What is Medicine Blister Aluminium Foil used for?
Medicine Blister Aluminium Foil is primarily used as a sealing material for pharmaceutical blister packs. It provides an airtight barrier to protect tablets or capsules from moisture, oxygen, and contaminants. The foil's high malleability allows it to be heat-sealed with plastic (PVC/PVDC) to form individual dose compartments. Its light-blocking properties also prevent UV degradation of light-sensitive drugs. Common applications include packaging for antibiotics, vitamins, and over-the-counter medications.
What are the key properties of pharmaceutical-grade aluminium foil?
Pharmaceutical foil typically has a thickness of 20-25 microns with exceptional purity (≥99.5% aluminum). It must meet strict FDA/EMA regulatory standards for heavy metal content and migration limits. The material exhibits high tensile strength (≥80 MPa) to withstand blister-forming processes while remaining ductile enough for precise stamping. An oxide layer naturally forms on its surface, enhancing corrosion resistance. Some foils feature lacquer coatings to improve sealability with specific plastics.
How does aluminium foil compare to other blister pack materials?
Unlike pure plastic blisters, aluminium foil provides superior moisture barrier properties (<0.1 g/m²/day WVTR). It outperforms cold-form foil alternatives in cost-efficiency for high-volume production. Compared to paper-based packaging, it offers 100% light protection and better puncture resistance. However, it requires additional plastic layers for structural support, making recycling more complex than mono-material solutions. Its conductivity also enables induction sealing in automated packaging lines.
What are the environmental challenges with blister aluminium foil?
Recycling is complicated by the laminated structure (plastic+foil) requiring specialized separation processes. Thin foil layers may fragment during disposal, potentially contaminating ecosystems. Production consumes significant energy (~15 kWh/kg aluminum) though modern smelters use hydroelectric power. Some manufacturers now offer eco-friendly versions with reduced foil thickness (down to 18μm) or biodegradable coatings. Lifecycle analyses show foil blisters still outperform glass bottles in carbon footprint for certain drug volumes.
How is quality control performed for medicine blister foils?
Quality tests include pinhole detection (electrolytic methods scanning for defects ≥50μm), seal strength measurement (peel force ≥1N/15mm), and migration testing per USP <661>. Surface roughness is controlled (<0.8μm Ra) to ensure consistent heat sealing. Batch certification includes compositional analysis via XRF spectroscopy. Continuous monitoring during production checks thickness uniformity (±3% tolerance) and tensile properties. Pharmacopoeial standards like EP 3.1.11 specify additional biological reactivity requirements.
