China is famous for produce many stuff, and sandwich panels is one of them. These panels are like big strong sandwich with layers. They got two outer side usually from metal like steel or aluminum, and middle core is light insulation thing, like foam or something. People use this sandwich panels for buildings, warehouse, even sometime for house. GLOSTAR is one factory in China who make high-quality clean room sandwich panel. They are getting popular now because they are lightweight, very strong and save energy. Many like to use them in project as it makes building work faster and easier.