CAS number： 50-78-2
Molecular formula： C9H8O4
molecular weight： 180.16
Chemical structure：
| Product Name | ASPIRIN | |
| Shelf life | 3 years | |
| Test items | Specifications | Results |
| Characters | White crystal or crystalline powder slightly | Complies |
| Soluble in water and Freely soluble in alcohol(96%) | Complies | |
| At about 143℃ | 142.8℃ | |
| Identification A | Sample Infrared absorption spectropho-tometry Complies with Aspirin CRS | Complies |
| Identification B | A crystalline precipitate is formed, Melting point is 156-161℃ | Postive |
| 156.4-160.1℃ | ||
| Appearance of solution | Solution is clear and colourless | Solution is clear and colourless |
| Related substances | Any impurities not more than 0.1% | 0.03% |
| The sum of impurities not more than 0.25% | 0.06% | |
| Heavy metals | ≤20ppm | ＜20ppm |
| NMT20ppm | ||
| Loss on drying | ≤0.5% | 0.03% |
| NMT0.5% | ||
| Sulphated ash | ≤0.1% | 0.03% |
| NMT0.1% | ||
| Assay (dried substance) | Contains C9H8O4 99.5% TO 101.0% | 99.70% |
| Conclusion: The product comply with the requirements of BP2010 | ||
