Normative Annex
Normative regulatory annexes specify mandatory chemical composition criteria and maximum hazardous substance thresholds for packaging materials declared recoverable through composting and biodegradation. The document en 13432 annex a defines strict concentration ceilings for heavy metals, fluorine, volatile solids, and other hazardous chemical inputs present in raw substrates, coatings, and processing aids. The annex governs initial chemical composition only, without evaluating biodegradation kinetics or physical disintegration.
Chemical Limitation
Quantitative analysis must prove that total volatile solids exceed fifty percent while restricting dangerous elemental contaminants including lead, cadmium, mercury, chromium, and zinc below defined milligrams per kilogram thresholds. Application of en 13432 annex a prevents toxic concentrations from entering organic recovery streams through mineral pigments, functional fluorochemical barriers, or synthetic adhesive formulations. Fluorine content faces explicit restriction, effectively banning intentional perfluoroalkyl substance treatments on compostable food packaging papers.
Substrates failing these elemental limits cannot proceed to subsequent disintegration or ecotoxicity validation stages regardless of their fiber biodegradability.
Sourcing Requirement
Converters and brand owners must obtain chemical assay certificates for all inks, varnishes, masterbatches, and base papers to verify compliance with the annex. Adherence to en 13432 annex a forms the mandatory chemical baseline for achieving European industrial compostability certification.
