Published 2026-06-24 · Updated 2026-06-29 · Demeto Technical Team
Begin with feedstock variability
Colorants, additives, adhesives, multilayer components and non-PET contamination determine the impurity challenge before reaction conditions are considered.
Design purification around the impurity map
Crystallization, washing, filtration, distillation and polishing steps should address the actual volatile, insoluble, colored and metal-containing species.
Measure the relevant quality dimensions
Use purity together with color, acid value, moisture, ash, metals and targeted organic impurities. Traceability and recycled-content evidence may also be required.
Close the loop with repolymerization
Polymerization behavior, color build, molecular-weight development and final material properties reveal whether purification was sufficient.
Stabilize the commercial process
Define feedstock controls, operating windows, batch release criteria and corrective actions before scaling recurring output.