Meaning
Standard specification covers solid plastic materials designed to undergo aerobic composting in municipal and industrial facilities. Compliance with astm d6400 requires that candidate polymers demonstrate satisfactory biodegradation rates, physical disintegration and absence of ecotoxicity in the resulting compost. The standard applies strictly to materials managed in commercial composting operations where elevated temperatures and controlled moisture levels are maintained.
Disintegration Criterion
Laboratory testing measures physical breakdown by sieving the compost mixture after incubation. Under astm d6400 guidelines, no more than ten percent of the original dry weight of the test material may remain on a two millimeter sieve after twelve weeks of testing. Rapid physical fragmentation prevents intact plastic pieces from contaminating finished soil amendments.
Heavy Metal Threshold
Quantitative chemical analysis measures concentrations of regulated metals before biological exposure. The specification sets maximum permissible concentrations for heavy metals including lead, cadmium and mercury to ensure environmental safety. Samples failing these chemical limits cannot earn compliance regardless of how fast they disintegrate.
Commercial Compliance
Technical verification allows resin suppliers to validate compostable packaging claims for commercial procurement. Standardized test data supporting astm d6400 compliance provides the technical basis for third party certification marks required by municipal waste authorities. Materials passing this standard yield water, carbon dioxide and biomass without leaving persistent synthetic residues.
