Meaning
Formal validation by an accredited third-party agency confirms that a plastic material will break down under specific environmental conditions. Obtaining compostability certification involves subjecting the polymer to rigorous testing for biodegradeability, disintegration, and ecotoxicity. This process ensures that moulded or extruded parts will convert into carbon dioxide, water, and biomass within a set timeframe in an industrial composting facility without leaving toxic residues.
The testing also monitors the concentration of heavy metals to ensure the compost can support plant growth.
Compliance Standard
Regulatory frameworks establish the precise laboratory protocols that materials must pass to achieve commercial approval. To secure a compostability certification, a polymer must meet standards such as ASTM D6400 or EN 13432, which require over ninety percent biodegradation within one hundred and eighty days. These test environments maintain high temperatures and controlled humidity to simulate industrial compost piles.
Degradation Metric
Physical fragmentation measurements complement chemical breakdown testing to evaluate how a part behaves in real-world processing plants. During the evaluation phase for compostability certification, the material must disintegrate so that less than ten percent of the original mass remains on a two-millimeter sieve. This ensures that the finished product does not persist as visible plastic fragments in the soil.
Commercial Value
Market access for disposable consumer products depends heavily on verified environmental claims. Having a valid compostability certification allows manufacturers to print official logos on their packaging, which justifies premium pricing and opens up new distribution channels. Molders must ensure that any colorants or additives used in the resin do not invalidate the primary polymer’s certification.
