BigPatents India

A blister (10) for pharmaceutical products, diagnostic reagents or medical implements consists of a blister bottom part (12), which is thermoformed from plastic, of a covering foil (16) made of aluminum or of an aluminum/plastic composite, and consists of an undersealing trough (18), which is sealed against the rear side of the blister bottom part (12) and which is cold-formed from an aluminum/plastic composite film. The aluminum/plastic composite film of the undersealing trough (18) comprises, on the side oriented toward the blister bottom part (12), a peelable heat-sealable layer consisting of a paint having an application weight ranging from 2 to 20 g/m<2>, preferably 7 to 15 g/m<2>, a peelable plastic film having a film thickness ranging from 10 to 40 m, preferably from 15 to 30 m, or a peelable plastic coating having an application weight ranging from 5 to 40 g/m<2>, preferably 7 to 20 g/m<2>. The undersealing trough (18) that can be removed from the blister bottom part (12) by peeling permits the product contained inside the blister (10) to be seen. In order to achieve an optimal storage quality of the product even after the aluminum/plastic composite film of the undersealing trough has been removed, the plastic of the bottom part comprises a barrier with a passage blocking effect against water vapor and/or gases. Figure 1