Index Name High Grade First Class Standard Total Alkalinty (as Na2CO3%) 99.2 98.8 98.0 Chloride(as Nacl) 0.7 0.9 98.0 Iron(Fe) 0.004 0.008 0.010 Water insoluble 0.04 0.10 0.15 Loss on ignition 0.8 1.0 1.3