1: Thickness of sheet, finished product thickness = material thickness 0.1mm thickness (plastic powder). Finished products generally consist of two parts of materials, the inner panel is relatively thin, and the test panel and door panel are relatively thick. The thickness mentioned by the merchant is the thickness of the door panel.

2: Look at the spot welding technology of the internal structure. If the product is dense and solid, it will be strong.

3: Whether it has been pickled and phosphated. If it has not been pickled and phosphated, the plastic powder cannot be completely integrated into the steel plate during plastic spraying, and the moisture-proof quality is relatively poor.