An alkali-free ultrafine glass fiber formula includes the following components, in mass percentage calculated based on 100 Kg: SiO2: 50% to 65%, Al.sub.2O.sub.3: 10% to 16.5%, CaO: 17% to 28%, MgO: 0.2% to 4.0%, Na.sub.2O and K.sub.2O: 0.1% to 0.8% in total, CeO.sub.2: 0.1% to 0.5%, Li.sub.2O: 0.1% to 0.7%, Fe.sub.2O.sub.3: 0.05% to 0.6%, TiO.sub.2: 0.1% to 1%, and impurities: the balance. In the preparation of alkali-free ultrafine glass fibers, no fluorine and boron-containing raw materials are used, and CeO.sub.2 and Li.sub.2O are introduced, which avoids the use of B.sub.2O.sub.3 and F that have a large impact on the environment, and reduces environmental pollution. A single fiber strength of prepared glass fibers is about 9% higher than that of the traditional E glass fibers, and the comprehensive performance of a prepared glass fiber product is significantly superior than that of the existing E glass fiber product.

An alkali-free ultrafine glass fiber formula includes the following components, in mass percentage calculated based on 100 Kg: SiO2: 50% to 65%, Al.sub.2O.sub.3: 10% to 16.5%, CaO: 17% to 28%, MgO: 0.2% to 4.0%, Na.sub.2O and K.sub.2O: 0.1% to 0.8% in total, CeO.sub.2: 0.1% to 0.5%, Li.sub.2O: 0.1% to 0.7%, Fe.sub.2O.sub.3: 0.05% to 0.6%, TiO.sub.2: 0.1% to 1%, and impurities: the balance. In the preparation of alkali-free ultrafine glass fibers, no fluorine and boron-containing raw materials are used, and CeO.sub.2 and Li.sub.2O are introduced, which avoids the use of B.sub.2O.sub.3 and F that have a large impact on the environment, and reduces environmental pollution. A single fiber strength of prepared glass fibers is about 9% higher than that of the traditional E glass fibers, and the comprehensive performance of a prepared glass fiber product is significantly superior than that of the existing E glass fiber product.

A composite has repeating domains of an inorganic glass and a polymer, such that the inorganic glass and the polymer each have a glass transition temperature (T.sub.g) or softening temperature of less than 450° C., and at least 50% of the inorganic glass domains have a length of less than 30 μm as measured along at least one cross-sectional dimension.

A composite has repeating domains of an inorganic glass and a polymer, such that the inorganic glass and the polymer each have a glass transition temperature (T.sub.g) or softening temperature of less than 450° C., and at least 50% of the inorganic glass domains have a length of less than 30 μm as measured along at least one cross-sectional dimension.

A composition includes: 30 mol % to 60 mol % SiO.sub.2; 15 mol % to 35 mol % Al.sub.2O.sub.3; 5 mol % to 25 mol % Y.sub.2O.sub.3; 0 mol % to 20 mol % TiO.sub.2; and 0 mol % to 25 mol % R.sub.2O, such that R.sub.2O is the sum of Na.sub.2O, K.sub.2O, Li.sub.2O, Rb.sub.2O, and Cs.sub.2O.

The disclosure relates to bioactive glasses for use in biomedical applications. In particular, the glasses described herein are phosphate glasses that show fast filling rates of dentin tubules and have advantageous release rates of metal ions, which provide advantages in antibacterial applications and wound healing.

A glass composition of the present disclosure includes, in wt %, 50≤SiO.sub.2≤56, 20≤B.sub.2O.sub.3≤30, 10≤Al.sub.2O.sub.3≤20, 3.5≤MgO+CaO≤10, and 0≤R.sub.2O≤1.0, further includes Fe.sub.2O.sub.3, and has a permittivity of less than 5.0 at a frequency of 1 MHz. R is at least one element selected from Li, Na, and K. The glass composition of the present disclosure is a low-permittivity glass composition with which the occurrence of fiber breakage during fiber forming can be reduced even when glass fibers to be formed have a small fiber diameter, and the occurrence of defects such as fiber breakage and fluffing during processing of the glass fibers can be reduced.

A glass composition of the present disclosure includes, in wt %, 50≤SiO.sub.2≤56, 20≤B.sub.2O.sub.3≤30, 10≤Al.sub.2O.sub.3≤20, 3.5≤MgO+CaO≤10, and 0≤R.sub.2O≤1.0, further includes Fe.sub.2O.sub.3, and has a permittivity of less than 5.0 at a frequency of 1 MHz. R is at least one element selected from Li, Na, and K. The glass composition of the present disclosure is a low-permittivity glass composition with which the occurrence of fiber breakage during fiber forming can be reduced even when glass fibers to be formed have a small fiber diameter, and the occurrence of defects such as fiber breakage and fluffing during processing of the glass fibers can be reduced.

A glass material with low viscosity and a low bubble content attributable to a low weight percentage of silicon dioxide includes boron trioxide (B.sub.2O.sub.3), magnesium oxide (MgO), aluminum oxide (Al.sub.2O.sub.3), and calcium oxide (CaO) in addition to silicon dioxide (SiO.sub.2); wherein Silicon dioxide (SiO.sub.2) constitutes 45%-51% by weight of the glass material, boron trioxide (B.sub.2O.sub.3) 25%-35%, magnesium oxide (MgO) 0.01%-2%, aluminum oxide (Al.sub.2O.sub.3) 10%-14.5%, and calcium oxide (CaO) 4%-10%. As the silicon dioxide (SiO.sub.2) content is lower than in the prior art, the glass material has lower viscosity, and hence a lower bubble content, than in the prior art, and this allows products made of the glass material to have a higher yield than products made of the conventional glass.

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.