Molecular formula K5P3O10 CAS Number: 13845-36-8 Standard executed: National standard Guaranteed Technical Specifications: Specifications Tech Grade Food Grade FCC-IV Appearance White powder White powder White powder Main contents , as K5P3O10 % e 95.0 95.0 95.0 Phosphorus pentoxide( P2O5) % e 46.0 46.0 46.0 PH of 1% water solution 9.2-10.1 9.2-10.1 9.2-10.1 Heavy metals, as Pb 10ppm 10ppm Arsenic, as As 3ppm 3ppm Fluoride, as F 30ppm 10ppm Water insoluble % d 1.0 1.0 2.0