Generally speaking, plastic frame products are made of PP material, that is, polypropylene, which is called C material. There are also some mixed use of PP and PE, and some use recycled materials or add fillers to save costs. It depends on the effect you want to achieve, whether it is one-time use or long-term use, what product is used to install, and whether the product is used It is required to reach food grade and so on to determine the materials used.