... 3. Waterproof 4. Heat insulation 5. Aesthetic appearance Paper Honeycomb Sandwich PanelsSpecification:1. External steel panelThickness: 0.4mm ... , Stainless steel with brushed/mirrored. 2. Insulation materialType: Paper honeycomb, Aperture: 20-35mm 3. PanelWidth (mm): 980 ... powder-coated steel sheets. And insulation materials usually use EPS, XPS, PU, Rock wool, Paper honeycomb, Aluminum honeycomb ...