Time of protection equivalence principle to allow design barrier layers for promoting the use of recycled materials for food contact

European and national environmental protection policies have programmed the forthcoming end of single-use plastics, including food packaging. Because plastic materials account for 50% waste, closed-loop recycling seems imperative. Still, plastics other than PET (Polyethylene terephthalate) are not widely recycled contact due to safety concerns. Among them, postconsumer polyolefins heavily formulated, degraded, contaminated by previously contacting product. Using behind a functional barrier (FB) could resolve issue under specific provisions, but neither regulation nor US FDA offer guidance concerning barriers evaluation use. Mathematical modeling is only viable method recognized American agencies evaluate material usage conditions. This study numerically explores possibility combining two effects: decontamination allow safe use material.