... %[Quality standard]qualified with the standard [GB4293-84] excellent grade. parameterdataFood grade & Dentifrice gradeIndustry first gradeContent(NaF)%>=9998SiO2%<=0.40.5Na2CO3%<=0 ... welding flux, toothpaste additive, water treatment chemicals,preservative, bactericide, slagging medium of metallurgy, adhesive, papermaking and constrution industryAppearance: white powder/crystal sodium fluoride