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The main reason we can’t accept frozen food containers in our program is they are have more types of plastic coatings than the shelf stable and refrigerated cartons. Cartons are coated with a layer of Polyethylene. Frozen food containers can have various types of coatings and because of the variation they can cause problems when trying to separate the fiber (paper) layer from the coating layers. Paper mills can’t separate out these embedded plastic layers from the paper fiber, resulting in problems when they try to pulp the fiber into new paper.