Total alkali content :                                ≥99.2%  min

Chlorides(NaCl):                                   ≤0.70%  max

Sulphate(SO4):                                     ≤0.03% max

Iron(Fe2CO3):                                     ≤0.0035%  max

Water insoluble matter :                             ≤0.03%  max

Lignition loss:                                      ≤0.80%  max