Toxicological Evaluation Protocols for Chemical Migrants in Post Consumer Resins
Post consumer resin compliance requires analytical screening of migrants paired with toxicological evaluation using threshold of toxicological concern models.
Estimated Daily Intake
Meaning
Dietary exposure models calculate the amount of a chemical substance that a consumer is expected to ingest each day from packaged food. The estimated daily intake combines migration data from food-contact plastics with food consumption factors to quantify human exposure.
Exposure Calculation
Multiplying the concentration of a migrant in a food simulant by the daily ingestion rate of that food category yields this exposure metric. For polymers, the estimated daily intake accounts for the fraction of the diet packaged in the specific plastic material under evaluation.
Safety Threshold
Comparing the calculated exposure value against established toxicological limits determines the safety of the packaging. If the estimated daily intake exceeds the threshold of toxicological concern or the acceptable daily intake, the plastic compounder must reduce the migration level of the substance or alter the packaging design.
Migrant Valuation
Determining the migration level requires running tests with food simulants under defined time and temperature profiles. The estimated daily intake utilizes these measured values to predict long-term exposure from substances like plasticizers, antioxidants, or catalyst residues. When the migration level of an additive is below the detection limit of analytical instruments, conservative default values are applied to prevent underestimating the risk.
This precautionary approach ensures that even minor additives or impurities in the polymer matrix do not present a chronic health hazard to the consumer population.