Specification :

index content
Purity% g 99.6 99.4 99.0
Sulphate group% f 0.08 0.10 0.20
Loss on ignition( 850 ) % f 0.08 0.10 0.20
Heavy metal % f 0.001 0.002 0.02
Iron content % f 0.0012 0.002 0.01
Chlorides % f 0.003 0.004 0.01
Calcium % f 0.0012 / /