... HS NO.2834.2190, UN NO.1486,CLASS 5.1 Potassium nitrate colorless crystal powder, Relative density2.1109, Melting Point 333°C ... industry used in the manufacture of ceramic glazes. heat bath. Potassium nitrate in food consumption industry as a hair color agent; preservatives ... , such as for bacon, luncheon meat played a preservative.. Potassium Nitrate industrial grade KNO3 CAS NO#7757-79-1