Polyolefin Non Intentionally Added Substances Identification Basics
Polyolefin non-intentionally added substances require chromatographic screening, Cramer toxicological tiering, and finished article migration verification.
Finished Article Migration Testing
Meaning
Analytical procedures determine the quantity of chemical substances that transfer from a completed plastic part to a food simulant. Finished article migration testing is the final validation step required to ensure that a product is safe for its intended use and complies with international health standards. Unlike resin testing, this process evaluates the part in its final geometry, accounting for any changes that occurred during the moulding or extrusion process.
Simulant Selection
Testing involves exposing the part to various liquids that mimic the behavior of different food groups. Ethanol solutions and vegetable oils are used to represent alcoholic or fatty foods. The duration and temperature of the finished article migration testing are chosen to reflect the most extreme conditions the part might encounter during storage or use.
Surface Dynamic
Results are calculated based on the ratio of the part surface area to the volume of the simulant. Because the geometry of the part influences how much chemical can migrate, the finished article migration testing must be conducted on the actual product rather than a standardized test plaque. Small parts with high surface area to volume ratios often face more stringent scrutiny because they have a higher potential for substance transfer.
Compliance Threshold
Regulatory agencies set specific migration limits for individual additives and overall migration limits for the entire plastic material. If the finished article migration testing reveals levels that exceed these boundaries, the part cannot be legally sold for food contact. The data from these tests also provides a baseline for ongoing quality control, allowing manufacturers to detect shifts in material purity or processing stability.
By maintaining detailed records of these migration values, a company can demonstrate its commitment to safety and defend its products against regulatory challenges or liability claims in the global marketplace.