According to the technical data from Guoli Chemical, the core advantages of Castor Oil Polyoxyethylene Ether EL-90 lie in its **excellent hydrophilic emulsification ability due to high HLB value, outstanding chemical stability and broad compatibility, as well as remarkable environmental and safety characteristics**.
As a nonionic castor oil derivative with a high ethylene oxide (EO) addition number, EL-90 exhibits differentiated advantages in multiple key performance aspects compared to low-EO products (such as EL-20, EL-40) and other types of emulsifiers.
### Detailed Core Advantages
1. **Superior Hydrophilic Emulsification and Solubilization Capacity**
* **High HLB Value**: EL-90 has an HLB value as high as **16-17**, making it a typical O/W (oil-in-water) emulsifier that can easily emulsify various oil phases, fragrances, and active ingredients into a stable, fine aqueous system.
* **Efficient Solubilization**: Thanks to its long EO chain, it has a significant solubilizing effect on poorly soluble substances, greatly improving the transparency and long-term stability of formulations, which is difficult for low-EO products and many ionic surfactants to achieve.
2. **Excellent Water Solubility and Broad Compatibility**
* **Fully Water Soluble**: EL-90 is easily soluble in water, forming a clear and transparent solution, making it very convenient to use.
* **Outstanding Chemical Stability**: It exhibits excellent tolerance to acids, alkalis, hard water, and electrolytes. It maintains stable performance in complex or extreme formulation systems (such as strong alkaline cleaners and high-salt metalworking fluids) without delamination or failure, which is one of its core advantages.
3. **Environmentally Friendly and Mildly Safe**
* **Green Attribute**: The product is readily biodegradable with very low bioaccumulation potential, meeting the high environmental requirements of modern industry.
* **High Safety**: It has extremely low acute oral toxicity (LD50 > 5,000 mg/kg), is non-irritating to the skin, and causes only slight reversible irritation to the eyes. It is not classified as a dangerous chemical. This makes it very suitable for personal care and household cleaning products.
4. **Multi-functionality and Emulsion Stability**
EL-90 is not just a simple emulsifier; it integrates functions of emulsification, dispersion, stabilization, and wetting. It can effectively reduce interfacial tension, obtain stable emulsions with narrow particle size distribution, and reduce the synergistic need for multiple auxiliaries in the formulation.
### Core Technical Parameter Comparison (Based on Guoli Chemical Database)
The following data intuitively shows how the characteristics of EL-90 translate into application advantages:
| Technical Parameter | EL-90 Typical Value | Advantage Interpretation |
| :--- | :--- | :--- |
| **Ionic Type** | Nonionic | Can be compounded with anionic, cationic, and nonionic auxiliaries, offering extremely broad formulation adaptability. |
| **HLB Value** | 16-17 | **Efficient O/W emulsification**, especially suitable for difficult-to-emulsify light mineral oils and synthetic esters. |
| **Cloud Point (1% aqueous solution)** | 91.0 ~ 96.0 ℃ | **Very high cloud point**, indicating it maintains excellent dissolution and emulsification abilities in high-temperature processes (e.g., high-temperature dyeing, hot cleaning). |
| **Active Content** | ≥ 99% | High purity with low moisture content (≤1.0%), ensuring the most effective emulsification. |
| **pH Value (1% aqueous solution)** | 5.5 ~ 7.5 | Nearly neutral, mild and non-irritating, friendly to sensitive substrates (e.g., human skin, fine fabrics). |
| **Foam Characteristics** | Low foam | Suitable for industrial operations requiring low foam, such as high-speed spinning oil agents and metal cutting fluids, reducing the need for defoamers. |
### Application Recommendations
Based on the above advantages, EL-90 is particularly suitable for the following high-demand fields:
* **Cosmetics**: As a mild emulsifier and solubilizer for creams, lotions, cleansing oils, and body washes, providing a light and non-greasy skin feel.
* **Pesticide Formulations**: As an emulsifier for efficient emulsion in water (EW) and microemulsion (ME) formulations, especially for export preparations with high environmental requirements.
* **Textile and Chemical Fiber**: As a core component of high-temperature leveling agents and high-performance chemical fiber oil agents, leveraging its high cloud point and strong stability.
* **Metalworking Fluids**: As the main emulsifier and lubricant in fully synthetic and semi-synthetic cutting fluids, resistant to hard water and spoilage.
### Precautions
* **Solidification Handling**: This product has a melting point between **35~40℃** and will solidify into a paste at low temperatures. Before use, it should be **indirectly heated and melted in a warm water bath and stirred evenly**. No open flame heating is allowed. This is a normal physical phenomenon and does not affect product quality.
* **Combination Use**: To achieve optimal emulsion stability, it is often used in combination with low-HLB emulsifiers (such as EL-10, S-80).
