The invention relates to producing continuous organic fibres by stretching it from molten minerals, which can be used for producing heat resistant threads, rovings, cut fibres, fabrics, composite materials and products based thereon. The inventive glass has the following chemical composition in mass%: 15.9-18.10 Al2O3, 0.75-1.2 TiO2, 7.51-9.53 Fe2 O3, 6.41-8.95 CaO, 2.5-6.4 MgO, 1.6-2.72 K2O, 3.3-4.1 Na2O, 0.23-0.5 P2O5, 0.02-0.15 SO3, 0.12-0.21 MnO, 0.05-0.19 BaO, impurities up to 1.0, the rest being SiO2. The inventive method consists in loading a ground composition in a melting furnace, inmelting said composition, in homogenising a melt, in consequently stabilising the melt in the melting furnace feeder, in drawing and oiling fibre and in winding it on a spool.; Prior to loading, the composition is hold in an alkali solution for 15-20 minutes, is washed with flowing water for 20-30 minutes and is dried. After having been washed with flowing water and dried the composition is loaded in the melting furnace.