There are many kinds of materials for making plastic turnover boxes, and there are different types of manufacturing methods. The most common method is injection molding, and the materials used are usually PE or PP. The methods for judging the two different materials have common and non-common points.
First, look at the colors
Bright colors are usually made of pure materials, and dark colors are not made of pure materials.
Second, look at flexibility
The PE material usually has a smooth surface and an impact during use, and the box will have no spots and good hardness. Boxes made of PP usually have good toughness, good weather resistance, and good formability.
Third, smell
Good-quality plastic turnover boxes do not have a pungent odor. Low-quality plastic turnover boxes have a pungent odor.