FIELD: mineral fibers. SUBSTANCE: invention provides artificially manufactured glasslike fibers having solubility at pH 4.5 equal to at least 20 nM/day and melt viscosity at 1400 C equal to 10-70 Ps. Corresponding composition includes, wt %: SiO2 32-45, Al2O3 16-28, CaO 10-28, MgO 2- 20, FeO 2-15, Na2O+K2O up to 12, TiO2 up to 4, and other elements up to 8. EFFECT: increased manufacture efficiency and ensured biological safety. 14 cl, 1 tbl
