... 3. Waterproof and heat insulation 4.Fast and convenien Aluminum honeycomb sandwich panelSpecification:External steel panelThickness: 0.4mm ~ 1. ... HDP/PUDF, Stainless steel with brushed/mirrored.Insulation materialType: Aluminum honeycomb, Aperture: 20-35mm PanelWidth (mm): 980, 1180(the ... environment protection, economical, good structure, easy to installation. Aluminum honeycomb sandwich panel