Potassium Nitrate

CAS RN:7757-79-1

Decomposition

When heated to decomp it emits very toxic fumes of /nitrogen oxides & dipotassium oxide/.
Boiling point 400 deg C (decomp)
... /Potassium nitrate/ decomposes on heating producing nitrogen oxides, oxygen, which increases fire hazard.
Find more information on this substance at: Hazardous Substances Data Bank , TOXNET , PubMed