The results of leaching from the studied polymers are summarized in Table . showed that polyurethanes (PU1, PU2, PU3, PU4) all leached Si ranging from 1.7 up to 9.0 μg/g of polymer. They also showed a significant amount of leaching of Zn, especially PU4 which had Zn leached at 50.6 μg/g of polymer. PU3 had a significant amount of Na leached at 9.5 μg/g of polymer. All polyurethanes leached small amounts of Fe ranging from 0.1 up to 1.4 μg/g of polymer.