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About Plasticizers for PVC. The plasticizers are organic substances with various characteristics, whose main function is to intercalate the rigid polymer structures of material such as PVC for an easy movement and flexibility, making them more precisely "plastics." The presence of plasticizers in the PVC structure will influence different

2 Test methods for plasticizer migration In general, plasticizer migration from PVC synthetic materials can proceed via three different mechanisms, namely volatilization, exudation or extraction, depending on the environment where the PVC coatings are located.

The migration of DEHP in PVC grain exceeded the maximum regulated level of 5000 μg/kg, whereas the levels were much lower in films. In new PVC bags, DEHP was the only compound detected at 4.31 ± 0.5 μg/L in NaCl 0.9% and 4.29 ± 0.25 μg/L in glucose 5% serums, whereas the levels increased 10 times in three-year shelf-life bags.

The emulsion PVC resin ETINOX 450, from Rio Rodano was employed; it is a standard PVC resin for rotational moulding purposes, with a K value of 67. The ASUA 656-T2, a calcium zinc stabilizer from Industrias Qumicas Asua, was employed as thermal stabilizer.

Natural–based PVC plasticizers increased over the last few years owing to the following advantages: 1. Increase the workability. 2. Low toxicity. 3. Low migration. 4. Good compatibility with PVC. 5. Provided from renewable and biodegradable resources. 6. Increase the polymer chain flexibility. 7. Reduce greenhouse gas emissions.