Engineers Discarding Excessive Materials?

So I've hit my limit. If I discard the material, is it going to ask me how much I want to discard or is it all going to disappear? Guess I don't have the balls to try it myself.
 
I wouldn't recommend discarding beyond 9 - you need three modules in each acess tier of the highest grade available to rank up, and the as highest amount of materials of a specific type needed for one upgrade was 3. If you keep at least those 9, therefore, you'll always be able to get to access 5 really easily.
 
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