Pharmacy Aluminium Foil For Strip Packs
Pharmacy aluminium foil for strip packs is a high-barrier packaging material engineered to protect tablets, capsules, lozenges, and similar unit-dose medicines. In a strip pack, two foil webs are heat-sealed together around each product cavity, creating a compact package with excellent resistance to moisture, oxygen, light, odor transfer, and external contamination.
This foil is commonly produced from 8011 or 8079 aluminum alloy and supplied in a hard temper suitable for stable web handling, sharp embossing, clean cutting, and dependable heat sealing. With the correct heat-seal lacquer, printing system, and conversion control, it provides a secure pharmaceutical package that is easy for patients to open while helping preserve medicine quality through distribution and storage.
Product Characteristics
Pharmaceutical strip pack foil is designed for more than visual appearance. Its performance depends on a balanced combination of alloy purity, thickness consistency, surface cleanliness, pinhole control, coating adhesion, and roll quality. These factors directly affect sealing stability on high-speed packaging lines.
| Property | Performance Contribution | Customer Benefit |
|---|---|---|
| High barrier structure | Blocks moisture, oxygen, light, and odors | Supports longer product stability and shelf life |
| Heat-seal coating compatibility | Bonds foil-to-foil under controlled temperature and pressure | Creates secure individual medicine pockets |
| Consistent gauge | Maintains stable sealing and forming behavior | Reduces packaging-line variation |
| Clean, oil-controlled surface | Supports lacquer coating and ink adhesion | Improves print quality and seal reliability |
| Controlled pinhole level | Minimizes possible leakage paths | Protects sensitive pharmaceutical products |
| Good dead-fold property | Retains folded shape after packaging | Helps create tight, compact strip packs |
| High opacity | Prevents light transmission | Suitable for light-sensitive formulations |
Unlike plastic-based blister structures, aluminum strip packs offer a nearly complete barrier when properly sealed. This makes them particularly suitable for products that are vulnerable to humidity or oxidation, including hygroscopic tablets, herbal extracts, probiotics, certain antibiotics, and moisture-sensitive nutritional supplements.
Typical Technical Specifications
Specifications can be adjusted according to packaging-machine design, sealing lacquer system, pharmaceutical product sensitivity, and customer roll requirements.
| Item | Typical Range or Requirement |
|---|---|
| Base alloy | 8011, 8079 |
| Temper | H18, H19, or customer-specified hard temper |
| Foil thickness | 0.020 mm to 0.040 mm |
| Common thicknesses | 0.025 mm, 0.030 mm, 0.035 mm |
| Foil width | 60 mm to 1,250 mm |
| Coil inner diameter | 76 mm or 152 mm |
| Coil outer diameter | According to customer handling equipment |
| Surface finish | Bright or matte, mill finish, coating-ready |
| Coating option | Heat-seal lacquer, primer, printing base coat |
| Printing | One-side or two-side pharmaceutical printing |
| Pinhole control | Inspected according to agreed foil thickness and quality standard |
| Edge condition | Smooth slit edges, burr-controlled |
| Joint requirement | Normally joint-free or controlled as agreed |
| Packaging | Moisture-resistant wrapping, protective end boards, palletized coils |
For applications requiring a robust aluminum base stock, 8011 Aluminum Strip provides an established material platform with good strength, rolling performance, and packaging suitability.
Chemical Composition
8011 aluminum alloy is frequently selected for pharmaceutical foil because its iron and silicon content supports suitable strength after rolling while maintaining the thin-gauge processing capability required for foil production.
| Element | 8011 Alloy, % | 8079 Alloy, % |
|---|---|---|
| Silicon, Si | 0.50 - 0.90 | 0.05 - 0.30 |
| Iron, Fe | 0.60 - 1.00 | 0.70 - 1.30 |
| Copper, Cu | ≤ 0.10 | ≤ 0.05 |
| Manganese, Mn | ≤ 0.20 | ≤ 0.30 |
| Magnesium, Mg | ≤ 0.05 | ≤ 0.05 |
| Zinc, Zn | ≤ 0.10 | ≤ 0.10 |
| Titanium, Ti | ≤ 0.08 | ≤ 0.08 |
| Other elements, each | ≤ 0.05 | ≤ 0.05 |
| Aluminum, Al | Balance | Balance |
Actual chemistry should conform to the applicable material standard, approved mill certificate, and the agreed purchasing specification. For medicine-contact packaging, alloy selection alone is not sufficient; coating selection, migration testing, surface treatment, and final packaging validation are equally important.
Mechanical and Physical Performance
Hard-temper foil is generally preferred for strip packing because it travels smoothly through unwinding, printing, coating, sealing, and die-cutting equipment. The foil must resist stretching during machine operation while still providing sufficient flexibility for folded pack geometry.
| Performance Item | Typical Value or Condition |
|---|---|
| Tensile strength, H18 temper | Approximately 150 - 190 MPa |
| Elongation | Typically ≥ 1%, depending on gauge and test method |
| Density | Approximately 2.70 g/cm³ |
| Melting range | Approximately 655 - 660°C |
| Water vapor barrier | Essentially impermeable when foil and seals are intact |
| Oxygen barrier | Essentially impermeable when foil and seals are intact |
| Light barrier | 100% opaque |
| Heat conductivity | High, supporting rapid thermal response during sealing |
| Dead-fold behavior | Excellent for folded strip-pack constructions |
The heat-seal layer is selected to match the packaging machine's dwell time, jaw temperature, pressure, and line speed. A well-matched coating produces strong foil-to-foil bonds without excessive lacquer transfer, channel leaks, or sealing wrinkles.
Applications in Pharmaceutical Packaging
Pharmacy aluminium foil for strip packs is suitable for solid oral dosage forms and selected healthcare products that require individual protection. Each dose can be separated by tear lines, allowing convenient dispensing while keeping unopened units protected.
| Application | Packaging Purpose |
|---|---|
| Tablets | Protects against humidity, light, and handling contamination |
| Hard capsules | Maintains capsule integrity during storage and transport |
| Soft lozenges | Provides sealed individual portions with good aroma retention |
| Effervescent or hygroscopic products | Helps reduce moisture exposure when paired with validated sealing |
| Nutraceuticals | Supports premium unit-dose presentation and product protection |
| Herbal medicines | Limits odor migration and protects active botanical ingredients |
| Veterinary tablets | Provides durable, clearly printed dose packs |
For converters managing different foil widths or custom slitting programs, Alloy Aluminum Strip options can support broader material planning across packaging and industrial applications.
Benefits for Pharmaceutical Brands and Converters
Strip pack foil offers a practical balance between medicine protection, production efficiency, and patient convenience. Its high opacity allows manufacturers to package light-sensitive products without relying on secondary light barriers. The metallic surface also provides an excellent substrate for batch codes, expiry dates, branding, dosage instructions, and anti-counterfeit print features.
The material supports high-speed conversion when supplied with stable flatness, controlled coil tension, clean edges, and uniform surface quality. Consistent foil performance helps reduce web breaks, seal defects, registration issues, and unnecessary scrap during packaging.
From the patient perspective, strip packs are compact, portable, and hygienic. Individual dosing helps prevent accidental exposure of the remaining medicine after one unit is removed. This format is especially valuable for travel packs, hospital dispensing, sample packs, and products requiring clear dose-by-dose identification.
Quality Control Considerations
Reliable pharmacy foil should be assessed through incoming material inspection and conversion-stage verification. Important checks include thickness measurement, width tolerance, surface cleanliness, coating weight, print adhesion, seal strength, pinhole inspection, roll winding quality, and edge burr condition.
| Inspection Area | Typical Control Focus |
|---|---|
| Gauge measurement | Uniform foil thickness across width and length |
| Surface inspection | No oil stains, scratches, corrosion, dents, or visible defects |
| Coating inspection | Even lacquer coverage and strong adhesion |
| Seal testing | Sufficient bond strength with no channels or peel failures |
| Roll quality | Even winding, stable tension, protected coil edges |
| Printability | Clear graphics, readable coding, good ink anchorage |
| Documentation | Traceability, certificate of analysis, and agreed compliance records |
Pharmacy aluminium foil for strip packs delivers dependable barrier protection in a compact, efficient format. When alloy, temper, coating, printing, and sealing parameters are matched to the medicine and packaging line, it becomes a highly effective solution for preserving product quality from production through patient use.
