Ceteth-3 is a non-ionic surfactant and emulsifying agent that stabilizes the mixture of oil and water in cosmetic formulations. By reducing interfacial tension, this ethoxylated alcohol ensures a uniform consistency and improves the spreadability of creams and lotions.
- INCI Name:
- Ceteth-3
- Chemical/Scientific Name:
- Polyethylene glycol (3) cetyl ether
- Common Aliases:
- PEG-3 Cetyl Ether, Polyoxyethylene (3) Cetyl Ether
| Category: | Emulsifiers |
| Source Origin: | Synthetic (derived from ethoxylated cetyl alcohol) |
| Comedogenic Rating: | 2-3 |
| Primary Industries: | Skincare, Haircare, Sun Protection |
| Solubility: | Oil-soluble |
At a Glance: Properties & Effects
| Texture Enhancement: | |
| Formula Stability: | |
| Irritation Risk: | |
| Comedogenicity: |
Primary Benefits:
- Prevents phase separation in emulsions
- Creates a smooth, non-greasy skin feel
- Enhances the distribution of active ingredients
- Provides lightweight emolliency
Potential Risks:
- Moderate potential to clog pores in acne-prone individuals
- May cause mild irritation on compromised skin barriers
Biological Action & Cosmetic Profile
Low-HLB surfactants like this one function by adsorbing at the oil-water interface. The molecule features a lipophilic Cetyl Alcohol chain and a short hydrophilic chain composed of three ethylene oxide units. Because the HLB value falls within the 6-8 range, the ingredient is predominantly lipophilic, making it an ideal candidate for water-in-oil (W/O) systems or as a secondary co-emulsifier in oil-in-water (O/W) emulsions.
Formulators rely on these polyoxyethylene ethers to prevent phase separation. By forming a protective film around oil droplets, the substance inhibits coalescence, thereby extending the shelf life of complex dermatological products. Unlike high-HLB detergents that strip surface lipids, this shorter-chain PEG ether maintains a softer profile, often appearing in products designed for sensitive skin that require high stability without the use of harsh foaming agents.
Broader Applications & Origins
Ethoxylation technology allows for the precise modification of fatty alcohols to achieve specific functional traits. Most production involves reacting Cetyl Alcohol with ethylene oxide. While the starting fatty alcohol can be plant-derived, the final material is technically a synthetic derivative due to the chemical processing required to attach the glycol chains. Beyond moisturizing creams, it is frequently utilized in hair conditioners to assist in the even dispersion of softeners and oils.
Routine Integration
Synergies:
- Cetyl Alcohol: Works in tandem to thicken the oil phase and stabilize the base.
- Glycerin: Helps maintain hydration in the water phase of the emulsion.
- Stearic Acid: Often combined to create structured, pearlized cream textures.
- Aqua: Serves as the primary solvent that this ingredient helps emulsify with oils.
Conflicts:
- This substance is chemically stable and does not interfere with the efficacy of actives like Retinol or Ascorbic Acid.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) Expert Panel has evaluated the Ceteth series and concluded they are safe for use in cosmetics when formulated to be non-irritating. Research indicates that while ethoxylated alcohols can enhance the penetration of other ingredients, they do not exhibit systemic toxicity at standard cosmetic concentrations. Dermatological safety assessments prioritize the purity of the ingredient, ensuring that manufacturing by-products like 1,4-dioxane are removed. Individuals with highly reactive or acne-prone skin should monitor their response, as a comedogenic rating of 3 suggests a moderate risk for pore blockage in specific individuals.
Is Ceteth-3 vegan?
The source of the starting material determines the vegan status. Most modern suppliers use vegetable-derived fatty alcohols, making the ingredient suitable for vegan formulations, though it remains a synthetic derivative due to the ethoxylation process.
Does this ingredient cause acne?
With a comedogenic rating between 2 and 3, it has a mild to moderate potential to clog pores. It is generally safe for normal to dry skin types but may contribute to breakouts in those with oily or highly congestion-prone skin.
Is it safe for use around the eyes?
Dermatological evaluations show that the Ceteth group is non-sensitizing and safe for use in eye area products, provided the final formulation is tested for ocular compatibility and pH balance.