I'm storing water under low pressure (3 psig) in a PU-coated fabric cylinder and I'm trying to define the profile of the bag when it's sitting on a flat surface (to determine area, hence volume and mass).
In zero-g, it would be round, naturally. But the force of gravity will deform the bag...
One general source for materials information is the SAMPE webpage -- the Society for Advanced Materials and Process Engineering (or something to that effect). There are a number of links from their Helpful Reference page.<br>
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<A HREF="http://www.sampe.org" TARGET="_new">www.sampe.org</A>