Assay(NaHF2)                    98.0 min.
Water-insoluble matter    0.5 max.
Free acid(HF)                     0.2 max.
              Cl                            0.1max
             SO4                         0.1max  
              H2O                        0.2max
Glanularity (through 325 M sieve) 3max
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