Appearance: Colourless crystalline powder.

Assay: 99.0% to 100.5% I.P./B.P., 99.5% to 101% U.S.P. of C7H6O3 with reference to substance dried over Silica Gel for three hours.

Odour: Almost Odourless

Melting Range: 158.5 0 C to 161.0 0 C

Appearance of Solution/Clarity & Colour of Solution:
Passes test as per B.P./I.P

Sulphated Ash/Residue on Ignition: 0.1% w/w (I.P./B.P.Limit) / 0.05%w/w (U.S.P. Limit)

Chloride: 125 ppm (max.) I.P./100 ppm (max.) B.P.

Sulphate: 0.02% (max.) I.P./140 ppm U.S.P.

Related Substance: Complies with the B.P. test

Loss of Drying: 0.5% (max.) B.P.

Iron: 2 ppm (max.) I.P.