PLA (polylactic acid) and its limits
The most common compostable bioplastic, made from fermented corn or cane sugar; suits clear cups and clamshells but only breaks down in industrial composting.
PLA
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Thermoplastic starch (cornstarch blends)
Plant starch plasticised and blended with biodegradable polyesters; the standard material for certified compostable carrier bags, bin liners and mulch film.