Total alkali content

99.2% min

99.5%

Chlorides (NaCl)

0.7% max

0.35%

Sulphate(SO₄)

0.03% max

0.015%

Iron(Fe₂O₃)

0.004% max

0.0017%

Water insoluble matter

0.04% max

0.006%

Result

First grade