... 3.soundproof & sound absorbing 4.enviorment friendly 5.artistic MgO decorative ceiling boards are produced on the base of fine magnesium ... buildings, hotels, markets, hospitals, airports, subways, gymnasiums, libraries, museums, theaters, factory buildings and computer laboratories.thickness range: 5mm, 6mm, 8mmdimension range ... M) Silica/asbestos free STC-Rated 53-54 fireproof mgo decorative ceiling