Finite difference diffusion modeling provides legally accepted migration estimates for polyolefin oligomers when parameterized with conservative barrier coefficients.
Unidentified migrants in food-contact PET above 10 ppb require structural elucidation, Cramer classification, or mutagenicity testing to establish safety.
Cross-border polymer migration compliance requires testing finished articles under verified worst-case simulants, contact times, and surface-to-volume ratios.
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