Meaning
Chemical substances that function both as direct food ingredients and as plastic packaging additives are subject to overlapping safety assessments. Under food contact regulations, dual use food additives require careful tracking because their presence in the polymer can affect the calculated dietary intake limits. They include common lubricants, slip agents, and acid scavengers that are also permitted directly in foodstuffs.
Packaging convertors must monitor these substances to ensure that migration from the polymer does not push food concentrations past legal thresholds. The rules are limited to materials intended for direct food contact.
Regulatory Interface
Agencies evaluate these substances through two distinct frameworks to ensure public safety. One framework governs the safe ingestion of the additive in food, while the other limits its transfer from the packaging. This double classification requires manufacturers to share detailed usage data across the supply chain.
Clear communication prevents accidental non-compliance.
Migration Control
The physical transfer of additives from the polymer matrix into the food depends on temperature and contact time. Molders manage this migration by optimizing the concentration of the additive during compounding. If the additive concentration is too high, it migrates to the surface and exceeds the permitted migration limit.
Testing with food simulants verifies that the transfer rate remains within safe bounds.
Compliance Challenge
Converters must obtain declarations from resin suppliers to verify additive levels. Since suppliers often protect proprietary formulations, getting this data requires formal agreements. Without these disclosures, the converter cannot certify the finished packaging as food-safe.
This makes supplier relationships essential to regulatory approval.
