Ethoxylated Hydrogenated Castor Oil (HEL-40), widely recognized by its INCI designation **PEG-40 Hydrogenated Castor Oil**, is a high-performance non-ionic surfactant and emulsifier. It is synthesized through the controlled ethoxylation of hydrogenated castor oil, where the “40” denotes the average molar addition of ethylene oxide. This chemical process transforms the naturally hydrophobic castor oil into a versatile, water-soluble amphiphilic agent.
A primary advantage of the hydrogenated version over standard ethoxylated castor oil is its superior oxidative stability; the saturation of the fatty acid chains prevents rancidity and ensures a longer shelf life for finished formulations. HEL-40 is prized for its ability to solubilize lipophilic substances—such as essential oils, fragrances, and oil-soluble vitamins—into clear aqueous systems. Due to its mild toxicological profile and high compatibility with various surfactant classes, it is a foundational component in the cosmetic, pharmaceutical, and detergent industries, offering a balance of functional efficiency and dermatological safety.
**Exceptional Solubilizing Power:** Efficiently incorporates essential oils, fragrances, and lipophilic actives into water-based systems, maintaining perfect clarity.
**High Oxidative Stability:** The hydrogenated backbone resists oxidation, preventing color changes and unpleasant odors in the final product.
**Dermatological Mildness:** Low irritation potential makes it ideal for sensitive skin, oral care, and mucous membrane applications.
**Non-Ionic Nature:** Exhibits excellent compatibility with anionic, cationic, and other non-ionic surfactants, as well as high concentrations of electrolytes.
**Emollient Properties:** Acts as a superfatting agent, leaving a smooth, non-greasy film on the skin and hair.
**Texture Enhancement:** Improves the viscosity and sensory profile of liquid formulations.
**CAS Number:** 61788-85-0.
**HLB Value:** Approximately 14.0–16.0, classifying it as a potent O/W (oil-in-water) emulsifier and solubilizer.
**Physical State:** White to pale yellow paste or waxy solid at 25°C; liquefies upon gentle heating (melting point ~30°C).
**Solubility:** Completely soluble in water, ethanol, and isopropanol; insoluble in mineral oil.
**Saponification Value:** Typically 45–65 mg KOH/g.
**Hydroxyl Value:** Ranges between 60–80 mg KOH/g.
**Acid Value:** ≤ 1.0 mg KOH/g, ensuring minimal reactivity with other ingredients.
**Stability:** Stable across a wide pH range (typically 5.0–8.0 in a 10% aqueous solution).
• Electrical and electronics
• Connectors, switches, PCB housings, terminal blocks
• Automotive
• Under-hood components, interior assemblies, cable conduits
• Wire and cable
• Insulation layers, sheathing, jacketing materials
• Construction
• Plastic fittings, conduits, insulation panels
• Consumer appliances
• Enclosures, adapters, plugs, casings
• Industrial components
• Fiber-reinforced composites, flame-retardant masterbatches
• Compatible polymers
• PA6, PA66
• PBT, PET
• PE, PP
• Blends and copolymers requiring halogen-free flame retardancy
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