FEICA recommendation to adhesive suppliers and users on Assessment of PAAs in polyurethane adhesives intended to be used in food packaging.pdf
For many decades, reactive polyurethane adhesives have been used globally to manufacture flexible packaging in a safe and cost-effective way. Applying good manufacturing practice is key to achieving compliance with the demanding migration limits defined by food packaging regulations and preventing contamination of food through the migration of adhesive components which are not fully cured.
Special attention has to be paid to laminates containing aromatic diisocyanate monomers which are not fully cured in the PU adhesive layer. If laminates with insufficient cure time come into contact with food too early, migration of such aromatic diisocyanate monomers through the film separating the adhesive from the food can occur and primary aromatic amines (PAA) will be formed. Therefore, the adhesive user has to be made aware how to test for compliance with the limits for PAA as part of good manufacturing practice.