Alkali- and heat-resistant inorganic fiber

摘要

The inorganic fiber of this invention comprising as major constituents -% by weight -SiO2 40-50 -CaO 0-10 -MgO 15-25 -Fe2O3 + FeO 0-10 -Al2O3 5-15 -MnO 2-15 - (provided that the total amount of CaO, Fe2O3, FeO and MnO is about 20% by weight) is excellent in alkali- and heat-resistances and is useful as a replacement of asbestos in asbestos-cement boards. Titanium oxide (TiO2) is contained in natural rocks or slags to be used for the meltable material as an impurity in the amount of about 2% by weight.