What Is Oxo-Biodegradable Plastic?
Oxo-biodegradable plastic offers a solution to plastic waste that is found in the open environment because it does not just fragment. It biodegrades. The process continues until the material has biodegraded to nothing more than CO2, water, and humus within months. It does not leave fragments of petro-polymers in the soil.
One of the benefits of oxo-biodegradable plastic is that it can be recycled as part of a normal plastic waste stream. However, if the plastic is not collected it cannot of course be recycled, so it needs to biodegrade instead of accumulating in the environment.
It is suitable for “in-vessel” composting at the higher temperatures required by the new EU animal by-products regulations.
If the Overshoes are sent to landfill, the Oxo-biodegradable plastics fragment and partially biodegrade to CO2 and water in the parts of the landfill where oxygen is present. OXO plastics are designed so that they will not degrade deep in landfill and they will not therefore generate methane (a powerful greenhouse gas) in anaerobic conditions.
Technical Explanation of Oxo-Biodegradable Plastics:
OXO-bio plastic is conventional polyolefin plastic to which has been added small amounts of metal salts, none of which are "heavy metals" which are restricted by the EU Packaging Waste Directive 94/62 Art 11. These salts catalyze the degradation process to speed it up so that the OXO plastic will degrade abiotically at the end of its useful life in the presence of oxygen much more quickly than ordinary plastic.
It does not therefore leave fragments of plastic in the environment. The degradation process is shortened from decades to years and/or months for abiotic degradation and thereafter the rate of biodegradation depends on the micro-organisms in the environment.
It does not however need to be in a highly microbial environment such as compost. Timescale for complete biodegradation is much shorter than for "conventional" plastics which, in normal environments, are very slow to biodegrade and cause large scale harm.