Isotopic Verification
Quantitative determination of carbon isotopes in polymeric coatings establishes the proportion of renewably sourced materials relative to fossil resources. The assessment of bio-based plastic content relies on radiocarbon dating techniques to distinguish contemporary organic carbon from ancient petroleum carbon. Since modern plants contain a known concentration of carbon fourteen while fossil resources have none, the isotopic ratio directly calculates the renewable fraction.
This analytical method holds for both pure polymers and complex blends to ensure that barrier layers applied to paperboard packaging comply with advertised environmental claims. The test provides a repeatable baseline for regulatory declarations of packaging sustainability.
Material Certification
Certification bodies use standardized laboratory procedures to verify the environmental credentials of plastic alternatives. Calculating the bio-based plastic content allows manufacturers to secure industry certifications for their packaging solutions. High-performance liquid chromatography and mass spectrometry separate the synthetic and natural polymers before isotopic testing.
These data-driven processes provide brand owners with verified percentages of bio-derived carbon in their food cartons.
Barrier Evaluation
Polyethylene coatings derived from sugar cane must exhibit the same barrier performance as their conventional petroleum counterparts. When assessing bio-based plastic content, converters test moisture vapor transmission rates to confirm that the biological origin does not alter material behavior. The polymer must melt evenly during extrusion lamination onto the paperboard substrate.
This thermal stability prevents delamination during subsequent carton folding operations.
