Most compostable palstics are made of PLA which typically fall into industrial composting for their resilience to high temperatures. The standard for compostability (ASTM D6400) is based on complete biodegradation within 180 days under current composting conditions. These plastics are not hazardous/toxic in production and derived from renewable raw materials like starch (e.g. corn, potato, tapioca, etc.). They will also decompose back into carbon dioxide, water, biomass, etc. when composted. Not including products that say “degradable” or any variation of that word, including “bio-degradable” and “oxo-degradable.”