GLASS FIBRE FOR THE REINFORCEMENT OF ORGANIC AND/OR INORGANIC MATERIALS, METHOD FOR PRODUCTION OF SAID GLASS FIBRES AND CORRESPONDING COMPOSITION

摘要

The invention relates to a reinforcing glass fibre of the following composition with the limits given below in weight percentages: 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 %, various =3 %, where R2O = Na20 + K20 + Li20, et RO = CaO + MgO. The dielectric properties of said glass compositions are particularly advantageous in the MHz and GHz ranges.