The present disclosure provides a novel glass composition that has a low permittivity and is suitable for mass production. A glass composition provided satisfies, in wt %, for example, 40≤SiO.sub.2≤60, 25≤B.sub.2O.sub.3≤45, 0<Al.sub.2O.sub.3≤18, 0<R.sub.2O≤5, and 0≤RO≤12, and satisfies at least one of: i) SiO.sub.2+B.sub.2O.sub.3≥80 and SiO.sub.2+B.sub.2O.sub.3+Al.sub.2O.sub.3≤99.9; and ii) SiO.sub.2+B.sub.2O.sub.3≥78, SiO.sub.2+B.sub.2O.sub.3+Al.sub.2O.sub.3≤99.9, and 0<RO<10. Another glass composition provided includes SiO.sub.2, B.sub.2O.sub.3, Al.sub.2O.sub.3, R.sub.2O, and 3<RO<8 at the same contents as the above, and satisfies SiO.sub.2+B.sub.2O.sub.3≥75 and SiO.sub.2+B.sub.2O.sub.3+Al.sub.2O.sub.3<97, where R.sub.2O=Li.sub.2O+Na.sub.2O+K.sub.2O and RO=MgO+CaO+SrO.

A glass composition for glass fiber includes SiO.sub.2 in the range of 52.0% by mass or more and 56.0% by mass or less; B.sub.2O.sub.3 in the range of 21.0% by mass or more and 24.5% by mass or less; Al.sub.2O.sub.3 in the range of 9.5% by mass or more and 13.0% by mass or less; MgO in the range of 0% by mass or more and less than 1.0% by mass; CaO in the range of 0.5% by mass or more and 5.5% by mass or less; SrO in the range of 0.5% by mass or more and 6.0% by mass or less; and TiO.sub.2 in the range of 0.1% by mass or more and 3.0% by mass or less; and includes F.sub.2 and Cl.sub.2 in the range of 0.1% by mass or more and 2.0% by mass or less in total, with respect to the total amount.

Methods of making a bioactive glass fiber include forming a melt of a glass composition including: 50 to 70% SiO.sub.2; 0.1 to 10% Al.sub.2O.sub.3, 5 to 30% Na.sub.2O, 0.1 to 15% K.sub.2O, 0.1 to 15% MgO, 0.1 to 20% CaO, and 5 to 10% P.sub.2O.sub.5, based on a 100 wt % of the glass composition. The melt has a viscosity of from 200 Poise to 2,000 Poise. Methods include drawing the melt into a drawn glass fiber. Bioactive glass compositions include: 60 to 70% SiO.sub.2; 15 to 30% Na.sub.2O, 5 to 15% K.sub.2O, 1 to 10% CaO, and 5 to 10% P.sub.2O.sub.5, based on a 100 wt % of the glass composition.

A system for precoating a preform for drawing optical fiber including a diameter sensor to determine a diameter of pulled optical fiber, a cooling system to cool the optical fiber once it is pulled from a furnace, a coating system to apply a coating to the optical fiber once it has cooled and an ultra-violet lamp to cure the coating.

A glass composition is provided that includes SiO.sub.2 in an amount from 50.0 to 65.0% by weight; Al.sub.2O.sub.3 in an amount from 18.0 to 23.0% by weight; CaO in an amount from 1 to 8.5% by weight; MgO in an amount from 9.0 to 14.0% by weight; Na.sub.2O in an amount from 0.0 to 1.0% by weight; K.sub.2O in an amount from 0.0 to 1.0% by weight; Li.sub.2O in an amount from 0.1 to 4.0% by weight; TiO.sub.2 in an amount from 0.0 to 2.5% by weight, Y.sub.2O.sub.3 in an amount from 0 to 10.0% by weight; La.sub.2O.sub.3 in an amount from 0 to 10.0% by weight; Ce.sub.2O.sub.3 in an amount from 0 to 5.0% by weight; and Sc.sub.2O.sub.3 in an amount from 0 to 5.0% by weight. Glass fibers formed from the inventive composition may be used in applications that require high stiffness and have elastic modulus between 88 and 115 GPa. Such applications include woven fabrics for use in forming wind turbine blades and aerospace structures.

A glass composition is provided that includes SiO.sub.2 in an amount from 50.0 to 65.0% by weight; Al.sub.2O.sub.3 in an amount from 18.0 to 23.0% by weight; CaO in an amount from 1 to 8.5% by weight; MgO in an amount from 9.0 to 14.0% by weight; Na.sub.2O in an amount from 0.0 to 1.0% by weight; K.sub.2O in an amount from 0.0 to 1.0% by weight; Li.sub.2O in an amount from 0.1 to 4.0% by weight; TiO.sub.2 in an amount from 0.0 to 2.5% by weight, Y.sub.2O.sub.3 in an amount from 0 to 10.0% by weight; La.sub.2O.sub.3 in an amount from 0 to 10.0% by weight; Ce.sub.2O.sub.3 in an amount from 0 to 5.0% by weight; and Sc.sub.2O.sub.3 in an amount from 0 to 5.0% by weight. Glass fibers formed from the inventive composition may be used in applications that require high stiffness and have elastic modulus between 88 and 115 GPa. Such applications include woven fabrics for use in forming wind turbine blades and aerospace structures.

A bioactive glass composition including: 50 to 70% SiO.sub.2; 0.1 to 10% Al.sub.2O.sub.3, 5 to 30% Na.sub.2O, 0.1 to 15% K.sub.2O, 0.1 to 15% MgO, 0.1 to 20% CaO, and 5 to 10% P.sub.2O.sub.5, based on a 100 wt % of the composition. Also disclosed is a method of making the bioactive glass composition.

A system for precoating a preform for drawing optical fiber including a diameter sensor to determine a diameter of pulled optical fiber, a cooling system to cool the optical fiber once it is pulled from a furnace, a coating system to apply a coating to the optical fiber once it has cooled and an ultra-violet lamp to cure the coating.

A system for precoating a preform for drawing optical fiber including a diameter sensor to determine a diameter of pulled optical fiber, a cooling system to cool the optical fiber once it is pulled from a furnace, a coating system to apply a coating to the optical fiber once it has cooled and an ultra-violet lamp to cure the coating.

A glass composition is provided that includes about 55.0 to 60.4% by weight SiO.sub.2, about 19.0 to 25.0% by weight Al.sub.2O.sub.3, about 8.0 to 15.0% by weight MgO, about 7 to 12.0% by weight CaO, less than 0.5% by weight Li.sub.2O, 0.0 to about 1.0% by weight Na.sub.2O, and 0 to about 1.5% by weight TiO.sub.2. The glass composition has a fiberizing temperature of no greater than about 2,500° F. Glass fibers formed from the inventive composition may be used in applications that require high stiffness, and low weight. Such applications include woven fabrics for use in forming wind blades and aerospace structures.