Mineral Wool Board Insulation
This information reflects our best understanding of product composition in 2015.
Mineral fibers are manufactured by spinning a molten mixture of rock wool (derived from igneous rocks such as basalt) and slag wool (derived from blast furnace slag from the steel industry) into fine fibers. An atomized binder (commonly urea...
Mineral fibers are manufactured by spinning a molten mixture of rock wool (derived from igneous rocks such as basalt) and slag wool (derived from blast furnace slag from the steel industry) into fine fibers. An atomized binder (commonly urea phenol-formaldehyde) is sprayed onto the fibers before moving to an oven to cure. Flame retardants and antimicrobial additives are not required due to the inherent resistance of mineral wool itself to fungal, mold, and mildew growth, moisture. It has a high insulating value and also acts as a good acoustical barrier. Because of its high heat resistance, it is sometimes used as a passive fire barrier. The boards can be faced with foil or other materials, however this CP describes an unfaced board. Boards can be friction-fitted between studs or mechanically attached, and can be used in various applications within a buiding envelope, as well as basement walls, and floors over unheated spaces.