| 摘要 |
PROBLEM TO BE SOLVED: To provide a glass fiber for print circuit board having low dielectric constant and low dielectric tangent, and excellent in meltability and spinnability of glass. SOLUTION: This glass fiber having low dielectric constant and low dielectric tangent comprises in mol% 47.0 to 67.0 of SiO2, 6.0 to 15.0 of Al2O3, 10.0 to 30.0 of B2O3, 6.0 to 11.0 of MgO, and 5.0 to 9.0 of CaO whereas comprising substantially no alkali nor fluorine.
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