... 2190, UN NO.1486,CLASS 5.1Potassium nitrate colorless crystal powder, Relative density2.1109, Melting ... Point 333°C. Use: Mainly for CRT glass bulbs, auto lights bulbs, glass clarifying ... of ceramic glazes. heat bath. Potassium nitrate in food consumption industry as a hair color ... ; preservatives, such as for bacon, luncheon meat played a preservative.. Potassium Nitrate KNO3 CAS NO#7757- ...