Recycled Polyolefin Oligomer Identification for Food Contact Clearance
Clearing recycled polyolefins for food contact demands HPLC-GC-FID and GCxGC-MS identification of oligomeric fractions evaluated against TTC thresholds.
Simulant D2 Extraction
Meaning
Analytical testing measures the migration of plastic additives and monomers into fatty foods using a specific high-boiling solvent or oil. Performs simulant D2 extraction to replicate the worst-case exposure of packaging materials to fatty food products like cheese and butter. This test is necessary to verify that the polymer packaging is safe for fat-contact applications and complies with regulatory standards.
Extraction Mechanism
High chemical solubility drives the migration of hydrophobic additives from the polymer into the fatty food simulant. During simulant D2 extraction, the oil or solvent penetrates the plastic matrix, mobilizing plasticizers and stabilizers. This migration depends on temperature and contact time, with higher temperatures accelerating the diffusion of these additives.
Understanding this behavior helps compounders design formulations that resist leaching when exposed to fatty foods.
Laboratory Procedure
Standardized conditions of temperature and duration are applied to simulate actual storage environments. Analysts expose the polymer sample to the oil simulant at a set temperature for several days, depending on the intended use. After the exposure period, the simulant is recovered and analyzed to determine the mass of migrated compounds.
Because using vegetable oil directly can be analytically difficult, laboratories often use alternative volatile solvents like isooctane for quicker results. This testing confirms that the packaging material is safe for its intended commercial application.
Moulding Relationship
Cooling rates and injection pressure affect the crystallinity of the moulded part. High crystallinity creates a denser structure that restricts the diffusion of additives, lowering the extraction rate. Processors must control the cooling cycle to optimize part density and reduce the risk of migration failures.