Potassium nitrate 1) 99.4% min 2) White crystal /power or granular 3) ... % min Colorless crystal or white crystal powder HS NO.2834.2190, UN NO.1486,CLASS 5.1Potassium nitrate colorless crystal powder, Relative ... for bacon, luncheon meat played a preservative.. Potassium Nitrate KNO3 CAS NO#7757-79-1