Glass composition for glass fiber, glass fiber, and glass fiber-reinforced resin composition using same

1. A glass composition for glass fiber comprising:

SiO 2 in a range of 52.0 to 56.6% by mass;

B 2 O 3 in a range of 20.8 to 25.5% by mass;

Al 2 O 3 in a range of 10.8 to 14.0% by mass;

SrO in a range of 2.8 to 4.1% by mass;

MgO in a range of 1.0 to 5.0% by mass;

CaO in a range of 1.0 to 3.6% by mass,

ZrO 2 less than 0.4% by mass;

less than 1.0% by mass of oxides of P, Mn, Co, Ni, Cu, Mo, W, Ce, Y, and La in total, and free of oxides of Ba; and

the total content of Na 2 O, K 2 O, and Li 2 O is less than 1.0% by mass;

and comprising

F 2 and Cl 2 in a range of 0.3 to 2.5% by mass in total,

with respect to total amount;

having a dielectric constant of 4.5 or less at a frequency of 10 GHz.

2. The glass composition for glass fiber according to claim 1 , wherein a content X (% by mass) of B 2 O 3 , a content Y (% by mass) of Al 2 O 3 , and a content Z (% by mass) of SrO satisfy following formula (1):

50.0≤( X 3 ×Y )/(1000× Z 1/2 )≤80.0  (1).

3. The glass composition for glass fiber according to claim 2 , wherein the X, Y, and Z satisfy following formula (2):

56.5≤( X 3 ×Y )/(1000× Z 1/2 )≤66.0  (2).

4. The glass composition for glass fiber according to claim 1 , wherein a content X (% by mass) of B 2 O 3 , a content Y (% by mass) of Al 2 O 3 , a content Z (% by mass) of SrO, and a total content W (% by mass) of F 2 and Cl 2 satisfy following formula (3):

50.0≤( W 1/8 ×X 3 ×Y )/(1000× Z 1/2 )≤85.0  (3).

5. The glass composition for glass fiber according to claim 4 , wherein the W, X, Y, and Z satisfy following formula (4):

55.0≤( W 1/8 ×X 3 ×Y )/(1000× Z 1/2 )≤66.0  (4).

6. Glass fiber formed from the glass composition for glass fiber according to claim 1 .

7. A glass fiber-reinforced resin composition comprising the glass fiber according to claim 6 .