Simulant Extraction

Migration Testing

Plastic plaques, films or finished moulded containers undergo controlled immersion in standardized test media such as ten percent ethanol, three percent acetic acid or vegetable oil. Testing protocol parameters for simulant extraction replicate worst-case storage and usage conditions, such as ten days at forty degrees Celsius for long-term ambient storage or two hours at one hundred degrees Celsius for hot-fill applications. Polymer swelling induced by aggressive simulants accelerates additive diffusion from the plastic matrix into the liquid phase.

Analytical testing of the resulting extract quantifies total non-volatile residues or specific migrant compounds using chromatography or gravimetric analysis.

Solvation Behavior

Solvent polarity and molecular size govern the penetration rate of simulant liquids into the polymer matrix. Fatty food simulants like ethanol fifty percent or vegetable oil cause matrix plasticization in polyolefins, increasing diffusion coefficients of antioxidant additives. Hydrophilic polymers like polyamide show higher absorption rates for aqueous and acidic simulants.

Analytical Limit

Evaporation steps required to concentrate trace migrants prior to instrumental analysis can cause loss of volatile species. Non-volatile migrants quantify accurately, whereas volatile additive breakdown products escape during sample preparation, requiring direct headspace analysis techniques instead.