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Appearance : White crystal Assay : 98.0 – 102.0% Fluoride : 50mg/kg (max) Phosphorous pentoxide content : 50.0 – 52.5% Loss on ignition : 8.5% (max) Arsenic : 3mg/kg (max) Lead : 4mg/kg (max) Cadmium : 1mg/kg (max) Mercury : 1mg/kg(max)