... Light weight 2. High strength 3. Waterproof and heat insulation 4. Fast and convenient install Rock Wool Sandwich PanelSpecification:External steel ... /HDP/PUDF, Stainless steel with brushed/mirrored.Insulation materialType:Rock wool Density: 100-160 kg/cu.mPanelWidth (mm): 980, ... . And insulation materials usually use EPS, XPS, PU, Rock wool, Paper honeycomb, Aluminum honeycomb etc.They are widely used ...