(57) [Abstract] The present invention relates to a mineral wool capable of degrading biodegradable medium comprising the following components by weight%: SiO 2 38-52%, Al 2 O 3 17-23%, SiO 2 + Al 2 O 3 56-75%, preferably 62-72%, RO (CaO + MgO) is 9-26%, preferably 12-25%, MgO4-20%, MgO / CaO ≧ 0.8, ≧ 1.0, preferably or ≧ 1.15, R 2 O (Na 2 O + K 2 O) ≧ 2%, P 2 O 5 0-5%, Fe 2 O 3 (Zentetsu-ryou) ≧ 1.7%, preferably ≧ 2%, and B 2 O 3 0-5%, MnO0-4%, TiO 2 0-3%.本発明は、下記重量%の成分を含む生分解性媒体中で分解し得るミネラルウールに関する:SiO238-52%、Al2O317-23%、SiO2+Al2O356-75%、好ましくは62-72%、RO(CaO+MgO)は9-26%、好ましくは12-25%、MgO4-20%、MgO/CaO≧0.8、好ましくは≧1.0または≧1.15、R2O(Na2O+K2O) ≧2%、P2O50-5%、Fe2O3(全鉄量)≧1.7%、好ましくは≧2%、B2O30-5%、MnO0-4%、及びTiO20-3%。
