1, the difference of components: the main component of PP is polypropylene. Among all plastics, the density of polypropylene is about 0.90. Polypropylene is usually used to produce building products, such as pipes and sanitary wares. The main component of PE is polyethylene. Polyethylene plastic is mainly used for water supply and drainage pipes and sanitary ware in buildings.

2. Characteristic difference: PP bag is transparent in color, excellent in quality and good in toughness. Because of its hard and brittle material, it is only suitable for packaging but not for bearing. Using color printing and offset printing technology, the colors are bright, mostly woven bags. In addition, PP bag is stretched polypropylene plastic, which belongs to a kind of thermoplastic plastic. It is non-toxic, tasteless and has a smooth and transparent surface. Widely used in cosmetics, food, toys, clothing, stationery, electronics, hardware products and other industries packaging. PE is an internationally recognized contact food material. Non-toxic, tasteless, odorless, feels like wax, and meets the hygienic standard of food packaging. Polyethylene film, light and transparent, moisture-proof, oxygen-resistant, acid-resistant, alkali-resistant, air-tight, good ductility, not easy to damage, excellent heat sealing and other properties. Known as the "flower of plastic", it is the most important material for plastic packaging and printing.

3. Difference of application scope: Polyethylene can be processed by blow molding, extrusion, injection molding and other methods, and is widely used to manufacture films, hollow products, fibers and daily necessities. Polypropylene can be used to make greenhouses, plastic films, culture bottles, farm tools, fishing nets, food turnover boxes, food bags, beverage packaging bottles and so on.