Glass fibre for the reinforcement of organic and/or inorganic materials, method for production of said glass fibres and corresponding composition

Abstract

Glass reinforcement strand, the composition of which comprises the following constituents, within the limits defined below, expressed as percentages by weight: SiO2 50 to 60%, preferably SiO2 ≧ 52% and/or SiO2 ≦ 57%; Al2O3 10 to 19%, preferably Al2O3 ≧ 13% and/or Al2O3 ≦ 17%; B2O3 16 to 25%; ZrO2 0.5 to 1.5%; Na2O ≦1.5%, preferably Na2O ≦ 0.8%; K2O ≦1.5%, preferably K2O ≦ 0.8%; R2O ≦2%, preferably R2O ≦ 1%; CaO ≦10%; MgO ≦10%; F 0 to 2%; TiO2 0 to 3%; RO 4 to 15%, preferably RO ≧ 6% and/or RO ≦ 10%; and Various ≦3%, where R2O = Na2O + K2O + Li2O, and RO = CaO + MgO. The dielectric properties of such glass compositions are particularly advantageous in the MHz and GHz ranges.

Dependencies are inferred from the claim text.