Pira project on migration of monomers and overall migration

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Abstract
The background and objectives of the Pira Migration Project are described, together with work that has been carried out on the overall migration test procedures and plastics monomers. The initial efforts on the overall migration test procedures have been mainly with the olive oil food simulant, and the total immersion technique. Evaluation of the draft procedure produced has been undertaken by means of a ‘round robin’ collaborative, assessment in conjunction with the Ministry of Agriculture, Fisheries and Food. Initial exploratory work has been carried out to develop olive oil overall migration test procedures for plastics which give unreliable results with the standard procedure. For single side migration testing, a new cell has been designed and the construction is described. Analytical test methods developed for the determination of a number of plastics monomers as residues in the plastic, and in the four standard food simulants, are reported, together with results obtained from migration tests with commercial plastics.