ASTM D5511 determines the rate and degree of anaerobic biodegradation of plastic materials in high-solids anaerobic conditions. The test samples are exposed to a methanogenic inoculum (methane-evolving microorganisms) obtained from anaerobic digesters working on pretreated waste. The ASTM D5511 test procedure is useful for different types of plastic materials.
Anaerobic Biodegradation of Plastic Materials test by ASTM D5511 is performed by using a concentrated anaerobic inoculum. The test material is exposed to an anaerobic static batch fermentation, and the total carbon in the gas (carbon dioxide and methane) evolved is measured as a function of time. The percentage of biodegradability is achieved by calculating the percentage of sample carbon converted to methane and carbon dioxide).
The test samples can be in the form of pellets, films, powder, articles, or dog bone-shaped samples as specified by ASTM D618 guidelines. The test samples are analyzed for their carbon content as per ASTM D4129 guidelines.
Maximum theoretical gas production
Percent of biodegradation
Standard error of the percentage of biodegradation
95 % confidence limits (CL)