They are not biodegradable, only industrial compostable. Also, since PLA is an acid, it will raise the acidity of its surroundings as it composts. In the wild, it takes at least 80 years for PLA to decompose. To decompose, it needs specific conditions introduced: Oxygen, a Temperature of 140+ degrees, and a 2/3 Cocktail of an organic substrate.
Pura Vida Bioplastics = Real Certificates USDA BIO-BASED, TUV, BNQ, GREEN AMERICA Home Compostable – Breaks down 3-4 months without Chemicals
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