Ammonium Thiocyanate

CAS #: 1762-95-4

Synonyms: Ammonium Isothiocyanate; Ammonium rhodanide; ammonium sulfocyanide; ammonium sulfocyanate; Thiocyanic Acid, Ammonium Salt

Uses: Analytical chemistry; chemicals (thiourea); fertilizers; photograghy; ingredients of freezing solutions, especially liquid rocket propellants; fabric dyeing; zinc coating; weed killer; and defoliant; adhesives; curing resins; pickling iron and steel; electroplating; temporary soil sterilizer; polymerization catalyst; separator of zirconium and hafnium, and of gold and iron.

Hazard:  Inhalation of dust causes irritation of nose and throat. Ingestion causes dizziness, cramps, nervous disturbances. Dust irritates eyes. Can be absorbed through skin; prolonged contact may produce various skin eruptions, dizziness, cramps, nausea, and mild to severe disturbance of the nervous system.  AMMONIUM THIOCYANATE can release ammonia vapors if mixed with a chemical base or with an acid. Violent or explosive reactions have occurred when thiocyanates are mixed with oxidizing agents (such as chlorates(potassium chlorate), nitrates, nitric acid, and peroxides). Nitric acid violently oxidized a thiocyanate solution [Bretherick 1979 p. 121]. An explosion of guanidine nitrate demolished an autoclave built to withstand 50 atmospheres, in which it was being made from ammonium thiocyanate and lead nitrate.