Is that by TGA? If so how (above 700)?
TGA is not a correct method for determining biodegradability of materials.
for information about biodegradability tests and methods please see articles below:
http://onlinelibrary.wiley.com/doi/10.1002/%28SICI%291097-0126%281998100%2947:2%3C89::AID-PI86%3E3.0.CO;2-F/abstract
http://www.sciencedirect.com/science/article/pii/S0045653508008333
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