Completely biodegradable plastics are mainly made from natural polymer materials (such as starch, cellulose, chitin) or agricultural and sideline products through microbial fermentation or synthesis of biodegradable polymers, such as thermoplastic starch plastics, aliphatic polyesters, polymers. Lactic acid, starch, polyvinyl alcohol, etc. belong to this type of plastic.
Under composting conditions, due to the biological reaction process, plastics can be degraded and disintegrated, and finally completely decomposed into carbon dioxide, water, and other new biomass, and the heavy metal content of the final compost, toxicity test, residual small fragments etc. must comply with the relevant international and national standards.
The European standard EN13432 and the American standard ASTM D6400 have been widely adopted as international standards and international certification standards for the complete biodegradability of plastics. According to the EU EN13432 standard, fully biodegradable materials and products are required to meet the following four requirements:
1) After the material or product has passed the three-month composting test, 90% of the plastic must be decomposed into small particles less than 2mm.
2) Within 180 days for a single polymer (90 days for a blend), 90% of the material or article must be degraded and converted to carbon dioxide water.
3) Materials or products must meet the strict limits of heavy metal content stipulated by the state.
4) The quality of the results passing the toxicological test must be absolutely safe for the environment.
Disposable environmental protection plastic film products are widely used in: medical and sanitary films, agricultural mulching films, shopping bags, vest bags, fresh-keeping bags, garbage bags, continuous roll bags, disposable gloves, etc. and various antistatic film products, such as: electronic product packaging bag.
