1.mineral wool fiber 2.years quality guarantee 3.heatly and eco-friendly 4.elegant designs and sizes 1.meterials: mineral cotton ... ,compound fiber2.surface : moistureproof ,dope,mouldproof ,ethylene coating,fireproof reagent3.humidity resistance: >75% ... .founction: fireproofing,sound-absorbing, warm-keeping sound absorbtion mineral wool ceiling board