Astm standards for plastics
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The term "oxo-biodegradation" is defined as per CEN/TR 15351:2006, as "degradation identified as resulting from oxidative and cell-mediated phenomena, either simultaneously or successively".
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This specification has better helped categorise oxo-biodegradable products and their performances. Many Reverte TM customers have tested Reverte TM based products under this protocol in part or completely with excellent results, proving both mineralisation and safety of the product.Ī British Standard specification which incorporates many of the salient features of ASTM 6954 outlining the methods used to determine oxo-biodegradability in polymer substrates, was published in June 2011 and entitled "Methods for the assessment of the oxo-biodegradation of plastics and of the phyto-toxicity of the residues in controlled laboratory conditions". Tier 3 – the residue from Tier 2 is then subjected to soil toxicity testing. Tier 2 – the mineralisation stage, this can be performed under a number of ASTM test methods but the oft used is ASTM 6400 composting specification to determine the rate and degree of mineralisation over a given time period using the material from Tier 1. Sufficient material must be generated from this stage to go into Tier 2 and 3. The gel content measurement ensures that the prodegradant is not crosslinking the polymer into much more difficult entities to biodegrade. The molecular weight should finish below 5000 and there should be less than 5% gel. The material is monitored and the molecular weight determined. Tier 1 – is the exposure and subsequent measurement of the oxidation stage, this can be accomplished simply by thermal, UV or a combination of these accelerators. The test has to be completed in succession and material generated from Tier 1 pass to Tier 2 then to Tier 3 otherwise the process is meaningless. Including first stage oxidation and molecular weight reduction, mineralisation and finally soil toxicity. This document sets out a framework to determine oxo-biodegradability encompassed in a three tier testing regime. ASTM 6954 Standard Guide for Exposing and Testing Plastics that Degrade in the Environment by a Combination of Oxidation and Biodegradation.