Glass composition for glass fibers, glass fibers, glass fiber fabric, and glass fiber-reinforced resin composition
To provide a glass composition for glass fiber having a low dielectric loss tangent, suppressing the occurrence of phase separation, having a reduced viscosity at high temperatures, and reducing the occurrence of striae. The glass composition for glass fiber includes 52.0 to 57.5% by mass of SiO 2 , 19.5 to 25.5% by mass of B 2 O 3 , 8.0 to 13.0% by mass of Al 2 O 3 , 0 to 2.0% by mass of MgO, 0 to 6.0% by mass of CaO, 0.5 to 6.5% by mass of SrO, and 0.1 to 3.0% by mass of TiO 2 , the ratio of Al 2 O 3 to B 2 O 3 is 0.35 to 0.54, and the content SI of SiO 2 , the content B of B 2 O 3 , the content M of MgO, the content C of CaO, the content SR of SrO, and the content T of TiO 2 satisfy the following formula (1): 6.90≤100×(B/SI) 2 ×{SR/(C+SR)} 2/3 ×{T/(M+T)} 1/2 ≤12.30 (1).
1 . A glass composition for glass fiber comprising:
SiO 2 in a range of 52.0% by mass or more and 57.5% by mass or less;
B 2 O 3 in a range of 19.5% by mass or more and 25.5% by mass or less;
Al 2 O 3 in a range of 8.0% by mass or more and 13.0% by mass or less;
MgO in a range of 0% by mass or more and 2.0% by mass or less;
CaO in a range of 0% by mass or more and 4.9% by mass or less;
SrO in a range of 0.5% by mass or more and 6.5% by mass or less;
TiO 2 in a range of 0.1% by mass or more and 3.0% by mass or less; and
ZnO in a range of 0% by mass or more and 0.5% by mass or less with respect to a total amount, wherein
a ratio of a content of Al 2 O 3 (% by mass) to a content of B 2 O 3 (% by mass), (Al 2 O 3 /B 2 O 3 ), is in a range of 0.35 to 0.54, and
a content SI (% by mass) of SiO 2 , a content B (% by mass) of B 2 O 3 , a content M (% by mass) of MgO, a content C (% by mass) of CaO, a content SR (% by mass) of SrO, and a content T (% by mass) of TiO 2 satisfy following formula (1):
6.90≤100×( B/SI ) 2 ×{SR /( C+SR )} 2/3 ×{T /( M+T )} 1/2 ≤12.30 (1).
2 . The glass composition for glass fiber according to claim 1 , wherein the SI, B, M, C, SR, and T satisfy following formula (2):
9.56≤100×( B/SI ) 2 ×{SR /( C+SR )} 2/3 ×{T /( M+T )} 1/2 ≤11.77 (2).
3 . The glass composition for glass fiber according to claim 2 , wherein the SI, B, M, C, SR, and T satisfy following formula (3):
10.00≤100×( B/SI ) 2 ×{SR /( C+SR )} 2/3 ×{T /( M+T )} 1/2 ≤11.35 (3).
4 . The glass composition for glass fiber according to claim 3 , wherein the SI, B, M, C, SR, and T satisfy following formula (4):
10.15≤100×( B/SI ) 2 ×{SR /( C+SR )} 2/3 ×{T /( M+T )} 1/2 ≤10.85 (4).
5 . The glass composition for glass fiber according to claim 4 , wherein the SI, B, M, C, SR, and T satisfy following formula (5):
10.35≤100×( B/SI ) 2 ×{SR /( C+SR )} 2/3 ×{T /( M+T )} 1/2 ≤10.78 (5).
6 . Glass fiber formed from the glass composition for glass fiber according to claim 1 .
7 . A glass fiber woven fabric comprising the glass fiber according to claim 6 .
8 . A glass fiber-reinforced resin composition comprising the glass fiber according to claim 6 .