the invention relates to containers having a thin layer of polyvinylidene fluoride polymer or copolymer on its inner and / or outer surface . the polyvinylidene fluoride layer acts as a barrier layer in reducing or preventing the migration of chemicals from thermoplastic or thermoset polymeric containers into the contents of the container . this is especially applicable for containers in the food , biotech and pharmaceutical industries , as well as for toxic or corrosive materials .