Item

Index

Super Grade

First Grade

Qualified Grade

NH4SCN   % Min

99.0

98.0

97.0

Clarity Test in water(100g/L)

Clarity

pH Value in water (50g/L)

4.5-6.0

4.5-6.0

4.5-6.0

Chloride (CL - )   % Max

0.01

0.01

0.02

Sulfate(SO4 2- )   % Max

0.01

0.01

0.03

Residue on ignition, % Max

0.02

0.02

0.02

Heavy metal (Pb), % Max

0.002

0.002

0.002

Iron ( Fe ) % Max

0.0001

0.0003

0.008

Water     % Max

1.0

1.8

2.0