Complaint
Propylene glycol is used as an essence dissolving agent in tobacco oil.
| Specification | Index | Result |
| Appearance | Colorless, viscous, clear hygroscopic liquid without odor | ---- |
| Identification | IR test | - |
| Assay (Purity) | 99.5% min | 99.68% |
| Specific gravity | 1.035 - 1.037 g/cm3 at 25 °C | 1.036 |
| Index of refraction | 1.431 - 1.433 nD20 | 1.433 |
| Acidity | ≤ 0.20 ml of 0.10 N NaOH | 0.15 |
| Water/Moisture | 0.2% max | 0.18% |
| Residue on ignition | 0.004% max | 0.003% |
| Chloride | 5 ppm max | 4 |
| Heavy metals(as Pb) | 5 ppm max | 4 |
| Sulphates(as SO42-) | 10 ppm max | 8 |
| Oxidizing substances | Not required | -- |
| Arsenic | 5 ppm max | 4 |
| Color | 5 | 5 |
| Reducing substances | Not required | -- |
| Organic volatile impurities | Chloroform: 60 ppm 1,4-dioxane: 400 ppm Methylene chloride: 600 ppm d. Trichloroethylene: 100 ppm | --- |
