Hi there
in many cases hydrazines are combustible/explosive when dry and exposed to air.
hydrazine vapor in air is flammable at 4.7 to 100% hydrazine by volume - handle under nitrogen!
Some metals and alloys including monel, bronze, brass, cadmium, gold,
molybdenum, and stainless steel with more than 0.5% molybdenum
or rust cause decomposition of hydrazine
so keep it 'wet' and under nitrogen
hope this helps