Ingredient Industrial Grade Food Grade KH2PO4 % 99.0 99.0 P2O5 % 51.50 51.50 K2O % 34.0 34.0 PH Value (1% water solution) 4.4-4.8 4.4-4.8 Chloride (Cl) % 0.2 0.014 Moisture (H2O) % 0.2 0.2 Heavy Metal (Pb) % 0.001 Arsenide (As) % 0.0003 Fluoride (F) % 0.005 Water Insoluble % 0.10 0.10 Featrues White or colorless crystal, relative density at 2.338, melting point at 252.8, easily soluble in water, PH 4.4-4.8 of 1% water solution Tips 1. As the P, K compound fertilizer is suitable for foliar fertilizing and drip irrigation fertilizing. Also it is the raw material of N, P, K compound fertilizer. 2. Be widely used to make medicine, food and metaphosphate.