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This is a tricky question. Maybe becouse of the advertising strategies, different bioplastic suppliers have somewhat different definition. There is two grade of bioplastic in the market, the lower one and the higher one.

The lower grade bioplastic is made of resin mixed with Polypropylene of about 50%, corn starch of about 50% and some other additive. As the polypropylene, this grade of bioplastic cannot be biodegrade completely. The non-organic materials will become small pieces and be harmless. It can’t compost in composting facilities. They are just partly biodegradable.

The higher grade bioplastic is made of corn starch of more than 60% and other non-oil made materials, as PLA, PBS, PHBV. This grade of bioplastic is completely biodegradable and compostable, would compost in composting facilities or home compost bin in the help of the bacteria and micro-organisms, for 3 to 6 months with proper temperature and mosture.

The best way to identify the complete biodegradable and compostable bioplastic is check if meeting ASTM D6400 standards in US and EN 13432 standards in Europe.