of the chemical formulas Fe.sub.2 O.sub.3 and CuO, respectively, and up to 12% of at least one alkaline earth metal oxide.
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