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Bioplastics are made from plant-based and renewable fibers, such as cornstarch, flax, wheat straw, and bamboo. These materials generally have a lower carbon footprint than petroleum-based plastics and break down more quickly. However, it's important to check the manufacturer's specifications regarding end-of-life composting, as many bioplastics are coated with petroleum-based inputs that may leach harmful chemicals when disposed of improperly.
Most bioplastic phone cases are not certified home compostable, but some may be labeled as industrially compostable. When disposing of such items, it's crucial to remove any non-biodegradable components, such as bumpers and linings.