According to the technical data of Guoli Chemical, the core difference between castor oil polyoxyethylene ether EL-80 and EL-90 lies in the **different ethylene oxide (EO) addition numbers**, which directly leads to differences in their **hydrophilicity, unsaturation, and chemical stability**, thus determining their respective application focuses.
Although they appear similar in parameters such as HLB value (16-17) and cloud point (91-96°C), the differences in internal molecular structure affect specific performance. Simply put, **EL-90 has stronger hydrophilicity, lower unsaturation, and better chemical stability; while EL-80 is more common in emulsification dispersion and formulation adaptability for specific systems.**
### Detailed Technical Parameter Comparison
To more clearly demonstrate the differences between the two, the following is a comparison of key parameters based on the Guoli Chemical database:
| Technical Parameter | Castor Oil Polyoxyethylene Ether EL-80 | Castor Oil Polyoxyethylene Ether EL-90 |
| :--- | :--- | :--- |
| **Molecular Formula** | C₅₇H₁₀₄O₉(C₂H₄O)₈₀H | C₅₇H₁₀₄O₉(C₂H₄O)₉₀H |
| **Molecular Weight** | Approximately 4450 | Approximately 4900 |
| **Iodine Value (gI₂/100g)** | ≤ 20 | **≤ 2.0** |
| **Surface Tension (1% aqueous solution, 25°C)** | Approximately 35~40 mN/m | Approximately 40.0 mN/m |
| **Penetration (1% aqueous solution)** | General | **> 300 seconds (canvas sinking method)** |
| **Chemical Stability** | Stable to acid, alkali, and hard water, **general oxidation resistance** | Stable to acid, alkali, hard water, and **oxidizing agents** |
| **Critical Micelle Concentration (CMC)** | Approximately 0.01~0.1% | 0.01~0.02 g/L |
| **Appearance** | Light yellow to brownish yellow transparent liquid (or paste) | Light yellow to yellow |
### Core Difference Interpretation and Application Suggestions
According to the table above, the main differences between the two products lie in **iodine value** and **chemical stability**, which are the key factors for your selection.
#### 1. Castor Oil Polyoxyethylene Ether EL-80: Widely Applicable, More Flexible Formulation
- **Characteristics**: Relatively high iodine value (≤20), indicating that its molecular structure retains more unsaturated double bonds from natural castor oil. This makes its hydrophilic-lipophilic balance more flexible and potentially offers wider compatibility with various oil phases.
- **Advantageous Application Scenarios**:
- **Pesticide Emulsifier**: In complex emulsifiable concentrate systems such as pyrethroids, organophosphates, and emamectin benzoate, EL-80 acts as an efficient emulsifier, providing excellent initial emulsification and long-term stability.
- **Textile and Chemical Fiber Oil Agent**: Effectively reduces the dynamic friction coefficient of fibers, eliminates static electricity, reduces fluff and broken ends, and imparts a soft hand feel to yarns.
- **Daily Chemical Solubilizer**: Has outstanding solubilizing capacity for fragrances, plant essential oils, and oil-soluble active ingredients, suitable for formulating low-viscosity transparent products.
- **Emulsion Polymerization**: As an emulsifier and colloidal protector, it effectively controls the particle size distribution of latex particles in systems such as acrylates and styrene-acrylics, improving the mechanical stability of the emulsion.
#### 2. Castor Oil Polyoxyethylene Ether EL-90: Excellent Chemical Stability, More Stable Performance
- **Characteristics**: Extremely low iodine value (≤2.0), meaning most unsaturated double bonds have been deeply saturated. This gives it **outstanding oxidation resistance and chemical stability**, making it more stable under harsh conditions, and its surface tension (40 mN/m) and CMC value are lower.
- **Advantageous Application Scenarios**:
- **Metalworking Fluids**: In working environments such as cutting fluids and grinding fluids that may come into contact with oxidizing agents or high temperatures, the chemical stability of EL-90 ensures lasting and reliable formulation performance.
- **Powerful Industrial Cleaning**: In cleaning formulations containing oxidizing components, EL-90 maintains structural stability and continuously performs cleaning and dispersing functions.
- **Emulsion Systems Requiring High Stability**: For any formulation that needs to withstand oxidation, long shelf life, or harsh chemical environments, EL-90 is the better choice.
### Selection Guide Summary
| Selection Basis | Recommended Product | Reason |
| :--- | :--- | :--- |
| **Seeking general applicability and formulation compatibility** | **EL-80** | Retains natural structural features, strong compatibility with various oils, solvents, and additives through compounding, is a conventional choice for many industrial formulations. |
| **Formulation needs to come into contact with oxidizing substances** | **EL-90** | Extremely low iodine value ensures it is not easily oxidized, maintaining the lasting stability and performance of the formulation. |
| **Requiring ultimate chemical stability** | **EL-90** | Good stability to hard water, acids, alkalis, and oxidants, suitable for long-term or harsh condition applications. |
| **Used in metalworking fluids or systems with oxidation risk** | **EL-90** | Prevents formulation failure or workpiece corrosion risks caused by oxidative decomposition. |
**Operational Suggestion**: The recommended dosage range for both products is similar, e.g., 2%~10% of the oil phase weight as an emulsifier. When selecting a formulation, it is recommended to first conduct small-scale validation tests with a small amount of sample. Compare EL-80 and EL-90 in your target formulation to observe their emulsification effect, stability, and long-term storage behavior, thereby determining the most suitable product for your needs.
