Aluminium Foil 1235-O on Flexible Packaging Foil
Aluminium Foil 1235-O is a specialized grade of aluminum foil widely used in flexible packaging due to its exceptional combination of flexibility, strength, and barrier properties. Recognized for its durability and excellent resistance to moisture, light, and oxygen, this alloy and temper combination makes it an ideal material for food, pharmaceutical, and industrial packaging applications.
The 1235 alloy belongs to the 1xxx series of aluminum, characterized by its high purity (at least 99.35% aluminum content). The temper "O" denotes that the foil is in the annealed soft state, delivering enhanced flexibility and formability that holds particular value in demanding flexible packaging processes.
Features and Functions
- High purity aluminum base: Ensures non-toxic, corrosion-resistant properties suitable for direct food contact.
- Excellent barrier protection: Minimizes the exchange of gases, moisture, and aroma, effectively preserving product freshness.
- Soft temper (O): Provides outstanding elongation, ease of folding, and wrinkling, facilitating a wide range of packaging designs.
- Heat conductivity: Aids in even heating during thermal processing or cooking.
- Lightweight but robust: Offers strength despite being ultra-thin, reducing material use without compromising packaging integrity.
- Recyclable and environmentally friendly: Supports sustainability through aluminum's recyclability.
Typical Applications in Flexible Packaging
Due to its exceptional technical qualities, Aluminium Foil 1235-O is found in a variety of packaging markets, including:
- Food packaging: Covering products like confectionery, snacks, frozen foods, coffee, and dairy, where moisture and oxygen barrier are critical.
- Pharmaceutical and medical packaging: Protection of sensitive products such as tablets and capsules against environmental exposure.
- Personal care and cosmetics: For pouches, wrapping, and sachets requiring barrier protection plus flexibility.
- Industrial components: Used in laminates with other flexible films for insulation and moisture protection.
Its ability to form strong seals with films such as polyethylene (PE) or polypropylene (PP) expands its utility in multi-layer laminates to impart barrier performance combined with mechanical strength.
Technical Details and Implementation Standards
Aluminium Foil 1235-O must meet international standards including ASTM B479, AMS 4035, and EN 485, ensuring consistent quality and performance suitable for rigorous packaging applications.
Chemical Composition (% by Weight)
| Element | Composition Range |
|---|---|
| Aluminum (Al) | 99.35 (minimum) |
| Iron (Fe) | 0.60 (maximum) |
| Silicon (Si) | 0.30 (maximum) |
| Copper (Cu) | 0.05 (maximum) |
| Manganese (Mn) | 0.05 (maximum) |
| Magnesium (Mg) | 0.03 (maximum) |
| Zinc (Zn) | 0.03 (maximum) |
| Titanium (Ti) | 0.03 (maximum) |
| Others | 0.10 (maximum total) |
Alloy Temper Properties (Temper "O")
| Property | Typical Value | Test Method |
|---|---|---|
| Temper | Fully annealed (Soft) | Visual/Mechanical Means |
| Tensile Strength | 65 – 110 MPa | ASTM E8 |
| Elongation at break | ≥ 20% | ASTM E8 |
| Hardness (Brinell) | 20 – 25 HB | ASTM E10 |
| Density | 2.70 g/cm³ | ASTM B750 |
Technical Specifications
| Parameter | Typical Range | Unit |
|---|---|---|
| Thickness | 5 – 50 | Microns (µm) |
| Width | Up to 2200 | mm |
| Temp range for usage | -40 to +250 | °C |
| Elongation | ≥ 20 | % |
| Surface finish | Bright/Dull | - |
| Microstructure | Fully annealed | - |
| Corrosion resistance | Excellent | - |
| Oxygen transmission rate (OTR) | < 0.1 | cc/m²/day |
| Moisture vapor transmission rate (MVTR) | < 0.005 | g/m²/day |
Processing Characteristics
Aluminium Foil 1235-O is especially favored in flexible packaging due to its balance of pliability and strength. Its soft temper allows it to be easily laminated, formed, folded, and sealed without cracking or breaking. It can be roll-formed and combined with adhesives compatible with polyethylene, polypropylene, and polyester substrates.
As foil thickness reduces, comprehensive quality control ensures consistent pinhole detection and surface uniformity to maintain barrier properties after lamination.
Advantages for Packaging Industry
- Uniform and dependable barrier properties support preservation of wide product types.
- Prevents contamination and oxidation while maintaining flavor and aroma integrity.
- Non-toxic and food-safe, compliant with regulatory food contact directives globally.
- Compatible with numerous multi-layer flexible structures.
- Smooth and polished surface improves printing and laminating quality.
Aluminium Foil 1235-O in its fully annealed temper is an indispensable material in the flexible packaging sector. Its combination of high purity aluminum, excellent flexibility, and robust barrier performance fulfills the demanding needs of food, pharmaceutical, and industrial packaging markets. its chemical composition, technical specifications, and mechanical properties can guide manufacturers and packagers to optimize their products for enhanced shelf life, safety, and consumer appeal.
Choosing 1235-O aluminium foil ensures superior performance paired with cost-efficient processing for innovative and sustainable packaging solutions keeping products fresh, safe, and visually attractive.
For personalized advice or custom foil solutions, please contact your aluminium foil supplier to discuss your specific application needs.
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