A compostable product is any product specifically manufactured to break down in a compost system at the end of its useful life. A compostable product may be made from plastic, paper, or plant fibers, along with other ingredients that provide necessary form and functionality. The USCC (United States Composting Council) supports the use of compostable products to the extent that they assist in the efficient collection of food and other organics that can be composted, and, by replacing conventional plastics, reduce physical contamination in finished compost products. Compostable products include items such as bags, take-out containers, coffee pods, food packaging, cups, plates and serviceware.
The USCC defines the word compostable (adj.) as: capable of undergoing aerobic biological decomposition in a compost system, such that the material becomes visually indistinguishable and breaks down into carbon dioxide, water, inorganic compounds, and biomass.
For more information: https://www.compostingcouncil.org/page/CompostableProducts