When manufacturers think about product contamination, packaging is not always the first thing that comes to mind. Yet the material surrounding a product can sometimes become a source of chemical transfer. Under certain conditions, substances used in plastics, coatings, inks, adhesives or other packaging components can migrate from the packaging into the product.
This is where migration testing becomes important. It helps manufacturers determine whether substances can move from packaging into food, beverages, medicines or other products during their intended use. For manufacturers, this is not simply another quality check. It can directly affect product safety, regulatory compliance and market acceptance.
How Do Packaging Chemicals Migrate Into Products?
Packaging is designed to protect a product, but it is not always chemically inert. Factors such as temperature, storage time, the nature of the product and the composition of the packaging can influence chemical migration.
For example, a packaged food containing fats or oils may interact differently with its packaging than a dry food. Similarly, heat during filling, sterilisation or storage can increase the potential for certain substances to transfer.
The migrating substances may include additives, plasticisers, stabilisers, residual monomers, colourants or other chemical components. Not every substance that migrates is automatically dangerous. The concern is whether the substance migrates at a level that exceeds applicable safety or regulatory limits.
This is why manufacturers cannot rely only on the physical appearance or basic quality of packaging. Migration testing provides analytical evidence about what may transfer under defined conditions.
What Happens When Migration Occurs?
The immediate concern is product contamination. If chemicals migrate from packaging into the contents, they can alter the product’s chemical composition or introduce substances that were never intended to be present.
In food and beverages, migration may affect taste, odour or overall product quality. In pharmaceutical products, interaction between packaging and the medicine can become a more serious quality consideration. Depending on the substance and exposure level, there may also be potential toxicological concerns.
For manufacturers, the problem does not end with the product itself. Excessive migration can create questions around regulatory compliance, packaging specifications and supplier quality.
Regulations therefore establish limits for substances that may migrate from food-contact materials. For example, EU Regulation 10/2011 specifies specific migration limits (SMLs) for certain substances and an overall migration limit for plastic food-contact materials. Testing is generally performed using appropriate food simulants under conditions representing the intended or foreseeable use.
Why Migration Testing Matters for Manufacturers
A packaging material may pass physical inspection and still present a chemical compliance issue. This is one reason migration testing should be considered during packaging qualification rather than only after a problem appears.
For manufacturers, testing can help answer practical questions:
- Is the selected packaging suitable for the intended product?
- Could chemicals transfer under expected storage or temperature conditions?
- Does the packaging comply with applicable migration limits?
- Is a packaging supplier meeting the required specification?
- Could a material change introduce a new migration risk?
Testing can therefore support decisions during product development, packaging selection, supplier qualification and quality control.
It can also help manufacturers reduce the risk of costly corrective action later. If a migration issue is discovered after products have entered the market, the consequences can extend beyond replacing packaging. Depending on the circumstances, manufacturers may face investigations, product withdrawals, recalls and damage to customer confidence.
Overall and Specific Migration Testing
Not all migration testing answers the same question.
Overall Migration Testing
Overall migration testing looks at the total amount of substances released from a packaging material into a food simulant under specified conditions. It provides a broader assessment of the material’s overall migration behaviour.
Specific Migration Testing
Specific migration testing, on the other hand, focuses on particular substances and determines whether their transfer remains within the applicable limit.
The choice of test depends on the packaging material, intended application, product type and regulatory market. EU requirements, for instance, specify different food simulants and testing conditions depending on the food category and intended use.
This makes the test selection itself important. A manufacturer should not simply request a generic migration test without first considering how the packaging will actually be used.
How Manufacturers Can Reduce Migration Risks
Migration risks can be addressed well before the final product reaches the market. Manufacturers should begin by understanding the composition and intended use of the packaging material. Supplier documentation, material specifications and declarations of compliance can provide useful information, but appropriate laboratory testing adds an important layer of verification.
Manufacturers should also consider the product-packaging interaction. Factors such as temperature, contact time, food type and storage conditions can influence the potential for migration.
Most importantly, migration testing should be carried out using appropriate methods and conditions that reflect the intended application. This helps generate meaningful data instead of relying on assumptions about packaging safety.
Choose the Right Testing Partner
Packaging is more than a physical barrier between a product and its surroundings. It can also influence the chemical integrity of what it contains. For manufacturers, understanding this interaction is essential for maintaining product quality and meeting regulatory expectations.
Qualitek Labs provides packaging and migration testing solutions to help manufacturers evaluate packaging materials for their intended applications. With analytical testing capabilities and experience across industry requirements, Qualitek Labs can support manufacturers in identifying migration-related risks and making better-informed packaging decisions.
When packaging is part of your product’s safety equation, testing it should be part of your quality strategy too.
Frequently Asked Questions
1. What is migration testing?
Migration testing determines whether chemical substances from packaging materials can transfer into the product under specified conditions of use, storage, and temperature.
2. Why is migration testing important for manufacturers?
Migration testing helps manufacturers identify potential chemical transfer, verify packaging suitability, meet regulatory requirements and reduce the risk of product quality or compliance issues.
3. What types of packaging require migration testing?
Migration testing may be required for plastics, bottles, containers, films, coatings, adhesives and other materials that come into direct or indirect contact with food, pharmaceuticals or other products.
4. What is the difference between overall and specific migration testing?
Overall migration testing measures the total amount of substances that migrate, while specific migration testing evaluates the transfer of particular substances against established limits.
5. What factors can increase chemical migration from packaging?
Temperature, contact time, storage conditions, packaging composition and the nature of the product can all influence the extent of chemical migration.
6. Can migration testing help manufacturers with regulatory compliance?
Yes. Appropriate migration testing can generate analytical data that helps manufacturers demonstrate compliance with applicable packaging and food-contact material requirements.
7. How often should manufacturers conduct migration testing?
Testing frequency depends on the product, packaging material, intended use, regulatory requirements and changes to materials or suppliers. It should also be reconsidered when significant packaging changes are made.
8. Where can manufacturers get migration testing done?
Manufacturers can work with a qualified testing laboratory such as Qualitek Labs to evaluate packaging materials and assess their suitability for intended applications.