Items

Grade A

Grade B

Grade C

Grade D

Purity  [K₃Fe(CN)₆]

98.5% min

99.0% min

99.5% min

99.5% min

Chloride [ KCl ]

0.40% max

0.25% max

0.20% max

0.05% max

Sulphate  [SO₄2– ]

—

—

—

0.01% max

K₄Fe(CN)₆

0.40% max

0.30% max

0.25% max

0.25% max

Water insoluble matter

0.03% max

0.025% max

0.020% max

0.020% max

Na+

—

—

 —

0.20% max

Items

ACS Grade

Chemical Purity

Analysis Purity

Purity [K₃Fe(CN)₆]

99.0% min

99.0% min

99.50% min

Chloride [ Cl– ]

0.01% max

0.02% max

0.005% max

Sulphate [ SO₄2– ]

0.01% max

0.01% max

0.005% max

K₄Fe(CN)₆

0.05% max

0.10% max

0.02% max

Water insoluble matter

0.005% max

0.01% max

0.005% max

Na+

—

—

0.02% max