Polyethylene glycol PEG-300 (CAS No.: 25322-68-3) is a non-ionic surfactant produced by Guoli Chemical, with the molecular formula HO(C2H4O)nH, where the average degree of polymerization n≈6, and the molecular weight distribution ranges from 285 to 315. The product appears as a colorless to slightly yellow transparent viscous liquid, almost odorless, with excellent chemical stability and low volatility, remaining stable in acidic, alkaline, and hard water environments.
The product has an HLB value of approximately 16.5, indicating strong hydrophilicity, and a cloud point >100°C, demonstrating good high-temperature stability. The freezing point is -15 to -8°C, the flash point is >200°C, and under normal storage and handling conditions, there is no risk of flammability or explosion, classifying it as a non-hazardous material. The product is hygroscopic, so it should be sealed tightly after opening.
PEG-300 is readily soluble in water, ethanol, and acetone, with good dissolution compatibility. Its surface tension is approximately 44.5 mN/m, and its foam performance is low-foaming or non-foaming, making it suitable for applications requiring low foaming characteristics. The core functions of the product include excellent emulsifying, wetting, dispersing, and solubilizing capabilities, which can be widely applied in fields such as pharmaceuticals, daily chemicals, industry, coatings, and pesticides.
| Parameter Category | Parameter Name | Value/Description |
|---|---|---|
| Basic Physical Properties | Appearance | Colorless to slightly yellow transparent viscous liquid |
| Ionic Type | Non-ionic | |
| Molecular Weight | 285~315 | |
| Density (20°C) | 1.11~1.13 g/cm³ | |
| Active Content | ≥99% | |
| Thermodynamic Parameters | Freezing Point | -15~-8°C |
| Flash Point (Closed Cup) | 195°C~234°C (>200°C) | |
| Autoignition Temperature | Approximately 310°C~350°C | |
| Cloud Point | >100°C | |
| Recommended Operating Temperature | Below 170°C | |
| Chemical Indicators | Hydroxyl Value | 356~394 mgKOH/g |
| Acid Value | ≤0.2 mgKOH/g | |
| Saponification Value | ≤1.0 mgKOH/g | |
| Iodine Value | ≤0.5 gI₂/100g | |
| Amine Value | ≤0.1 mgKOH/g | |
| Unsaturation | ≤0.1 mmol/g | |
| pH Value | pH of 1% Aqueous Solution | 4.5~7.5 |
| pH of 5% Aqueous Solution | 4.5~7.5 | |
| Water Content | ≤1.0% | |
| Viscosity Parameters | Kinematic Viscosity (40°C) | 60~75 mm²/s |
| Low Shear Viscosity | 60~80 mPa·s | |
| Refractive Index | 1.466~1.468 | |
| Surface Properties | HLB Value | 16.5 |
| Surface Tension | Approximately 44.5 mN/m | |
| Purity Indicators | Free Alcohol | ≤0.2% |
| Heavy Metals (as Pb) | ≤10 mg/kg | |
| Arsenic (As) | ≤2 mg/kg | |
| Safety | Explosivity | Non-explosive |
| Oxidizing Properties | Non-oxidizing |
Thanks to its excellent solubility and safety, PEG-300 can be used in the pharmaceutical field as an ointment base, suppository base, pill carrier, and injection solvent, with good biocompatibility. In the daily chemical industry, it is widely added to skincare products, shampoos, and toothpaste as a humectant and lubricant. In industry, it can be used for lubrication and antistatic treatment in papermaking and textiles, as well as a solvent and plasticizer in coatings and inks. In the agricultural field, it serves as a pesticide emulsifier and spreader, significantly enhancing the wetting and spreading ability of the pesticide solution on plant surfaces.