... of superior heat insulation,heat preservation, fireproof,sound absorption Fiberglass Needle Mat are of superior heat insulation,heat preservation,fireproof,sound absorption ... -protection project, would shorten the construction period, extend the using life. Fiberglass Chemical CompositionWeightSiO2Al2O3CaOMgOB2O3ImpurityR2OFe2O3Other54.1±0.514.6±0.416.6±0 ...