A degradable plastic in which the degradation results from the action of naturally occurring microorganisms such as bacteria ， fungi and algae. Features of the PSM R biodegradable materials ： 1. PSM R biodegradable materials can save a large amount of petroleum resources by applying the natural polymer material as part of the raw materials such as plant starch and cellulose ， which are aboudant and reproducible. 2. There is no waste water effluent gas or waste residue in the course of production;conformity to environmental specifications. 3. PSM R biodegradable materials have good processing performance, which can be processed into all kinds of products with common plastic-processing devices. 4. All kinds of wastes of the PSM R biodegradable materials and products are fully biodegradable and compostable. PSM R biodegradable materials accord with the requirements of EU standard EN13432 and American standard ASTM D6400 ofter being tested by the international anthoritative testing organization. PSM R biodegradable materials obtained EU OK Compost certificate, DIN CERTCO certificate.