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.

Provided is a glass composition for glass fiber that suppresses variations in fiber diameter of glass fiber including 45.60 to 59.00% by mass of SiO.sub.2, 10.00 to 16.00% by mass of Al.sub.2O.sub.3, 17.00 to 25.00% by mass of CaO, 0.01 to 9.50% by mass of TiO.sub.2, 0.03 to 7.00% by mass of P.sub.2O.sub.5, 0.00 to 9.50% by mass of ZnO, 0.00 to 2.00% by mass of SO.sub.3, 0.01 to 11.50% by mass in total of ZnO and SO.sub.3, and 0.00 to 2.00% by mass in total of Na.sub.2O, K.sub.2O, and Li.sub.2O, with respect to the total amount. The content SI of SiO.sub.2, the content A of Al.sub.2O.sub.3, the content C of CaO, the content T of TiO.sub.2, the content P of P.sub.2O.sub.5, the content Z of ZnO, and the content SO of SO.sub.3 satisfy the following formula (1):

15.0≤(SI/C).sup.2×(A/T)×{P/(SO+Z)}.sup.1/4≤690.1  (1).

The invention relates to a method for producing a multicomponent fiber, wherein the fiber is formed from a plurality of filaments, where the filaments each have a core and a thermoplastic sheath, and where the sheath is generated during the production of the filaments by in situ polymerization of monomers or oligomers of the thermoplastic on the surface of the core, and also to multicomponent fibers produced accordingly and to organosheets produced therefrom.

Provided is a glass fiber having a low spinning temperature and a low liquidus temperature, and besides, having a large difference between the liquidus temperature and the spinning temperature, and a method of manufacturing the same. The glass fiber of the present invention includes as a glass composition, in terms of mass % on an oxide basis, 50% to 65% of SiO.sub.2, 0% to 3% of Al.sub.2O.sub.3, 0% to 1% of MgO, 0% to less than 0.7% of CaO, 0% to 1% of Li.sub.2O, 10% to 20% of Na.sub.2O, 0% to 2% of K.sub.2O, 6% to 10% of TiO.sub.2, and 15% to 20% of ZrO.sub.2, and has a value for (Na.sub.2O+K.sub.2O)/(MgO+CaO) of 6.0 or more.

A fibrous insulation product having a plurality of randomly oriented glass fibers and a binder composition that holds the glass fibers together is disclosed. The fibrous insulation product has an R-value in the range of 10 to 54 and, after curing, has a density, when uncompressed, in the range of 0.30 pcf to 2.7 pcf. Furthermore, the fibrous insulation product includes glass fibers that, prior to the application of the binder composition, have an average fiber diameter less than 15 HT and a quantity of binder that is in the range of 2% to 10% by weight of the fibrous insulation product. The fibrous insulation product also has an average fiber diameter to density ratio (Fd/D) of less than or equal to 40 and a comfort factor less than or equal to 3.417(Fd/D)+60.

A vaulting pole has seven layers. The first layer is a helical E-glass tape, the second layer is a crosswise helical E-glass tape, the third layer is an UHP-glass body wrap, the fourth layer is an S-glass body wrap, the fifth layer is a carbon fiber body wrap, the sixth layer is an S-glass body wrap, and the seventh layer is an S-glass trapezoidal sail piece.

A fibrous insulation product having a plurality of randomly oriented glass fibers and a binder composition that holds the glass fibers together is disclosed. The fibrous insulation product has an R-value in the range of 10 to 54 and, after curing, has a density, when uncompressed, in the range of 0.30 pcf to 2.7 pcf. Furthermore, the fibrous insulation product includes glass fibers that, prior to the application of the binder composition, have an average fiber diameter in the range of 8 HT to 12 HT and a quantity of binder that is in the range of 2% to 10% by weight of the fibrous insulation product. The fibrous insulation product also has an average fiber diameter to density ratio (Fd/D) of less than or equal to 40 and a comfort factor less than or equal to 3.417(Fd/D)+60.

A fibrous insulation product having a plurality of randomly oriented glass fibers and a binder composition that holds the glass fibers together is disclosed. The fibrous insulation product has an R-value in the range of 10 to 54 and, after curing, has a density, when uncompressed, in the range of 0.30 pcf to 2.7 pcf. Furthermore, the fibrous insulation product includes glass fibers that, prior to the application of the binder composition, have an average fiber diameter of less than 15 HT a quantity of binder that is in the range of 2% to 10% by weight of the fibrous insulation product.

The present disclosure relates to an optical fiber comprising a glass fiber including a core and a clad; a primary resin layer that coats the glass fiber by being in contact with the glass fiber; and a secondary resin layer that coats the primary resin layer, in which the secondary resin layer is formed from a cured product of a resin composition that includes a base resin containing a urethane (meth)acrylate oligomer, a monomer, and a photopolymerization initiator; and inorganic oxide particles, a volume average particle size of the inorganic oxide particles as measured by a small angle X-ray scattering method is 800 nm or less, and a standardized dispersion of the volume average particle size is 60% or less.

The present invention relates to a method of producing a coherent growth substrate product formed of man-made vitreous fibres (MMVF), comprising the steps of (vi) providing MMVF; (vii) providing an uncured binder composition; (viii) providing a superabsorbent polymer; (ix) forming a mixture of the MMVF, the uncured binder composition and the superabsorbent polymer; (x) curing the uncured binder composition in the mixture to form the coherent growth substrate product; wherein the uncured binder composition comprises at least one hydrocolloid.