Castor Oil Polyoxyethylene Ether EL-90, as a nonionic surfactant, has stable physicochemical properties, but during use, the following typical problems may arise due to operating conditions, storage environment, or formulation compatibility:
1. Product solidification or cloudiness: The melting point of EL-90 is 35~40°C. Under low-temperature environments, the product will naturally solidify or become cloudy. This is a normal physical change and does not affect product quality. The solution is to use indirect heating (such as a warm water bath, temperature not exceeding 40°C) to slowly melt and stir evenly before normal use. Do not use open flames to directly heat the container to avoid local overheating that may cause product decomposition.
2. Unsatisfactory emulsification effect or emulsion layering: Possible reasons include: mismatch of HLB value (HLB value of EL-90 is 16-17) with the oil phase, need to optimize emulsification process parameters (temperature, shear speed, addition sequence), or high water hardness. It is recommended to check whether the required HLB value of the oil phase in the formulation matches EL-90, adjust the emulsification temperature to a suitable range, and ensure adequate shear homogenization.
3. Slow dissolution or uneven dispersion: EL-90 is a paste or viscous liquid at room temperature, with a viscosity of 2000~3000 mm²/s (25°C). It is recommended to slowly add it to warm water (30~50°C) under stirring to dissolve, or pre-disperse it with a small amount of organic solvent such as ethanol or acetone before adding to the aqueous phase, which can effectively speed up dissolution.
4. Darkening of product color or off-odor: This may be caused by storage temperature exceeding 40°C, prolonged exposure to air or direct sunlight, or contact with incompatible substances (strong acids, strong bases, strong oxidizers). Immediately check the storage environment to ensure the product is sealed and stored in a cool, dry place at 5~40°C, away from light.
| Contact type | Measures |
|---|---|
| Skin contact | Immediately remove contaminated clothing, thoroughly rinse the affected area with plenty of running water and mild soap. If irritation persists, seek medical advice. |
| Eye contact | Immediately open eyelids and rinse slowly with plenty of running water or normal saline for at least 15 minutes, rolling eyes to ensure thorough rinsing. Remove contact lenses if worn. If irritation persists, seek medical attention immediately. |
| Inhalation | Quickly move the patient to fresh air, loosen tight clothing, and maintain an open airway. If breathing difficulty or persistent symptoms occur, seek medical attention immediately. |
| Ingestion | If the patient is conscious, rinse mouth with water several times, slowly administer about 200 mL of water to dilute stomach contents. Do not induce vomiting. Seek medical attention immediately and present product label or safety instructions. |
When handling spills, wear nitrile gloves and chemical safety goggles. Immediately use inert materials such as sand or vermiculite to build containment dikes to control spread, and prevent leakage from entering drainage systems or water bodies. For liquid spills, absorb completely with activated clay or universal absorbent pads, then place in a sealed compatible container for professional disposal. Also collect any wash water and dispose of it in compliance with local regulations by a qualified professional waste disposal company.
If the above solutions do not resolve the issue, or if you encounter in-depth technical problems such as formulation development or process optimization, it is recommended to obtain professional support through the following channels: