G-18 Glycerol Polyoxyethylene Ether (CAS No.: 31694-55-0), INCI name Glycereth-18, molecular formula C3H5(OC2H4)n(OH)3-n (n≈18), molecular weight approximately 800~900. This product is manufactured by Haian Guoli Chemical Co., Ltd., classified as a nonionic surfactant. The glycerol backbone in the molecule provides the basic hydrophilic structure, while the grafted 18 polyoxyethylene (EO) chain segments endow it with extremely high hydrophilicity and water solubility, making it an ideal choice for O/W emulsion systems.
At room temperature, the product appears as a colorless to light yellow transparent viscous liquid, with no clear melting point, and is hygroscopic. It has good chemical stability, maintaining performance within the pH range of 3~12, but may degrade under strong acids, strong bases, and strong oxidizing agents. The cloud point is greater than 100°C, indicating excellent temperature resistance and solubility in normal pressure water systems. The product is not easily flammable, with a flash point above 150°C, but thermal decomposition may produce irritating or toxic gases.
| Parameter Item | Technical Index |
|---|---|
| Product Name | Polyoxyethylene (18) Glyceryl Ether / G-18 Glycerol Polyoxyethylene Ether |
| CAS No. | 31694-55-0 |
| INCI Name | Glycereth-18 |
| Aliases | Glycereth-18, PEG-18 Glyceryl Ether, Ethoxylated Glycerin (18EO), PEG-18 Glyceryl Ether |
| Molecular Formula | C3H5(OC2H4)n(OH)3-n, n≈18 |
| Molecular Weight | 800~900 |
| Ionic Type | Nonionic |
| Appearance | Colorless to light yellow transparent viscous liquid |
| HLB Value | 18 |
| Active Content | ≥99% |
| Solid Content | ≥99% |
| Moisture | ≤0.5% |
| pH Value (1% aqueous solution) | 5.0~7.0 |
| pH Value (5% aqueous solution) | 5.0~7.0 |
| Density (25°C) | 1.05~1.10 g/cm³ |
| Kinematic Viscosity | 100~200 mm²/s |
| Refractive Index | 1.455~1.465 |
| Surface Tension | 35~40 mN/m |
| Critical Micelle Concentration (CMC) | Approx. 0.1~1.0 g/L (25°C) |
| Cloud Point | >100°C |
| Hydroxyl Value | 180~200 mgKOH/g |
| Acid Value | ≤0.5 mgKOH/g |
| Saponification Value | ≤2 mgKOH/g |
| Iodine Value | ≤2 gI₂/100g |
| Free Alcohol | ≤0.5% |
| Heavy Metals | ≤10 ppm |
| Arsenic | ≤2 ppm |
| Flash Point | >150°C |
| Water Solubility | Easily soluble in water |
| Hygroscopicity | Hygroscopic |
| Alkali Resistance | Resistant to alkali |
| Chemical Stability | Stable within pH 3~12, unstable under strong acids/bases/oxidizing agents |
| Foaming Characteristics | Rich foam, moderate stability |
| Penetration Power | Poor |
Based on its high HLB value of 18, G-18 Glycerol Polyoxyethylene Ether is a typical O/W emulsifier, particularly suitable for formulation design in water-containing systems. In cosmetics and personal care products, it is recommended for creams, lotions, facial cleansers, makeup removers, and fragrance solubilization systems. The recommended dosage is generally 1%~5%, subject to optimization based on the specific formulation. In the textile industry, it can be used as an antistatic agent and softening finishing agent; in metalworking fluids, it provides both lubrication and rust prevention functions; in coatings and inks, it serves as an efficient wetting and dispersing agent, offering excellent dispersion stability for pigments and fillers.
Since the product is easily soluble in water and hygroscopic, it should be used promptly after opening and stored sealed. When compounding, it is compatible with anionic, cationic, and other nonionic surfactants, offering broad applicability.