An earlier database used information provided by the materials' suppliers, but its data proved incomplete and, due to the use of different standards, the data was not comparable. Now available online, however, is the second generation of the Biopolymer Database, managed by Hannover University of Applied Science and Arts (Fachhochschule) and M-Base (Aachen, both Germany).  

This second edition is more valuable by far in that the team at Fachhochschule Hannover collected material samples from most suppliers and performed comparable material tests on the various bioplastics marketed. This newly generated data, broadcast at M-Base's website, allows direct comparison of grades and searches over all suppliers.

The kicker is that the access to the system is free here.  The partners openly state that the data content is not complete and will be extended on a continuous basis, but it sure is a good starting point to be better informed about the mechanical properties of available bioplastics.