Radiant Barrier Discussion

I already purchased some radiant barrier products and it's really help in reducing the heat gain into my house and now I am planning to install more. So I surf the internet to find more information about it and found some technical data sheet. I don't really understand why radiant barrier must undergo for wet delamination test, folding endurance test and shrinkage test? i mean, does all these tests are really crucial as if not doing it will effect the radiant barrier's performance? As I know radiant barrier must be install in dry condition and left in dry condition. So why it is a must to test it for wet delamination? Does the folding endurance & shrinkage have any effect to the performance? Usually after we have done with the installation, there is no more folding or unfolding the radiant barrier. I need help with these. someone please enlighten me. thank you in advance.