Propylene glycol CAS No.57-55-6,Transparent viscous liquid.Colorless viscous stable water-absorbing liquid, almost odorless, flammable, low toxicity.
| Items | Unit | Specification | Results |
| Identification | — | passed | passed |
| Appearance | — | Colorless clear viscous liquid | Colorless clear viscous liquid |
| Assay | % | 99.80 min | 99.92 |
| EG | ppm | 50max | 0 |
| DEG | ppm | 50max | 0 |
| Residue on lgnition | mg | 2.5max | 0.8 |
| Chloride | Weight % | 0.007max | <0.007 |
| Sulfate | Weight% | 0.006max | <0.006 |
| Heavy metals | ppm | 5max | <5 |
| Specific Gravity | 25℃ | 1.035-1.037 | 1.0354 |
| Acidity(0.1N NaOH) | ml | 0.05max | 0.03 |
| Moisture | Weight % | 0.10max | 0.050 |
| Fe | ppm | 0.1max | 0 |
| Color | Pt-Po | 10max | <10 |
| IBP | ℃ | 184 | 185 |
| DP | ℃ | 189 | 187 |
Propylene glycol CAS No.57-55-6 is an important raw material of unsaturated polyester, epoxy resin, polyurethane resin, plasticizer and surfactant.
As hygroscopic agents, antifreeze agents, lubricants and solvents in the food, pharmaceutical and cosmetic industries.
In the food industry, which reacts with fatty acids to form propylene glycol fatty acid ester, which is mainly used as food emulsifier.
