HYDROQUINONE

REFERENCE No: 115 – 07 – 016 - 00.

A. FORMULA : C6H4(OH)2                                           F.Wt. : 110.11           

B. OTHER NAMES :

    1. Para dihydroxy benzene
    2. Quinol
    3. Hydroquinol

C. SPECIFICATIONS


1.

Appearance

Shining white crystalline powder free from lumps and external visible impurities.

2.

pH of 5% aqueous solution

4.0 – 5.3

3.

Clarity of 5% aqueous solution in water

Clear and colourless

4.

Clarity of 5% solution in dilute acetic acid
(1+19) 200C

Clear and colourless free from any suspended matter.

5.

Assay               (Min)

99 %

6.

Melting point

170 – 1740C

7.

Ash                 (Max)

0.1 %

8.

Iron as Fe        (Max)

0.002%

9.

Heavy metals as pb  (Max)

0.001 %

10.

Transmittance of 5% aqueous solution between 400 – 465 millimicron    (Min)

96 %

11.

Practical test

Passes the test

D. QUANTITY OF SAMPLE REQUIRED FOR TEST : 500 gms.

E. MODE OF PACKING

           Packed in double polythene bags each 200 gauges, heat sealed separately and kept in thick card board box and properly sealed.  The whole thing is covered completely with polythene cover and sealed at the top.  The final packing should withstand hazards in transit.  All packing in direct contact with contents shall be photographically inert.