The Myth of Biodegradability (article)

http://boss.blogs.nytimes.com/2012/02/09/the-myth-of-biodegradability/?ref=compost&_r=0 Over the past quarter century the idea of green business has expanded from a fringe group of hippie capitalists trying to increase environmental consciousness to mainstream corporations trying to establish a global standard for sustainable business. Today, most major companies have social responsibility departments, and moving to greener practices is a priority. Frankly, it’s one of the reasons my business, TerraCycle, is flourishing. This new landscape is encouraging but full of challenges and pitfalls. A great example is the almost blind embrace of all things “biodegradable.” I used quotation marks around the term because there is disagreement as to what it means. And the debate about whether businesses should embrace biodegradable plastic — P.L.A., or polylactic acid — for use, say, as packaging or in utensils, is an important…

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When the Left-Hand doesn’t know what the Right-Hand (PLA) is doing.

originally found here: http://woodsend.org/2013/09/left-hand-doesnt-right-hand-pla-doing/ American and European consumers are very familiar with PLA widely marketed as compostable for just about everything from chip-bags to golf-tees.  This renowned PLA, a biological plastic made from a “left-hand” lactic-acid molecule, also has a quirk:  it requires a pre-heat phase before it will actually biodegrade. That trait is referred to as Tg or “glassy transition” in the trade.  Tg is a feature of all plastics and can occur over a very wide range of temperatures, but none as convenient as PLA’s at 55-58°C, making it eligible to be called compostable,- that is, if the compostability test is conducted at or just above the Tg  temperature. To be certified compostable means a standard is upheld such as ASTM 6400 for USA or EN 13432 for…

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