There are some products on the market that claim to be photodegradable and thermo-oxidatively degradable. What is the difference between them and biodegradable plastics?

Photodegradable and thermo-oxygen-degradable plastics are additive degradable plastics, that is, adding degradation additives to traditional PP and PE to achieve so-called "degradation". Microplastics are not only not conducive to the recycling and cleaning of plastics, but also cause greater harm to the environment.

Biodegradable plastics are plastics that can be completely decomposed into carbon dioxide or methane, water and other biomass under certain conditions without affecting the environment.

Are starch-based plastic products biodegradable?

Starch-based plastics can be divided into two categories: one is the plastic made by blending starch and non-degradable resin (PP/PE/PS, etc.); the other is the blend of starch and degradable resin (PLA/PBAT, etc.) made of plastic.

Only the latter of these are biodegradable plastics. We can usually judge whether a product is biodegradable plastic by the "material" on the product label. For example: the material in the picture is marked as polypropylene (PP) and edible starch, which are not biodegradable plastics.

How do consumers choose biodegradable plastic products correctly?

Look at the material. Common materials are PLA, PBAT, PBS, etc.

Look at the implementation standards of the product. The corresponding standards for common biodegradable plastic products include GB/T 20197-2006 "Definition, Classification, Labeling and Degradation Performance Requirements of Degradable Plastics", GB/T 38082-2019 "Biodegradable Plastic Shopping Bags", GB/T35795-2017 "Fully Biodegradable Agricultural Ground Covering Film", GB/T 18006.3-2020 "General Technical Requirements for Disposable Degradable Tableware", GB/T 28018-2011 "Biodegradable Plastic Garbage Bags", etc.

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