Purification board, also known as clean board, is a composite board made of color-coated board, stainless steel and other materials as surface material. Because of its unique dust-proof, anti-static and other effects, it is widely used in electronics, pharmaceuticals, food, biology, instrument manufacturing and Scientific research and other purification engineering fields that have strict requirements on indoor environment.

The purification board can use seven core materials: rock wool, glass wool, paper honeycomb, glass magnesium board, color steel plate, aluminum-zinc plate and other covering materials. The purification board uses high-quality substrates, and the requirements for the surface, shape and dimensional accuracy of the substrate are getting higher and higher. For outdoor use, flat hot-dip galvanized steel coils with small spangles and flat hot-dip galvanized steel coils without spangles are emerging. Zinc alloy hot-dip coils; indoor use such as electro-galvanized steel coils, film-coated cold-rolled sheets and aluminum coils. Improving the pretreatment process and pretreatment liquid, reducing the number of equipment and low cost has become the mainstream process, and constantly improving the stability, corrosion resistance and environmental performance of the pretreatment liquid.