As a versatile non-ionic surfactant and emulsifier, this synthetic ether effectively bridges the gap between water and oil phases in a formulation. It is frequently employed in cleansers and lotions to ensure structural stability and provide efficient wetting properties.
- INCI Name:
- C12-14 Sec-Pareth-7
- Chemical/Scientific Name:
- Polyethylene glycol ether of a mixture of synthetic secondary C12-14 alcohols
- Common Aliases:
- Secondary Alcohol Ethoxylate (7 EO), Alcohols C12-14 secondary ethoxylated
| Category: | Surface-Active Substances |
| Source Origin: | Synthetic |
| Comedogenic Rating: | 0 |
| Primary Industries: | Cosmetics, Personal Care, Industrial Cleaning |
| Solubility: | Water-soluble |
At a Glance: Properties & Effects
| Formula Stability | |
| Texture Enhancement | |
| Cleansing Efficacy | |
| Irritation Risk |
- Primary Benefits: Stabilizes complex emulsions, improves rinse-ability of oil-based cleansers, enhances foam quality, and provides superior wetting for uniform application.
- Potential Risks: Minimal risk of skin irritation at standard concentrations; potential for eye irritation if used in high amounts in rinse-off products.
Biological Action & Cosmetic Profile
Functioning primarily as a non-ionic surfactant, this molecule reduces the surface tension of Aqua, allowing it to spread more easily across the skin or hair. The “Sec” in the name indicates a secondary alcohol structure, where the hydrophilic polyethylene glycol chain is attached to a branched carbon backbone. This specific branching often results in faster wetting kinetics and lower pour points compared to linear primary alcohol ethoxylates, making it highly effective for breaking down sebum and environmental pollutants.
Within an emulsion, the amphiphilic nature of the molecule allows it to orient itself at the interface of oil and water droplets. By positioning its lipophilic tail in the oil phase and its hydrophilic head in the water phase, it prevents droplets from coalescing. This action is vital for maintaining the shelf-life and tactile consistency of creams and serums that contain high concentrations of Dimethicone or botanical oils.
Textural improvements are a significant byproduct of its inclusion in a formula. By modulating the viscosity and flow characteristics of a liquid, it helps create a “slip” that consumers perceive as smoothness. In cleansing balms or oil-to-milk formulas, it acts as the primary driver for emulsification upon contact with water, ensuring that no greasy residue remains on the skin surface.
Routine Integration
- Synergies: High compatibility with humectants like Glycerin and fatty alcohols such as Cetearyl Alcohol. It also works effectively alongside Ceteareth 20 to create robust emulsion systems.
- Conflicts: No known biological conflicts with active substances like Retinol or Ascorbic Acid.
Clinical Consensus & Safety
Dermatological safety evaluations by the Cosmetic Ingredient Review (CIR) Expert Panel classify this ingredient under the broad category of Alkyl PEG Ethers. The consensus is that these ethers are safe for use in cosmetics when formulated to be non-irritating to the skin and eyes. Because the manufacturing process involves ethoxylation, reputable suppliers perform rigorous purification to ensure trace levels of 1,4-dioxane remain well below safety thresholds (typically <10 ppm). Clinical data suggests that while the pure raw material can be irritating, typical cosmetic concentrations (0.5% to 5%) exhibit an excellent safety profile with low sensitization potential.
Is C12-14 Sec-Pareth-7 safe for sensitive skin?
Yes, it is considered safe for sensitive skin when used in finished cosmetic products. As a non-ionic surfactant, it is generally milder than anionic surfactants like Sodium Lauryl Sulfate, though people with extremely reactive skin should always patch test new formulations.
Why is this ingredient used in “oil-free” products?
In oil-free formulations, this ingredient serves as a solubilizer or stabilizer for other components, such as fragrances or preservatives, without adding traditional heavy oils. It helps keep the formula clear and homogeneous while maintaining a lightweight feel.
Does it contribute to pore clogging?
It is non-comedogenic. Because it is highly water-soluble and typically used in products designed to be rinsed off or in very low concentrations in leave-on products, it does not trap oil or debris within the pores.