Cas number: 7778-77-0 Standard executed: tech grade (hg2321-1992) food grade(national standard) Packing and storage: In 25kg, 50kg, 1000kg net bags, store at a cool, dry and well ventilated place. Guaranteed technical specifications: Specifications Tech grade food grade fcc-iv Main contents % í² 99.0 99.0 98.0 P2o5 % í² 51.5 51.50 51.50 Potassium oxide (k2o) % í² 34.0 34.0 34.0 Ph value of 1% solution 4.3-4.7 4.3-4.7 4.3-4.7 Moisture % ín 0.20 0.20 0.20 Heavy metal, as pb 10ppm 15ppm Arsenic, as as 3ppm 3ppm Fluoride as f 50ppm 10ppm Water insoluble % ín 0.20 0.10 0.2 Loss on drying % ín 1.0 1.0 1.0 In 25kg, 50kg, 1000kg net bags, store at a cool, dry and well ventilated place.