Meaning
Toxicological threshold of concern used to evaluate the human health risk of low-level chemical substance migration from food contact plastics when specific toxicity data is unavailable. The TTC framework classifies migrating chemicals into groups based on their molecular structure to assign a safe exposure level. It allows regulators to focus on substances that present a higher risk.
Risk Classification
Organic molecules are grouped into Cramer classes depending on their structural features. This TTC approach determines the exposure limit below which no adverse health effects are expected. This method reduces the need for expensive animal testing.
Packaging Compliance
Identifying unknown peaks in migration chromatograms can be very difficult. Using the TTC allows packaging producers to quickly assess whether these trace compounds are present in concentrations that are low enough to be considered safe. This approach simplifies the approval process for new polymer alloys.
Analytical Link
Chemical detection limits must be low enough to measure concentrations that are below the risk threshold. This TTC requirement drives the use of high-sensitivity analytical methods like gas chromatography with mass spectrometry to confirm that any migrating additives do not exceed the safe exposure level, which helps compounders and molders ensure that their products are fully compliant with food-contact regulations even when dealing with complex or recycled resin formulations.
