Meaning
Isotopic partitioning that occurs during physical or chemical processes to alter the ratio of stable carbon isotopes. Analyzing carbon-13 fractionation allows testing laboratories to verify the portion of renewable or bio-based carbon present in a polymer compound. This measurement confirms that the feedstock originated from modern biological cycles rather than fossil reserves.
Isotopic Baseline
Carbon ratios vary depending on the photosynthetic pathway of the source plant used for the polymer feedstock. The resulting isotopic signature in the refined monomer is preserved through polymerization and moulding, offering a permanent fingerprint. This characteristic cannot be altered by thermal processing or recycling.
Material Verification
Sourcing departments rely on isotope testing to validate the premium paid for certified circular or bio-based resin batches. Discrepancies in the isotope ratio reveal the presence of uncertified fossil-derived compounds or unauthorized post-industrial regrind in the supply chain. This tracking mechanism protects against greenwashing claims and secures regulatory compliance by confirming that the material matches the supplier datasheet and sustainability certification documents.
Process Monitoring
Isotopic testing is conducted primarily on incoming resin lots rather than finished parts. While the moulding process itself does not influence isotope ratios, maintaining trace documentation is necessary for chain of custody certifications. These records ensure the integrity of the recycled material claim from raw feedstock to the final moulded part.
