Overview
Pharmaceutical packaging foil is a high-purity aluminum foil specifically engineered for medicine protection. Typically ranging from 20-50 microns in thickness, it serves as a critical barrier component in drug packaging systems. Modern variants often incorporate polymer coatings (e.g., PVC, polyamide) to enable heat sealing and enhance chemical resistance. The material must meet stringent pharmacopeia standards for extractables and leachables to ensure drug safety.
Physical and Chemical Properties
The foil's exceptional barrier properties stem from aluminum's inherent impermeability to gases, vapors, and light. Standard grades exhibit less than 0.1 g/m²/day water vapor transmission rate (WVTR) and near-zero oxygen transmission. Specialized versions may feature: cold-formable alloys for deep-drawn blisters, lacquered surfaces for printability, or laminated structures combining multiple barrier layers. The surface energy is carefully controlled (typically 38-42 dynes/cm) to ensure proper coating adhesion.
Main Applications
Primary use is in blister packaging, where the foil forms the back layer that seals to transparent PVC/PVDC cavities containing individual dosage units. This accounts for approximately 70% of pharmaceutical foil consumption. Other applications include: strip packaging for unit-dose systems, sachets for powders/granules, and lid stock for bottle seals. Emerging uses include RFID-integrated foils for track-and-trace compliance and child-resistant formats.
Safety and Storage
Regulatory compliance is paramount - foils must pass USP <661> and EU 10/2011 migration tests. Food-grade lubricants are used during rolling to prevent contamination. Storage requires protection from humidity (maintain <65% RH) and mechanical damage. Rolls should be stored vertically on padded racks. Shelf life is typically 12 months from production when properly stored.
B2B Procurement Guide
Key specifications to evaluate: thickness tolerance (±5%), tensile strength (80-150 N/mm²), and coating weight (2-6 g/m² for standard heat-seal layers). For regulated markets, insist on full documentation including: material certifications, FDA/EU compliance statements, and batch traceability. Sample testing should verify: seal integrity (peel strength >7 N/15mm), pinhole counts (<5/m²), and absence of delamination.
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