What's the difference between OPP movies and PE movies?

They are all plastic, but the materials are different. PE is polyethylene and OPP is polypropylene.

OPP film is a directionally stretched polypropylene film. Firstly, the melt of polymer polypropylene is made into sheet or thick film, which is stretched in two vertical directions at a certain temperature and a set speed, and then made into a film through special processing.

PE film is a thermoplastic resin film polymerized from ethylene. Polyethylene film is odorless and non-toxic, feels like wax, has excellent low temperature resistance, good chemical stability, resistance to most acid and alkali corrosion, low water absorption and excellent electrical insulation.