This diamino alkane, also known as undecamethylenediamine, presents as a white to almost white crystalline powder. Store in a refrigerator, under inert gas and protected from moisture - this substance is hygroscopic. 1,11-Diaminoundecane is known to be incompatible with oxidizing agents and should not be stored or handled in their vicinity. This chemical causes skin irritation in addition to serious eye irritation.