Science
Mechanism of Action
This large-volume, inert molecule functions as a film-former and rheology modifier. It establishes a water-resistant barrier on the skin's surface and, in depilatory applications, provides a high-grip resinous matrix that facilitates the precise mechanical removal of hair from the follicle.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Clinical evaluations of related styrene copolymers at 0.1-2% concentrations in animal models demonstrate a 'slightly irritating' profile, which is the lowest possible descriptive rating, with all effects being fully reversible.
- 02 Due to its high molecular weight and size, the molecule exhibits zero percutaneous absorption, remaining on the skin surface with no evidence of systemic toxicity.
Transparency
Dusting Analysis
As a functional texture and film-forming agent, even low concentrations (0.1%+) contribute to the formula's physical performance; however, it is not an 'active' ingredient typically used for marketing claims, making 'dusting' less of a concern than functional efficacy.
The Formula
Formulation
Stability
Highly stable and inert polymer. It is virtually insoluble in water (1 g/L) and should be incorporated into the oil phase or anhydrous systems.
Synergies
- UV filters
- Hydrocarbon resins
- Emollients
Safety
Safety Profile
The CIR Expert Panel categorized this as safe for cosmetic use, noting its similarity to other styrene copolymers used up to 35% in leave-on products.
Your Skin
Skin Compatibility
Our Assessment
Verdict
An exceptionally safe and inert structural polymer essential for achieving water resistance and mechanical grip in specialized skincare and hair removal products.
Related
Similar Ingredients
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References
Sources