Comment by Composite Analytica on 04 Mar 2011 at 12:21:29
Is there any indication of what sort of TPE is used or is of preferential use? By biological attack, do you mean fugitive emissions of e.g. NH3? This depends on a lot of physical-chemical parameters, which requires quite specific insight in the application, processing, etc.
You can be quite sure that the TPE loses mechanical properties in the presence of the urine. How much exactly depends on many factors. I cannot give you any bootstrap indication because the analysis is complex, for example read this (from another recent forum post):
"I found that dry Polyamide 6 has an E modulus of 3.1 GPa, with 3 wt% Water E becomes 1.1 GPa, and with 6 wt% Water it decreases to 0.7 GPa.".
So in presence of a relative strong solvent, 80% reduction is not impossible. We developed CheFEM code to deal with this, also check the CheFEM section.
Hope this helps,