COMPOSITION FOR GLASS FIBER, GLASS FIBER, GLASS-FIBER-CONTAINING COMPOSITE MATERIAL CONTAINING GLASS FIBER, AND METHOD FOR MANUFACTURING GLASS FIBER

摘要

Provided is a composition for a glass fiber which has a high elastic modulus and satisfactory productivity, and can facilitate the production of a fine-count glass fiber. The composition for a glass fiber of the present invention includes, as a glass composition expressed as a mass percent in terms of oxide, 50% to 70% of SiOsub2/sub, 15% to 25% of Alsub2/subOsub3/sub, 3% to 13% of MgO, 3% to 15% of CaO, and 0.5% to 5% of Bsub2/subOsub3/sub.