... ASSAY (as KNO3)99.4% minPOTASSIUM OXIDE (as K2O )46.0% minNITROGEN13.0% minMOISTURE0.1% maxWATER INSOLUBLES0.02% ... .03% maxIRON(as Fe)0.002% maxNITRITES0.01% maxHEAVY METAL (as Pb)0.001% maxPARTICLE SIZE100% -20 mesh, ... protected from moisture. ApplicationGlass, Explosives, Pyrotechnics, Matches, Fertilizers, Metal Heat Treatment and Heat Transfer, Ceramics, Oxidizer, Petrochemicals, Toothpaste, ...