The general formula of stretch film is pure polyethylene, polyethylene plus masterbatch, polyethylene plus recycled material, polyethylene plus recycled material, and masterbatch. Different formulas have different properties. The quality of the wrapping film is related to the purity of polyethylene. A good stretch film is completely transparent, uniform in film formation, good in hand, no noise during pulling, relatively uniform retraction stress, and regular increase and decrease, which is in line with the physical properties of polyethylene. performance.

The other is made from recycled material and talc (calcium carbonate). This wrap is completely opaque, the cheapest, and looks like cardboard from a distance. However, this stretch film is very soft and has no stretchability. It will break when pulled, and it is not strong at all.