| CAS No.: | 57-55-6 |
|---|---|
| Formula: | C3H8O2 |
| EINECS: | 200-338-0 |
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Propylene glycol is a widely used polyol, propylene glycol is normally a colorless viscous liquid, almost tasteless, fine smell slightly sweet. Propylene glycol can be used as a raw material of unsaturated polyester resin and as a wetting agent in cosmetic skin care products.
The specific role of propylene glycol in cosmetic skin care products:
Cosmetic grade propylene glycol, such as commonly used ointment, mask, lotion, facial cleanser, essence, makeup remover, moisturizing lotion and plant extract can be seen this ingredient. Generally, it is the hydrophilic moisturizing ingredient commonly found in makeup remover. The real effect is to help dissolve dirt and avoid skin drying too quickly during makeup remover. It is also often used in toners and essences. In addition to moisturizing ability, it can help active ingredients penetrate, and also help anti-corrosion ability; Propylene glycol is a small molecular moisturizing ingredient that keeps water in the stratum corneum.
| 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 |
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