PET/ALU/PE PET outer layer: high mechanical strength, heat resistance, and excellent printability ALU core: complete barrier against oxygen, moisture, light, and odors PE inner layer: good heat-sealability and chemical resistance Ideal for retort pouches, coffee packaging, and pharmaceutical blister backing
BOPP/ALU/PE BOPP outer layer: high clarity, gloss, and stiffness; good moisture barrier ALU middle layer: total light/gas/aroma barrier PE sealing layer: reliable heat-seal performance Suitable for dry food packaging (snacks, biscuits, confectionery) where high barrier and transparency are not simultaneously required (BOPP provides transparency, but ALU blocks light – typically used for opaque barrier packs)