Cross-border chemical recycling claims require matrix-validated ICP-MS and LC-MS/MS testing to quantify trace non-volatile contaminants below regulatory limits.
Depolymerized monomer mass balance audits verify physical yields and loss factors because laboratory testing cannot distinguish recycled from virgin monomers.
Isotopic drift limits verify chemical recycling integrity by detecting permil shifts in stable carbon and oxygen ratios, stopping virgin PET dilution.
Chemical recycled content verification requires paired ICP-MS elemental catalyst profiling, Py-GC-MS solvent testing, and ISCC PLUS mass balance certificate links.
Customs compliance requires physical composition testing while brand claims rely on audited mass balance ledgers, forcing buyers to manage separate verification streams.
Analytical verification of depolymerized monomer purity requires chromatographic trace contaminant profiling to substantiate cross-border recycled claims.
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