... absorbing effect, heat preservation, high fire retardant, high strength level ,beautiful decorative effect, etc. it can improve acoustical environment ... improve timbre. 2. property of fireproofIt is fireproof level A ( non-flammable level) 3. property of heat preservationthe ceiling has good ... felt to compound. So it improves its strength and level greatly. quick and simple propertybecause of light, it ...