Assay(as KNO3) 99.7 % Anticaking 0.15 % Chloride(CL-) 150 ppm PH(10% solution) 7.1   Loss-on Drying 800 ppm Ins.matter 150 ppm Sodium(Na) 150 ppm calcium(Ca) 13 ppm Magnesium(Mg) 5 ppm Iron(Fe) 3 ppm Chloride (as C1) 160 ppm Water Incoluble matter