What does CPCB certification require?
CPCB requires a compostable plastic to satisfy several criteria under industrial composting conditions: it must disintegrate physically within about 12 weeks, biodegrade into carbon dioxide, water and biomass within six months, and pass ecotoxicity tests so the finished compost supports healthy plant growth. It also limits heavy metals and regulated substances. Only material meeting all criteria can be considered compostable to the standard.
The standard exists so that a compostable claim reflects verified behaviour rather than an assumption. Each requirement addresses a different failure mode a buyer would otherwise have to trust on faith.
Why is disintegration tested separately from biodegradation?
Disintegration and biodegradation are different things. Disintegration is the physical breaking apart of the material so it is no longer visible in the finished compost, checked at around 12 weeks. Biodegradation is the chemical conversion of the polymer into carbon dioxide, water and biomass by microorganisms, measured over up to six months.
A material can fragment without truly biodegrading, which is exactly the problem with oxo-degradable plastics. Testing both separately prevents a product from passing on appearance alone while leaving persistent polymer behind.
What conditions does the test use?
The tests replicate industrial composting, not a home compost heap or a landfill. That means elevated temperatures in the region of 55 to 60 degrees Celsius, controlled moisture, and an active microbial community. These conditions accelerate breakdown in a way that ordinary disposal environments do not.
This is a crucial caveat for buyers. Certification to CPCB confirms performance under industrial composting, so the material needs to reach that kind of facility to behave as certified. It does not promise breakdown in a landfill or in open litter.
What does the ecotoxicity requirement protect against?
Ecotoxicity testing checks that the compost produced from the material is safe for plants and soil. A plastic could technically disintegrate and biodegrade yet leave behind residues that inhibit germination or plant growth. The standard guards against that by requiring plant growth tests and limits on heavy metals.
For anyone using the resulting compost in agriculture or landscaping, this is what makes certified compostable material trustworthy rather than merely disappearing from view.
How can a buyer verify a certification claim?
Ask for the certificate and the underlying test reports, and check which standard and which testing body they reference. In India, accredited testing from a body such as CIPET adds confidence that the results are credible. Be wary of a compostable logo with no referenced standard or report behind it.
Anjaneya Bio Products manufactures compostable granules, films and bags built to CPCB criteria, and we treat documentation as part of the product. If a supplier cannot show the test basis for a claim, that is a signal to look more closely.
Key takeaway
CPCB certifies that a plastic disintegrates within about 12 weeks, fully biodegrades within six months under industrial composting at roughly 55 to 60 degrees Celsius, and passes ecotoxicity tests. Ask for the certificate and test reports to verify any claim.