the grey quality of Longpai gypsum board is very good. Because Longpai gypsum board is a green building material product recommended by the Ministry of Construction. Each piece of Longpai gypsum board is made of high-quality gypsum, which is healthy and environmentally friendly and will not cause harm to human body. Longpai gypsum board has also won many international and national honorary titles, such as China well-known trademark and China famous brand products. It has been adopted by many well-known units such as Great Wall Hotel.