... powder HS NO.2834.2190, UN NO.1486,CLASS 5.1 Potassium nitrate colorless crystal powder, Relative density2.1109, Melting Point ... 333°C. Use: Mainly for CRT glass bulbs, auto lights bulbs, glass clarifying agent. Used ... as a hair color agent; preservatives, such as for bacon, luncheon meat played a preservative.. Potassium nitrate for sale CAS NO#7757-79 ...