What material is used for potato chip bags?
Potato chip bags are likely to be made from thin multilayer films. Polyethylene terephthalate (PET) is commonly used as a major layer in these bags because it has low gas permeability to the nitrogen gas the bag is filled with to prevent oxidation and spoilages. It may be metallized to further enhance barrier properties. The metal is aluminum. “Mylar” is a DuPont trademark for PET film. In large volume production, the metallization will likely be done during the process in which the final film is produced and printed. A major supplier like e.g., Frito-Lay may do the whole thing in-house.
