Barrier plastics are polymers that have a pronounced barrier effect, i. e. they allow only minimum permeation of oxygen, carbon dioxide and odors, in particular. They play an increasingly important role especially in the food packaging sector. Two plastics with a particularly efficient barrier effect, polyvinylidene chloride (PVDC) and ethylene-vinyl alcohol copolymer (EVOH), are presented in ... [Show full abstract] this contribution. A description of how they can be processed into composite packaging materials is given. Their properties and applications are also detailed.