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4 Responses

  1. Avril Sainsbury 17 November 2017 at 12:42 | | Reply

    Hi Can you tell me if PHA needs to be put in an industrial composter to biodegrade please? If left in the environment or landfill how long will it take to biodegrade then? Thank you.

  2. Phil 16 June 2019 at 19:50 | | Reply

    The decomposition testing has a big flaw, the article under test is always placed in perfect soil, and not in a medium of other manmade waste such as what actually happens in landfills. Does the testing ever include anaerobic conditions where there is no actual dirt present, just a medium of other materials such as newspaper & petrochemical plastics? I suspect a lot of these ‘biodegradable’ plastics will not actually breakdown in real-world conditions. They rely too much on microbes living in soils

  3. Lyman 31 August 2019 at 10:42 | | Reply

    The standard test for “Biodegradability” is 58°C +/-2 , 95% humidity, and ample access to micro-organisms . Under these conditions it should be fully decomposed within 180 days.

    So, yes in the real world it depends on the conditions. In the ocean its about 3 years. In other places/conditions it could take up to 10.

  4. Robert Eckersley 17 October 2019 at 16:11 | | Reply

    I have some PHA old virgin pellet in 25 kg valve sack in the valve sacks outer coat is damaged However, the iner coat is fully intact ( the inner liner is silver in colour and heat sealed. The material has bee in stock for 3 years in good conditioned environment.
    Could it be in its original form ?

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