Rockwool acoustic Board / Panel 1)Density:40-150kg/m3 2)Thickness:30-100mm 3)L*W:1.2*0.6 m 4)Fireproof: Inflam Grade A Product IntroductionRockwool board is the most economical insulating material. It is mainly applicable to insulation ,sound absorption and fireproof of power plant, oil deport,metallurgical and chemical industry equipment, such as: boiler, oil tank, heat exchanger, reaction tower ...