... ) fast and convenient construction Our sandwich panel takes EPS,rock wool or fiberglass as core material and corrugated steel sheets as covers ... .12,15,18, and 20kg/m3.the density of mineral wool is more than 110kg/m3 and the steel cover can ... , exporter of color steel sandwich panels, producing and installingEPS, rock wool, PU sandwich panel, 3million m2/year. ISO9001:2000 certificate.