PET oxo-biodegradation

Dear Sammysam, I agree in part with the comments of Alexis Stassinopoulos. There is lttle evidence of successful oxidative induced degradation of PET. The oxo-biotechnology has many papers and test documents that verify biodegradation of polyethylene and polypropylene. These are simple hydrocarbons and work well for oxo' technology applications. Howeve, the complex nature of a polyester like PET is a different kettle of fish. We are working on it -but it is not easy. Where I differ with Alex is in regards to definitions of biodegradation. The hydro- degradable industry has successfully lobbied to get the term compostable synonymous with biodegradabilty. This is not the case, in fact items such as leaves and wood and paper ( considered biodegradable) could not comply with ASTM 6400. The test method in 6400 is designed for industrial composting -nothing else. The consequeces of marine or field pollution are not addressed. Virtually all 6400 compliant polymers will not degrade outside of a highly active compost environment. Oxo-biodegradable materials- albeit much slower- will biodegrade anywhere oxygen is present. Surely it is better to share the inevitable carbon conversion between atmosphere and micro-organisms in the bio-background. Carbon14 labelling tests have verified this process. Converting to 90% CO2 is the equivalent of burning in my view and should not be regarded as recovery - and hence recycling. When, and if, we succeed in developing a viable ( realsitic time frame) biodegradable PET - rest assured we will let you know. regards Michael

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