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A: There is a material that is truly biodegradable, called compostable biodegradable materials. the real biodegradable material must be compostable. Those that are degraded by the sun, the sun, and the rain are not really biodegradable materials. By definition, the real degradable material must be a material that is completely converted to carbon dioxide and water within 180 days by microbial action under composting conditions. This 180 days is artificially prescribed. Why do you have to do it for half a year? Because it needs to be processed together with the kitchen waste. It is difficult to handle three hundred days and five hundred days, so people make this rule. In fact, depending on the thickness of the material, the degradation time of compost will be different. If it is a plastic film, it can be completely degraded in 30 or 50 days. If it is made into a relatively thick injection molding product, it may take 180 days or even not enough.