What is Hard Aluminium Foil?
Hard aluminium foil is widely used in blister packaging for pharmaceutical products. It offers excellent barrier properties, protects tablets from moisture & oxygen, and ensures product stability across global supply chains.
Why Hard Alu Foil is Preferred
- Superior barrier against oxygen, moisture & light.
- Excellent formability for blister cavities.
- Stable lacquer bonding ensures reliable sealing.
- Long shelf life for sensitive formulations.
Pinhole Density — The Critical Factor
Foil pinholes are natural due to rolling, but their density determines overall barrier performance. Pharma-grade hard alu foil typically follows:
| Thickness | Max Pinholes |
|---|---|
| 20μ | Max 5 / m² |
| 25μ | Max 3 / m² |
Lacquers Used in Pharma Foil
Common sealing systems include:
- Heat-seal lacquer for PVC/PVDC blisters
- Primer coats for print adhesion
- Protective topcoats ensuring abrasion resistance
Printing & Registration
Pharma foils demand razor-sharp registration; even slight misalignment can impact branding or dosing info. High-precision rotogravure lines ensure consistency across large volumes.
“At Meraki Foils, every pharma-grade roll is inspected, tested, and approved based on global GMP and barrier standards.”
Conclusion
Hard alu foil remains the gold standard for blister packaging. With correct barrier properties, lacquer selection, and precise slitting/printing, it delivers unmatched protection for pharmaceutical products.
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