The protection of medication in blister packs is essentially determined by the shaped blister pack. Alongside proper sealing with a film lid, the even distribution of wall thickness and barriers to water vapour and, in part, to light, are critical in determining the shelf life of the product to be packaged. Purelay offers enormous benefits here. With a single film specification, all durable products can be packed into blister packs. This reduces the complexity of one of the most important primary packaging means. Both fewer storage tests in the pharmaceutical development as well as considerably reduced stock keeping required for production are a pleasing side effect alongside the other benefits of Purelay.