This specialized silicone emulsifier is designed to stabilize complex water-in-oil and water-in-silicone formulations. It provides a lightweight, silky texture and enables the incorporation of high pigment or mineral sunscreen loads without a greasy residue.
- INCI Name:
- Lauryl PEG-10 Tris(trimethylsiloxy)silylethyl Dimethicone
- Chemical/Scientific Name:
- Siloxanes and Silicones, lauryl Me, Me 2-(trimethoxysilyl)ethyl, Me, poly(oxy-1,2-ethanediyl) alpha-Me omega-(2-propenyloxy) ether-substituted
- Common Aliases:
- Branched polyether-modified silicone, KF-6038
| Category: | Emulsifiers |
| Source Origin: | Synthetic |
| Comedogenic Rating: | 0 |
| Primary Industries: | Skincare, Color Cosmetics, Sun Care |
| Solubility: | Oil and Silicone Dispersible |
At a Glance: Properties & Effects
| Texture Enhancement: | |
| Formula Stability: | |
| Irritation Risk: |
Primary Benefits:
- Ensures the stability of emulsions containing high levels of salts or electrolytes.
- Creates a smooth, non-tacky skin feel even in heavy creams.
- Improves the spreadability of mineral UV filters like Zinc Oxide.
- Facilitates the creation of “Quick-Break” emulsions that release water upon application.
Potential Risks:
- Negligible risk of irritation; generally considered inert on the skin surface.
Biological Action & Cosmetic Profile
The molecular architecture of this ingredient allows it to bridge the gap between incompatible liquid phases. Its structure features a Dimethicone backbone modified with three distinct functional groups: a lauryl alkyl chain for oil compatibility, a PEG-10 polyether chain for water affinity, and a tris(trimethylsiloxy)silylethyl group for high silicone solubility. This branched configuration creates a more robust interfacial film around water droplets than linear emulsifiers, effectively preventing coalescence in water-in-oil (W/O) systems.Dermatological performance is characterized by an “elegant” skin feel. While traditional W/O emulsifiers can feel heavy or “draggy,” this branched silicone surfactant allows for the formulation of high-internal-phase emulsions that feel surprisingly light. By lowering the surface tension between phases, it ensures that active ingredients like Glycerin or water-soluble vitamins remain evenly suspended throughout the product’s shelf life.
Broader Applications & Origins
Beyond standard moisturizing lotions, this material is a cornerstone of modern fluid foundations and high-SPF sunscreens. The inclusion of the lauryl group is significant because it grants the molecule compatibility with “natural” organic oils and triglycerides, a feat many standard silicone emulsifiers struggle to achieve. Manufacturers often utilize it to stabilize dispersions of Titanium Dioxide, preventing the clumping (agglomeration) that leads to white casts and uneven protection.Synthetic synthesis is required to achieve this specific branched structure. Through a process called hydrosilylation, various side chains are grafted onto a siloxane polymer. The result is a multifunctional fluid that can emulsify a wide range of oils, from volatile Cyclopentasiloxane to heavy vegetable oils, without requiring high-heat processing.
Routine Integration
Synergies:
- Physical Sunscreens: Enhances the dispersion and UV-shielding uniformity of Zinc Oxide and Titanium Dioxide.
- Electrolytes: Works exceptionally well in formulas containing Magnesium Sulfate, which helps stabilize the internal water phase.
- Volatile Silicones: Pairs with Cyclopentasiloxane to create long-wearing, transfer-resistant makeup.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) Expert Panel has evaluated polyether-modified siloxanes and concluded they are safe for use in cosmetic practices. Because of its high molecular weight, Lauryl PEG-10 Tris(trimethylsiloxy)silylethyl Dimethicone does not penetrate the stratum corneum, remaining on the surface to provide conditioning and barrier support. It is non-sensitizing and non-comedogenic, making it suitable for patients with sensitive or acne-prone skin who require the occlusive benefits of a water-in-oil cream without the heaviness of petrolatum.
Is this ingredient a “plastic” or microplastic?
No, this is a liquid silicone polymer, not a solid plastic particle. It does not fall under the ECHA restrictions regarding microplastics as it functions as a fluid surfactant and film-former.
Does it cause breakouts?
Silicones of this type are chemically inert and too large to clog pores. While the overall “heaviness” of a water-in-oil emulsion might not suit extremely oily skin types, the ingredient itself has a comedogenic rating of 0.
Why is it used in “waterproof” products?
As a water-in-oil emulsifier, it places the oil/silicone phase on the outside of the emulsion. This creates a hydrophobic barrier on the skin that resists being washed away by sweat or rain.