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Why is low-density polyethylene commonly used in packaging film and grocery bags?
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plastic
Plastic soft-drink bottles are commonly made of polyethylene terephthalate (PET).
Low-density polyethylene (LDPE) is widely used in packaging film and grocery bags primarily because of its high flexibility.12
This flexibility is a direct result of the polymer's molecular structure. During the production of LDPE, the process creates both long and short branches along the polymer chains. These branches prevent the molecules from packing closely together into a hard, stiff, or highly crystalline arrangement, which gives the material its characteristic pliable and flexible nature.12