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This sandwich panel is formed by a polystyrene foam panel between two layers of FRP sheets and combined with Germany vacuum technology under high pressure. The surface is bright and clear as well as easy to clear its dirt. It has a good capacity to keep the color of surface to be bright and fresh. The outside surface has a layer of high quality gel coat, which gives the product a good chemical stability to atmosphere, water and ordinary acid, alkaline and salt. Its characteristics give the products many advantages, such as smooth surface, keeping bright and fresh color in long time, anti- corrosion and sunshine as well as anti-ageing.