1).Aluminum Honeycomb Core 2).Aluminum alloy: 3003 or 5052 3).Foil thickness: 0.036 to 0.1mm 4).Cell diameter: 1.73 to 25.99mm 5).Features: Lightweight High strength Water-resistant Fire-retardant Noise absorption Excellent flatness High shock-proof strength Corrosion-resistant Aluminum honeycomb core is sold in 3 forms: block, unexpanded slices and expanded slices