Tween T-20 Coconut Fatty Acid (chemical name: Polyoxyethylene (20) sorbitan monococoate) is one of the core products of Guoli Chemical. The database shows its hydrophilic-lipophilic balance (HLB) value is as high as 16.7, indicating strong hydrophilicity and excellent performance as an oil-in-water (O/W) emulsifier and efficient solubilizer. Its low acid value (≤2 mg KOH/g) and extremely low iodine value (≤2) indicate high purity, very few unsaturated bonds in the molecular structure, and excellent oxidation resistance and chemical inertness in formulations.
In terms of physical form and surface activity, this product has a kinematic viscosity of approximately 400 mm²/s (25°C), density of about 1.10 g/cm³, and slight hygroscopicity. Its 1% aqueous solution can reduce surface tension to about 37 mN/m, and its critical micelle concentration (CMC) is as low as about 6×10⁻⁵ mol/L, ensuring effective wetting, spreading, and solubilization at very low addition levels. It is easily soluble in water, methanol, ethanol, and other polar solvents. The pH of a 1% aqueous solution is between 5.0 and 7.0, making it very mild.
According to the strictly monitored heavy metal limit indicators (Pb≤10 mg/kg, As≤2 mg/kg) in the Guoli Chemical database, this product has high purity. Whether used as a cosmetic-grade or industrial-grade green auxiliary, its composition distribution with no unsaturated bonds, low free alcohols (≤1%), and high monoester content (≥90%) gives formulation engineers great confidence in process stability and safety.
| Indicator | Specification/Parameter | Remarks |
|---|---|---|
| Chemical Name | Polyoxyethylene (20) sorbitan monococoate | Also known as Tween 20 / Polysorbate 20 |
| CAS Number | 9005-64-5 | |
| Molecular Formula/Weight | C58H114O26 / ~1228 | |
| Appearance | Light yellow to amber viscous liquid | |
| Ionic Type | Non-ionic | |
| Active Content | ≥ 97% | |
| HLB Value (Hydrophilic-Lipophilic Balance) | 16.7 | High hydrophilicity |
| pH Value (1% / 5% Aqueous Solution) | 5.0 - 7.0 | Good mildness |
| Cloud Point (1% Aqueous Solution) | > 100°C | High temperature resistance without separation |
| Density (25°C) | ~1.10 g/cm³ | |
| Kinematic Viscosity (25°C) | ~400 mm²/s | |
| Refractive Index | 1.468 - 1.472 | |
| Acid Value | ≤ 2 mg KOH/g | Very low free acid content |
| Iodine Value | ≤ 2 | Strong oxidation resistance |
| Saponification Value | 40 - 50 mg KOH/g | |
| Hydroxyl Value | 95 - 110 mg KOH/g | |
| Moisture | ≤ 3.0% | |
| Surface Tension (1% Aqueous Solution, 25°C) | ~37 mN/m | Good wetting and spreading properties |