Hi, 

I found some Nomex/Kevlar honeycomb sheets in our warehouse and it has been there for a few years. Is this honeycomb still usable and how can I tell?
It has been stored indoors the whole time with a plastic cover over it (it is not sealed).
How does honeycomb degrade over time? How should it be stored to prevent further degradation?

Any help is most appreciated!!!!

Thank you!