Tag Archives: bioplastics

JUNK SCIENCE: How Politicians, Corporations, and Other Hucksters Betray Us

The book titled JUNK SCIENCE: How Politicians, Corporations, and Other Hucksters Betray Us by Dr. Dan Agin was very interesting book. Dr. Agin has a Ph.D. in biological psychology and thirty years of laboratory-research experience in neurobiology and is an associate professor emeritus of molecular genetics and cell biology at the University of Chicago.

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Sorting out Biodegradable Plastics

There are three main categories of degradable plastics: biodegradable plastics, compostable plastics and degradable plastics.  One of the biggest contributions to the confusion surrounding the subject of degradable plastics is a combination of the lack of common definitions and the loose usage of these definitions.

 

The ASTM International, originally known as the American Society for Testing and Materials, is a standards organization, host to committee D20.96 on Environmentally Degradable Plastics and Biobased Products.  The ASTM maintains a Standard Terminology Relating to Plastics under their designation: D 883 – 08.  The following are the ASTM definitions for degradable plastics:

 

biodegradable plastics—a degradable plastic in which the degradation results from the action of naturally-occurring micro-organisms such as bacteria, fungi, and algae.

 

compostable plastic—a plastic that undergoes biological degradation during composting to yield carbon dioxide, water, inorganic compounds, and biomass at a rate consistent with other known compostable materials and leaves no visually distinguishable or toxic residues.

 

degradable plastic—a plastic designed to undergo a significant change in its chemical structure under specific environmental conditions resulting in a loss of some properties that may vary as measured by standard test methods appropriate to the plastic and the application in a period of time that determines its classification.

 

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