We store our prepreg in an enviroment of 10% RH and 65 degrees F 
This prepreg is mil certified FR4.  After 6 months of sitting on the 
shelf, this material is no longer certified by our supplier as mil 
spec.  This material could then be used on non mil spec work.  What 
method and  what time frame should be used to determine when the 
material should be thrown out?  (not used on anything)  In other 
words, after the six months, we know the material is not scrap, but at 
what time will it actually become defective? Any input on this 
subject would be appreciated  Thank you..

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