Abstract: Mineral wool capable of dissolving in a physiological medium, and which comprises fibers whose constituents are mentioned below in the following percentages by weight: SiO2 35-60%,? preferably 39-55%? Al2O3 12-27%,? ? 16-25%? CaO 0-35%, ? 3-25% MgO 0-30%, ? 0-15% Na2O 0-17%, ? 6-12% K2O 0-17%, ? 3-12% R2O (Na2O + K2O) 10-17%,? ? 12-17%? P2O5 0-5%,? ? 0-2%? Fe2O3 0-20%, B2O3 0-8%,? ? 0-4%? TiO2 0-3%,? and also comprises a phosphorus compound, the phosphorus content of which, expressed in P2O5 form, varies from 0.2%, especially from more than 0.5%, to 5%, especially to less than 2%, of the total mass of fibers, which is capable of reacting above 100° C. with the fibers to form a coating on the surface of the fibers.

Abstract: Mineral wool capable of dissolving in a physiological medium, and which comprises fibers whose constituents are mentioned below in the following percentages by weight: 1 SiO2 35-60%,  preferably 39-55%  Al2O3 12-27%,  ″ 16-25%  CaO 0-35%, ″ 3-25% MgO 0-30%, ″ 0-15% Na2O 0-17%, ″ 6-12% K2O 0-17%, ″ 3-12% R2O (Na2O + K2O) 10-17%,  ″ 12-17%  P2O5 0-5%,  ″ 0-2%  Fe2O3 0-20%, B2O3 0-8%,  ″ 0-4%  TiO2 0-3%, 

Abstract: Mineral wool capable of dissolving in a physiological medium, which mineral wool comprises the constituents below in the following percentages by weight: SiO2 39-55%, preferably 40-52% Al2O3 16-27%, ″ 16-25% CaO  3-35%, ″ 10-25% MgO  0-15%, ″  0-10% Na2O  0-15%, ″  6-12% K2O  0-15%, ″  3-12% R2O (Na2O + K2O) 10-17%, ″ 12-17% P2O5 0-3%, ″ 0-2% Fe2O3  0-15%, B2O3 0-8%, ″ 0-4% TiO2 0-3%, and in that MgO is between 0 and 5%, especially between 0 and 2%, when R2O≦13.0%.

Abstract: A method for producing mineral wool of a material which is highly fluid at an elevated liquidus temperature in particular above 1,200.degree. C., with a viscosity of less than 5,000 poises at liquidus temperature, is proposed wherein the molten mineral material, after having destroyed all nuclei of crystallization, is supplied into a spinner (1') the peripheral wall (19) of which comprises a multiplicity of orifices with small diameters wherethrough said molten material is centrifuged to form filaments which, in a given case, are subjected to a supplementary attenuating effect of a preferably hot gas flow flowing along said peripheral wall (19) of said spinner (1') and generated by a concentric annular external burner (13). If fiberization of such a material is effected in the traditional way, a great proportion of unfiberized particles in the product will result.