1235 aluminum foil is one of the alloys with higher aluminum content in the 1000 series, and usually contains a small amount of alloying elements to improve its performance. The use of medicinal packaging materials requires good physical properties such as tensile strength, elongation, breaking strength and tear strength. 1235 aluminum foil has excellent barrier properties and can effectively isolate the entry of oxygen, water vapor and other harmful substances, thereby protecting the quality and stability of medicines. Therefore, aluminum foil 1235 is an alloy foil that is more used in medicinal packaging materials besides the 8000 series (8011, 8021, 8079).

1235 aluminum foil has excellent barrier properties, flexibility and formability for pharmaceutical packaging.

Product specifications of medicinal 1235 aluminum foil

**Alloy and temper**

Alloy: 1235
State: O (annealed), H18 (full hard) or as specified by the customer. The O state is more common in pharmaceutical packaging due to its excellent formability.

**Chemical Composition**

(Al): 99.35% minimum
Si + Fe: 0.65% maximum
Cu: 0.05% maximum
Mn: 0.05% maximum
Mg: 0.05% maximum
Zn: 0.10% maximum
T: 0.06% maximum
Other (each): 0.03% maximum
Other (total): 0.10% maximum

**Thickness**

Typically between 0.006mm and 0.02mm, depending on the specific requirements of the pharmaceutical packaging.

**Width**

Common widths for 1235 pharmaceutical foil range from 200mm to 1,600mm, but custom widths can be manufactured upon specific request.

**Mechanical properties**

– **Tensile strength**:
– O state: 50 – 100 MPa
– H18 state: 135 – 165 MPa
– **Elongation**:
– O state: ≥ 1%
– H18 state: 0.5% – 1%
– **Pinholes**: The number of pinholes is critical for pharmaceutical applications. The foil is tested under strict quality control to ensure that the pinholes are minimal, usually ≤50 pinholes per square meter for certain thicknesses.

**Surface treatment**

Single side glossy (OSB) or double side glossy (BSB)**: Aluminum foil can be made into single or double side glossy according to customer requirements.

Aluminum foil can be degreased, treated for corrosion protection or laminated with other materials such as PE (polyethylene) to enhance performance.

**Coating**

Pharmaceutical 1235 foil can be coated with varnish, primer or other materials for printing or sealing. Coating can enhance the barrier properties of aluminum foil and its compatibility with other materials in the packaging.

**Barrier Properties**

**Moisture Barrier**: 1235 aluminum foil has excellent moisture barrier properties, making it an ideal choice for protecting pharmaceuticals from moisture, oxygen, and other environmental factors.
– **Light Resistance**: Aluminum foil effectively blocks light, preventing degradation of photosensitive drugs.

 **Applications in Pharmaceutical Packaging**

**Blister Packaging**: Typically used as a lidding material for blister packs, providing a strong barrier against environmental contaminants.
– **Strip Packaging**: Used in strip packs where the foil completely wraps the drug, providing maximum protection.
– **Sachet Packaging**: Used for small sachets of powdered, granular, or liquid drugs, providing a seal.

**Standards and Compliance**
1235 aluminum foil for pharmaceutical packaging is typically manufactured to the following standards:
– **EN 546** (European Standard)
– **ASTM B209** (American Standard)
– **ISO 9001** (Quality Management Standard)

**Customization Requirements**
HWPFP can customize aluminum foil in thickness, width, hardness, and coating to meet specific packaging needs.