Item

Pharma Grade

Food grade

content %

85-90

80-85

content %

85-90

80-85

colour (HPHA)

≤35

≤50

Iron %

≤5

≤10

arsenate (PPM)

≤1

≤1

Calcium salt

qualified

qualified

chloride(PPM)

≤20

≤30

sulphate(PPM)

≤50

≤60

Heavy metal(Pb) (PPM)

≤5

≤10

Optical purity %

≥95

≥95

Residual on ignition%

≤0.1

≤0.1

Thermal stability

≥190

≥190

Insoluble matter in acid

qualified

qualified

Methyl alcohol %

≤0.2

≤0.2

Free carbonizing

qualified

qualified

Reductive Matter

qualified

qualified

Free acid

qualified

qualified