Within the aluminium foil for pharmaceutical packaging market, type classification distinguishes between plain foil, coated foil and laminated foil, each addressing specific barrier and processing requirements. Plain foil, typically 6–12 µm thick, is employed where a simple metallic barrier suffices, such as secondary overwraps for blister packs; its low cost and high reflectivity make it a baseline material. Coated foil incorporates polymeric layers—commonly polyethylene, polypropylene or polyester—applied via extrusion or lamination to enhance moisture resistance, heat‑sealability and mechanical strength, thereby supporting primary packaging of sachets and vials. Laminated foil combines metal with multiple polymer layers, often in a tri‑layer structure, to achieve synergistic barrier performance against oxygen, moisture and aroma migration; this type is essential for high‑value biologics and lyophilized products that demand stringent protection. The proportionate adoption of each type aligns with the application mix, with coated and laminated variants capturing the premium share due to their superior functional attributes, while plain foil sustains a modest, cost‑driven niche.