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Main contents % max99.0 99.0 P2O5 % max51.50 51.50 Potassium oxide (K2O) % max34.0 34.0 PH value of 1% solution 4.3-4.7 4.3-4.7 Moisture % min0.20 0.20 Heavy metal, as Pb % min0.001 Arsenic, as As % min0.0003 Fluoride as F % min0.005 Water insoluble % min0.20 0.10 mkp