| 摘要 |
PROBLEM TO BE SOLVED: To provide a glass fiber which is free from volatile components such as ZnO, B2O3 and F2, does not cause environmental pollution and which is excellent in chemical durability and high in productivity. SOLUTION: The glass fiber contains, by mole, 56 to 63% SiO2, 4 to 9% Al2O3, 0.1 to 3% ZrO2, however, the amount of SiO2+ZrO2-Al2O3 being not less than 52%, 1 to 7% MgO, 21 to 28% CaO, 0 to 1.5% Na2O, and 0 to 1.5% K2O, however, the amount of Na2O+K2O being not more than 1.5%, and is substantially free from ZnO, B2O3 and F2.
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