Pharmaceutical Packaging. Aluminum Blister Foil. Aluminum foil with printing, primer or lacquer, seal to PVC rigid film, PVC/PVDC, Alu-Alu, for blister package. Alu-Alu (coldform alu) Seal to aluminum blister foil, instead of PVC film, much better barrier performance. PVC/PVDC. PVC rigid film, or laminated fiilm of PVC & PVDC, seal to aluminum blister foil.