Science
Mechanism of Action
By attaching long-chain alkyl groups (C16-C18) to a silicone backbone, this ingredient functions as a semi-occlusive film former. It modifies the surface tension of the skin to reduce Transepidermal Water Loss (TEWL) while simultaneously improving formula spreadability and neutralizing the heavy or greasy sensation often associated with organic oils.
Research
Clinical Evidence
High confidence17%
Key findings
- 01 Concentrations between 4% and 25% in alkyl-modified silicone systems demonstrated a significant decrease in TEWL, sustaining skin hydration levels for up to 5 hours post-application.
- 02 In vivo testing at 17% concentration confirmed superior shear-thinning behavior, which optimizes the sensory profile of anti-aging and UV-protection products by removing tackiness.
Transparency
Dusting Analysis
While often used at lower levels for simple slip, clinical hydration benefits require at least 4%. Concentrations below 1% in moisturizers likely indicate it is being used as a processing aid rather than an active barrier-repair agent.
The Formula
Formulation
Stability
Highly chemically inert and thermally stable; it functions as an oil-phase thickener and prevents droplet coalescence in complex emulsions.
Synergies
- Titanium Dioxide
- Zinc Oxide
- Vegetable Oils
- Dimethicone Crosspolymers
Conflicts
- Strong oxidizing agents
- Polar aqueous systems without adequate emulsification
Safety
Safety Profile
Last re-evaluated by the CIR in 2019. To meet rigorous safety standards, residual cyclosiloxanes (D4/D5) are monitored to remain below 0.1%.
Your Skin
Skin Compatibility
Our Assessment
Verdict
An exceptional texture-refining emollient for dry and sensitive skin, though its high comedogenicity rating requires caution for acne-prone individuals.
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References
Sources