Before the molding, it is a coil. After molding, there are many models. The most common ones are: 820, 840, 900 and so on. Its composition is: protective film (now obsolete), polyester paint, galvanized layer, steel plate (high quality cold rolled steel coil china and hot rolled coil), the same order on the back. The above analysis does not represent authority! There are many brands of color steel plates, and their advantages and disadvantages are different. The general engineering can be divided into single board and composite board, and the composite board is further divided into rock wool composite board and polyphenyl composite board. The use of veneers is generally used in workshops or awnings; some veneers are also installed with additional rock wool, called "field compounding". The composite plate type wall panel is mostly 950 type, and the top plate type 970 or 960 is mostly. The boards are common with 760, 820, 840, 900, 127 or 960. The 760 and 820 are mounted by brackets, and the other versions are fixed with self-tapping screws. More than 760, 820, 840 are used as the top plate, more than 900 are used for the wallboard, and 127 or 960 is used for the wallboard or the top inner anti-hanging plate decoration. Cheap color corrugated steel sheet in stock attachments are also indispensable in engineering. Ridge tiles, female corners, male corners, door and window pockets, small gutters, expansion joints, etc., are often fixed with rivets and glued.