Bismuth(V) fluoride

An irritant poison via ingestion and inhalation routes. Decomposes vigorously and sometimes ignites on contact with moisture to yield O3 and bismuth trifluoride. Very dangerous. Reacts violently with water and petrolatum above 50°, and acids at room temperature, liberating much heat and ozone. When heated to decomposition it emits highly toxic fumes of F−. See also FLUORIDES and OZONE.