A thermoformable, three-layer, laminated material having moisture vapor barrier characteristics for use in manufacturing a blister package for pharmaceuticals comprised of: a two-sided core layer of polyvinylidene chloride, a first polymer film attached to a first side of said core layer, and a second polymer film attached to the opposing side of said core layer, wherein said core layer has a thickness of at least 7.62 µm (0.3 mils) but not more than 127 µm (5.0 mils), wherein said first polymer film and said second polymer film are both adhesively attached to said core layer by means of a heat-activated dry bond adhesive. Said first polymer film and said second polymer film may be symmetrical or asymmetrical with regard to each other as to thickness and chemical composition of material used and are both any one selected from the group consisting of PVC, APET, PETG, a rubber modified nitrile polymer, polypropylene or polystyrene. In the preferred embodiment, each of the polymer films is PVC. The disclosed material provides a high moisture barrier, reduced package curl, a stable inter-laminar structure and outer surfaces which lend themselves well to bonding with other materials as well as to printing and coating.
