Two analytical methods are recognised: ASTM D6866 (carbon-14 dating - biogenic carbon atoms contain recent C14, fossil atoms do not) and EN 16785 (European equivalent). Testing takes 3-7 days in a specialist laboratory and costs €200-€500. A reputable supplier attaches the analytical report to the material certificate. Explicitly request this report in the supplier specification. For mass balance certification (route 1), request the corresponding ISCC PLUS or REDcert certificate.
Read the source article: How do you eco-design with bioplastics?