| 1 | Description | White, odorless crystalline powder. | White, or almost white odorless granules or crystalline powder. | USP-NF/CP |
| 2 | Solubility | Complies | Soluble in alcohol; slightly soluble in water and in ether. | USP-NF |
| 3 | Identification A (By IR) | Complies | IR spectra of the sample should be concomitant with IR spectra of the corresponding standard. | USP-NF/CP |
| 4 | Identification B (By chemical test) | Complies | The colour of bromide should be faded. | CP |
| 5 | Identification C (By HPLC) | Complies | The retention time of the fumaric acid peak of the sample solution corresponds to that of the standard solution as obtained in the assay. | In-house |
| 6 | Identification D (By HPLC) | Complies | The retention time of the principal peak in the chromatogram of the test solution corresponds to that of the principal peak in the chromatogram of the reference solution. | CP |
| 7 | Limit of Maleic acid | Not detected | NMT 0.1% | In-house |
| 8 | Limit of Malic acid | 0.08% | NMT 1.5% | In-house |
| 9 | Maleic acid | 0.003% | NMT 0.1% | CP |
| 10 | Any other individual impurity | 0.01% | NMT 0.1% | CP |
| 11 | Total impurities | 0.01% | NMT 0.2% | CP |
| 12 | Residue on ignition | 0.01% | NMT 0.1% | USP-NF/CP |
| 13 | Heavy metals | Less than 0.001% | 0.001% | CP |
| 14 | Water | 0.4% | NMT 0.5% | USP-NF/CP |
| 15 | Assay (Anhydrous basis) | 99.9% | 98.0%-102.0% | In-house |
| 16 | Assay (on anhydrous basis) | 99.8% | NLT 99.0% | CP |