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Types of blister packaging in pharmaceutical industry

2026-06-03

Choosing blister packaging affects product stability, production efficiency, regulatory confidence, and even how patients interact with the final product.

For pharmaceutical companies, the question often comes down to two options: Alu/PVC blister or Alu/Alu coldform blisters. Both are widely used, both are proven, and both solve different problems.The right choice depends on what your product needs protection from, how your production process is set up, and what kind of experience you want to create for the end user.

Understanding the difference starts with how each blister is built. Alu/PVC blisters combine a thermoformed plastic cavity, usually made from rigid PVC, with an aluminium lidding foil. The clear plastic allows the product to remain visible The cavity itself is formed by heating the PVC and shaping it into the desired form, making this format highly adaptable to different tablet and capsule dimensions.

Alu/Alu blisters, often called coldform blisters, use aluminium foil for both the forming web and the lidding material. Instead of heat, the cavity is created through mechanical forming, stretching the foil into shape. The result is a fully opaque blister pack with significantly stronger barrier protection.

Level of protection

From a packaging perspective, the biggest difference between these formats is protection. Alu/PVC provides effective protection that is more than enough for many products. However For products that are sensitive to moisture, oxygen, or light, Alu/Alu offers the highest level of security. Aluminium foil creates an almost complete barrier against external conditions, helping preserve the stability of formulations that would otherwise degrade more quickly. This is especially important for pharmaceuticals with ingredients that react easily to environmental exposure.

Production requirements

Production requirements is also important to take into consideration. Alu/PVC is generally faster and more cost-efficient to process. Thermoforming is a well-established method that supports high production speeds and flexible cavity design. Material costs are usually lower, and production lines can often achieve greater throughput with less mechanical strain. Coldform Alu/Alu requires a more demanding forming process and typically moves at slower line speeds. The foil laminate itself is more expensive, and cavity design can be less flexible because aluminium behaves differently than plastic during forming. For companies producing large volumes of stable products, that difference can have a measurable impact on manufacturing economics.

Transparency

Visibility is another practical consideration. With Alu/PVC, the product remains visible inside the blister. This can  improve patient confidence and make it easier to identify medications. Alu/Alu removes that visual element completely. The product is protected from light, but it cannot be inspected without opening the package. In these cases, clear printing, and accurate labeling become even more important.

Final thoughts

There is no universal answer between Alu/Alu and Alu/PVC because the right choice depends entirely on the product. If the formulation is highly sensitive and long-term stability is critical, Alu/Alu often provides the confidence needed. If visibility, speed, and production efficiency are the priority, Alu/PVC remains a reliable and widely used solution.

Packaging decisions work best when they are made with a clear understanding of both the material and the product it is meant to protect. A blister pack may look simple from the outside, but the material behind it often determines how well everything inside performs.