Item Requirement Result Appearance Gray powder Complies Phosphorus(p) 22.0% 22.1% Calcium(Ca) 15.0%--18.0% 17.0% Arsenic(As) 30ppm 10ppm Heavy Metals(Pb) 30ppm 10ppm Fluoride(F) 0.20% 0.15% Size(Pass 500um),min 95% 98.5%