Introduction Plastic plays an important role in cosmetic packaging materials, and the core components of the pump head, spray, bottle cap and other materials supporting the container are plastic, so there is a close relationship between cosmetics and plastic. Among them, the main plastic materials are PP, PE, ABS, PET, PCR, PMMA, etc. In order to distinguish them, it is necessary to understand their characteristics and differences. PP、PE: PP and PE are environmentally friendly materials, which can be directly in contact with cosmetics and food, and the material is white and translucent. 1 . PP (polypropylene) density is small, the raw material appearance is transparent and light, with chemical resistance, collision resistance. Common cream bottles and hand drawn gaskets are PP materials. 2. PE can be divided into HDPE (high density polyethylene) and LDPE (low density polyethylene). It has perfect chemical resistance, in the field of cosmetic packaging material application, PE mater