Meaning
Technical protocol used to prove that a specific material layer prevents the migration of contaminants into food. Functional barrier validation confirms that a recycled or contaminated layer is sufficiently shielded by a virgin or barrier layer. The validation is complete when experimental data shows that the concentration of substances reaching the food stays below the legal threshold.
Migration Barrier
Performance of the middle layer determines whether the package can safely incorporate recycled content. Functional barrier validation tests the ability of materials like ethylene vinyl alcohol or specific nylon grades to block small molecules. If the barrier is too thin or has pinholes, the contaminants will pass through to the food contact surface.
Testing Sequence
Procedure for the validation involves spiking the contaminated layer with known surrogates and storing the package under accelerated conditions. Functional barrier validation requires measuring the migration at multiple time intervals to establish a diffusion profile. These results are compared to mathematical models to ensure the barrier works for the entire intended shelf life.
Compliance Status
Approval for use in food packaging depends on the successful completion of these rigorous tests. Functional barrier validation provides the evidence needed for regulatory submissions to agencies like the food and drug administration. This step is mandatory for any new multi-layer structure that uses non-food grade materials in the hidden layers.
The protocol ensures that consumer safety is maintained regardless of the source of the raw materials.
