... GradeUnitIndustrial GradeAgriculture GradePurity% ≥99.799.499.0% ≥99.897.5Moisture% ≤0.100.100.30% ≤0.10 Chloride(as Cl- )% ≤0.010.020.10% ≤0.01-0.030.80Insoluble matter in ... .5Particle Size0.2-2.5 , 1-3 , 2-5 , 0.2-5MM0.2-2.5 , 1-3 , 2-5 , 0.2-5 Potassium Nitrate 99.4%min ,nitrate ... de potassium fertilizer(46-0-13.5)