... insulation,heat preservation, fireproof,sound absorption Fiberglass Needle Mat are of superior heat insulation,heat preservation ... ,fireproof,sound absorption,anti-corrosionCharacteristics of Fiberglass Needle ... construction period, extend the using life. Fiberglass Chemical CompositionWeightSiO2Al2O3CaOMgOB2O3ImpurityR2OFe2O3Other54.1±0.514.6±0.416 ...