Bio-degradable mineral wool, especially rock wool for thermal and acoustic insulation or soil-less culture substrates, has high alumina and alkali metal oxide contents and can be produced by internal centrifugation

摘要

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%, Al2O3 16-27%, CaO 3-35%, MgO 0-15%, Na2O 0-15%, K2O 0-15%, R2O (Na2O + K2O) 10-17%, P2O5 0-3%, Fe2O3 0-15%, B2O3 0-8%, and TiO2 0-3%; and in that MgO is between 0 and 5%, especially between 0 and 2%, when R2O d" 13.0%.