... HS NO.2834.2190, UN NO.1486,CLASS 5.1 Potassium nitrate colorless crystal powder, Relative density2.1109, Melting Point 333°C ... and other raw materials. pharmaceutical industry for the production of potassium penicillin, rifampin drugs. used for making cigarette paper. used ... ; preservatives, such as for bacon, luncheon meat played a preservative.. Potassium Nitrate Fertilizer GradeCAS NO#7757-79-1