Mineral wool, called rock wool sometimes, is divided into rock wool and slag wool normally. Slag is the main raw material of slag wool. Rock wool is produced mainly using igneous rock, e.g. basalt, dolomite, etc. As a kind of very good heat preserving, heat insulating, cold insulating and sound absorbing material for various industrial equipments, traffic facilities such as pipelines, storage tanks, boilers, heat exchangers, fans, vehicles and vessels, as well as various buildings, mineral wool is widely used in industrial sectors such as national defense, petrochemical, construction, metallurgy, cold storage, traffic, etc, particularly the construction industry. In developed industrial countries, consumption of mineral wool products in the construction sector accounts for more than 80% of their production, and in Japan, even up to 90%. Due to energy-saving requirement from protection to the earth, demand for mineral wool products has been still increasing.