prov:value
| - For both films and rigid packaging (bottles), typically the exterior layer, and innermost layer contacting the contents, are composed, for example, of polyesters such as PET or PEN [poly(ethylene naphthalate)], polypropylene, or polyethylene such as HDPE. The middle layers, often called ???barrier??? or ???adhesive??? or ???tie??? layers, are composed of one or more combinations of either PET, PEN
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