Methodological Standard
International standardization protocols establish laboratory test methods to determine the ultimate aerobic biodegradability of plastic and packaging materials under controlled composting conditions. The testing procedure measures the volume of carbon dioxide generated by packaging samples exposed to an active, thermophilic compost inoculum derived from municipal solid waste. Within testing frameworks, iso 14855 provides quantitative data demonstrating the mineralization rate of synthetic polymers, bio-coatings, and paper additives.
The standard applies to multi-layer packaging films, barrier-coated paperboards, and molded fiber formulations. It evaluates chemical biodegradation under optimized laboratory conditions and does not measure physical disintegration sizing, ecotoxicity, or ambient home composting performance.
Testing Procedure
Sample preparation begins by grinding packaging materials into uniform fragments to optimize surface area for microbial colonization. Testing conducted according to iso 14855 places the prepared test material into closed solid-state respirometric reactors alongside mature, aerated compost inoculum with a controlled moisture content of approximately fifty-five percent. Reactors are incubated at a constant temperature of fifty-eight degrees Celsius in darkness to support thermophilic microbial communities.
Pressurized, carbon-dioxide-free air is continuously swept through the compost matrix. Exhaust gas flows through infrared gas analyzers or chemical absorption traps to quantify microbial carbon dioxide evolution. The net carbon dioxide production is compared against the theoretical carbon dioxide yield calculated from total organic carbon content.
A valid test requires that the reference material, such as microcrystalline cellulose, reaches a biodegradation level exceeding seventy percent within forty-five days.
Laboratory Compliance
Development laboratories utilize respirometric data to refine aqueous barrier dispersions and biodegradable extrusion coatings applied to food contact packaging. Sourcing departments demand certified test reports conforming to iso 14855 to substantiate environmental performance claims for novel bio-based packaging lines. Passing respirometric mineralization thresholds forms the compulsory analytical foundation for broader industrial compostability certifications.
Verified laboratory test data provides packaging converters with defensible environmental compliance documentation for retail brand clients.
