... .5%Min SGS Certificate. High quality and Prompt shipment. Potassium Nitrate Purity: 99.8%Min K2O: 46%Min Nitrogen: 13.5%Min ... ) % ≥ 13.5Particle 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 ...