mineral fiber board is class A fireproof material.high PH fireproof acoustical. specification:600*600*(6-22)mm. Mineral Fiber Ceiling Board: specification:600*600 ... according to EN20140-1994)Installation: with T-barApplication: used widely in hotel, restaurant, gymnasiums, office building, shopping mall, computer ... , Ukraine, Australia, Korea, Singapore, India, Hongkong, Taiwan etc mineral fiber board