C12-15 Pareth-3 functions primarily as an emulsifying agent and surfactant that stabilizes oil-in-water formulations. It facilitates the blending of immiscible liquids, ensuring cosmetic products maintain a uniform consistency and rinse effectively from the skin or hair.
- INCI Name:
- C12-15 Pareth-3
- Chemical/Scientific Name:
- Polyethylene glycol ether of mixed synthetic C12-15 fatty alcohols
- Common Aliases:
- PEG-3 C12-15 Alkyl Ether, Polyoxyethylene (3) C12-15 Alcohols
| Category: | Emulsifiers |
| Source Origin: | Synthetic |
| Comedogenic Rating: | 0 |
| Primary Industries: | Cosmetics, Personal Care, Industrial Cleaning |
| Solubility: | Oil-soluble, dispersible in water |
At a Glance: Properties & Effects
| Formula Stability: | |
| Texture Enhancement: | |
| Irritation Risk: |
- Primary Benefits:
- Improves product spreadability and skin feel.
- Prevents phase separation in complex emulsions.
- Assists in the solubilization of fragrance oils and actives.
- Potential Risks:
- Potential for trace 1,4-dioxane contamination if not properly purified.
- Mild irritation possible in individuals with compromised barriers at high concentrations.
Biological Action & Cosmetic Profile
The molecular architecture of this ingredient consists of a hydrophobic carbon chain derived from C12-15 fatty alcohols joined to three units of ethylene oxide. Because it possesses a relatively low degree of ethoxylation, it exhibits a lower Hydrophilic-Lipophilic Balance (HLB) value compared to higher “Pareth” numbers. This characteristic makes it particularly effective as a co-emulsifier for water-in-oil systems or as a spreading agent in anhydrous formulations.By reducing the interfacial tension between the oil and water phases, the molecule allows for the creation of smaller, more stable droplets. These droplets remain suspended throughout the shelf life of the product, preventing the “creaming” or separation often seen in poorly formulated creams. Furthermore, its surfactant properties allow it to interact with skin lipids, momentarily increasing the permeability of the stratum corneum to assist the delivery of other active ingredients.
Broader Applications & Origins
Manufacturers frequently select this synthetic ether for its stability across a wide pH range and its compatibility with various electrolyte concentrations. While its primary role is in skincare, it is also a staple in hair care chemistry, where it aids in the distribution of conditioning agents. The use of a synthetic feedstock ensures a consistent carbon chain distribution, which provides more predictable viscosity and performance than some naturally derived alternatives.
Routine Integration
- Synergies:
- Works efficiently alongside C12 15 Alkyl Benzoate to create lightweight, non-greasy textures.
- Enhances the stability of formulas containing Dimethicone and other silicones.
- Combines well with humectants like Glycerin and Aqua to form smooth, pearlescent lotions.
- Often paired with Cetearyl Alcohol to build viscosity in creams.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) Expert Panel has evaluated the Alkyl PEG ethers group, which includes this specific compound, and concluded they are safe for use in cosmetic products. Safety is predicated on the formulation being non-irritating, as surfactants can occasionally cause mild localized reactions at high concentrations. To meet regulatory standards in the EU (CosIng) and North America, manufacturers must ensure that the ethoxylation process is controlled to keep trace byproducts like 1,4-dioxane within safe, negligible limits. Modern purification techniques have largely mitigated these concerns, making the ingredient a standard choice for high-quality cosmetic manufacturing.
Is C12-15 Pareth-3 a silicone?
No, it is a synthetic fatty alcohol ether and does not belong to the silicone family, although it is often used in formulas that contain silicones to help stabilize them.
Does this ingredient cause acne?
Current dermatological data indicates a comedogenic rating of 0, meaning it is unlikely to clog pores or trigger acne when used in typical cosmetic concentrations.
Is it considered a “natural” ingredient?
This ingredient is synthetic. While the fatty alcohol portion can theoretically be derived from plant oils, the ethoxylation process that creates the “Pareth” structure is a chemical synthesis.