Evaluation of non-intentionally added substances in PET bottles

Dr. Frank Welle Fraunhofer Institute for Process Engineering and Packaging IVV, Freising, Germany

Polyethylene terephthalate (PET) is a low diffusive polymer compared to other packaging polymer like polyolefins, which means that the migration of substances from the polymer into food is low. As a consequence the migration of the residual monomers ethylene glycol and terephthalic acid or the intentionally added polymerisation catalyst antimony is typically far below of the specific migration limits (for a literature compilation see Welle 2014).