How to choose high-quality color steel coils in the market?

Color steel coils are preferred product in various new types of buildings, so they have always been popular among the public. So how to choose high-quality colored steel coils among the numerous ones?
First, check the quality certificate of the color steel plate to see if there are any relevant inspection specifications. Before purchasing, first check the company's reputation and reputation in the market, and even better, conduct on-site inspections of color steel plate manufacturers to see if the company's environmental equipment is legitimate. The quality of color steel products can also be known through price, and anything is worth a penny.
Investigate whether the colored steel coil shows steel, such as its cross-section, whether it is finely crystallized, and whether there are gray, dark, and impurities. Assuming that the section is finely crystallized and of relatively good quality. Investigate the thickness of the substrate and peritoneum. The main thickness of the colored steel coil is the substrate and colored peritoneum or coating. A better colored steel plate substrate is 0.02-0.05 millimeters, and the coating or coating thickness is usually less than 0.15 millimeters. Some manufacturers of color steel coils often manipulate the coating and coating of substrates and color steel plates, reducing the thickness of substrates, increasing the thickness of peritoneum, reducing the production cost of color steel coils, and significantly reducing the lifespan of color steel coils. Strike the colored steel coil with your fingers or a hard object, and the metal sound of the high-quality colored steel coil will be bright and loud. If the raw material of the colored steel coil is not good, the sound produced will be dull, and the metal sound will not be obvious.