CHARACTERISTICS OF QUALITY SPECIFICATION Humidity (volatile (%) Max. 5,0 Calcium (%) Max. 24,0 Total Phosphorus (%) Min. 18,0 Insoluble residue (%) Max. 2,0 Ratio Phosphorus /Fluorine Min. 100:1 Solubility in Citric Acid (%) Min. 90,0 2% 1:100 HEAVY METALS Lead (ppm) Max. 30,0 Arsenic (ppm) Max. 12,0 Mercury (ppm) Max. 0,20 Cadmium (ppm) Max. 5,0 Vanadium (ppm) Max. 250