Nitto Boseki Co., Ltd.

Jun Ito

Tadashi Kurita

Takashi Nonaka

Norio Hirayama

Takanobu Hosokawa

Koichi Nakamura

Hidero Unuma

Tatsuya Komukai

Kazuaki Takagi

To provide a glass composition for glass fiber that includes biosolubility, can achieve long fiber formation, and can provide a glass filament with sufficiently high strength even when exposed to water and a high temperature and high humidity environment. The glass composition for glass fiber of the present invention includes 35.00 to 50.00% by mass of SiO, 12.00 to 28.00% by mass of AlO, 10.00 to 25.00% by mass of BO, 2.00 to 18.00% by mass of MgO, and 5.00 to 25.00% by mass of CaO, with respect to the total amount, and the total content of MgO and CaO is 17.09 to 30.00% by mass and MgO/CaO is 0.29 to 1.92.

Glass composition for glass fiber, glass fiber, glass fiber woven fabric, and glass fiber reinforced resin composition

A glass composition for glass fiber includes NbOof 0.0001 to 0.3500% by mass, and SOof 0.0010 to 0.0100% by mass with respect to a total amount of the glass composition for glass fiber, wherein assuming that a rest of the total amount excluding SOand NbOis 100 parts by mass, the glass composition for glass fiber includes SiOof 48.0 to 60.0 parts by mass, BOof 18.4 to 27.0 parts by mass, AlOof 10.8 to 17.0 parts by mass, MgO of 0 to 2.5 parts by mass, CaO of 0. to 6.0 parts by mass, SrO of 0 to 4.5 parts by mass, TiOof 0.5 to 3.5 parts by mass, and Fand Clof 0 to 2.5 parts by mass in total, and a ratio SO/NbOis 0.07 to 13.70.

Glass composition for glass fibers, glass fibers, glass fiber textile, and glass fiber-reinforced resin composition

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Koriyama, Japan

Jun Ito