... High quality and Prompt shipment. Potassium Nitrate Purity: 99.8%Min K2O: 46%Min Nitrogen: 13.5%Min SGS Certificate. High quality and Prompt ... Sulphate(as SO42- )% ≤0.0050.01 % ≤0.01 Hygroscopicity% ≤0.250.30 % ≤0.25 Iron(Fe)% ≤0.003 % ≤0.003 K2O % ≤ 46Nitrogen ( in nitrate ) % ≥ 13.5Particle ... -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 ...