1. Advantages: good fire-resistant properties 2. Fire rating: A-class 3. Noise-absorbing,heat insulation,easy to install Stainless Steel sandwich panelSandwich is 1 × 304/2b stainless steel plate as surface material, self-extinguishing polystyrene, rock wool, polyurethane, paper honeycomb core material such as with a hot glue curing machine in a continuous heat and pressure combined into the ...