can you compost biodegradable plastic?
No — without a compostable certification, 'biodegradable' plastic is ordinary polymer engineered to fragment, not to feed microbes.
which bins can take it?
- hot pile no
- cold pile no
- worm bin no
- bokashi no
- tumbler no
- curbside no
- curbside: Composters landfill unlabeled 'biodegradable' items as contamination — the word alone earns no acceptance anywhere.
why?
Most products sold as biodegradable plastic are polyethylene or polypropylene with pro-oxidant additives that snap polymer chains under UV and heat. That turns one bottle into thousands of brittle flakes with the same molecular backbone microbes couldn't digest before — smaller, not gone. The distinction that matters is a tested standard: ASTM D6400 materials are shown to be consumed by compost organisms within a set window, while 'biodegradable' alone is a promise with no clock and no referee.
watch out for
- Oxo-degradable additives are banned in the EU and restricted by several US states precisely because fragmentation spreads microplastic.
what to do instead
Trash it, or recycle it only if the item carries a standard resin code your program accepts. When you actually need a compostable version of something, shop by certification mark — BPI or TUV — and confirm your local composter takes that product category before buying a case.
often confused with
- Bioplastics — Bio-based describes what a plastic is made from; biodegradable claims how it ends. Neither word implies the other, and neither equals certified compostable.
quick answers
What's the real difference between biodegradable and compostable?
Compostable is a defined, testable claim: under ASTM D6400 the material must disintegrate within 12 weeks, biodegrade at least 90% within 180 days, and leave compost that passes a plant-toxicity screen. Biodegradable has no required timeframe, conditions, or residue limit — a park bench is biodegradable on a geological calendar.