Science
Mechanism of Action
Operating as a functional silicone, Silicone Quaternium-18 deposits a protective, vapor-permeable film upon application. This film contributes to skin conditioning by minimizing transepidermal water loss and imparts emollient properties, resulting in a notably softer and smoother skin texture.
Research
Clinical Evidence
Medium confidence1%
Key findings
- 01 A clinical evaluation demonstrated that shampoos containing 1%w/w silicone quaternary microemulsion delivered the highest conditioning performance, specifically enhancing hair smoothness and softness.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
This ingredient exhibits optimal stability within a pH range of 6.59 to 7.17, consistent with stable shampoo formulations. Its ethoxylated nature facilitates more even deposition compared to non-ethoxylated amodimethicones. Due to its higher cost, it is frequently utilized as a specialized additive rather than a primary conditioning agent, typically at lower concentrations.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that Quaternium-18 and its related compounds are safe for use in cosmetic formulations. The maximum reported concentration of use for a related compound, Quaternium-18 Bentonite, in leave-on products was 9%. Generally, silicones are regarded as non-irritating, non-sensitizing, and hypoallergenic.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Silicone Quaternium-18 is a valuable silicone for enhancing skin and hair conditioning through protective, vapor-permeable film formation, recognized for its low irritancy and broad skin compatibility.
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