This aryl diisocyanate, also known as benzene 1,4-diisocyanate, presents as a white to very pale-yellow crystalline powder. Store in a refrigerator, under inert gas. This substance is heat sensitive and moisture sensitive. 1,4-Phenylene Diisocyanate is known to be incompatible with oxidizing agents, strong acids, strong bases, and amines and should not be stored or handled in their vicinity.