| Item | Index | Analytic result | ||
| High-class products | First class products | Qualified | ||
| Appearance | Colorless transparent liquid | Colorless transparent liquid | Transparent liquid with slightly tincture | Colorless transparent liquid |
| Aldehyde content % ≥ | 99.5 | 99.0 | 98.0 | 99.60 |
| Chlorids %(Cl-) | - | - | - | - |
| Moisture content % ≤ | 0.2 | - | - | 0.14 |
| Ethanol content %(v/v) ≤ | 0.2 | - | - | 0.19 |
| Acetic acid content % ≤ | 0.2 | - | - | 0.01 |
| Conclusion: Pass High-class productsstandard | ||||