| Appearance | White or almost white powder |
| Melting Point | 79.0~83.0℃ |
|
Specific Optical Rotation |
-2°~2° |
|
Loss on Drying |
0.50% max. |
|
Residue on Ignition |
0.10% max. |
|
Heavy metals |
15ppm max. |
|
Total Related Impurities |
1.0% max. |
|
m-Dihydroxybenzene |
10 ppm max. |
|
Assay |
99.0% min. |