Science
Mechanism of Action
This ingredient functions by intercepting and absorbing UVB radiation at a peak wavelength of 310 nm. It utilizes a triazine structure to maintain stability under light exposure, while its aminopropyltrisiloxane component ensures a uniform, water-resistant film on the skin, converting harmful UV energy into negligible thermal energy.
Research
Clinical Evidence
High confidence10%
Key findings
- 01 SCCS clinical evaluations confirmed that at a 10% concentration, the molecule exhibits negligible percutaneous absorption (below quantification limits), ensuring it remains biologically inert on the skin surface.
Transparency
Dusting Analysis
As a primary UV filter, it is typically used at higher concentrations to meet SPF claims; use below 1% in a product marketed for sun protection would suggest decorative rather than functional inclusion.
The Formula
Formulation
Stability
Highly lipophilic with a Log Pow of 9.4, requiring integration into the oil or silicone phase of an emulsion. Its high molecular weight of 741.12 g/mol prevents it from penetrating the stratum corneum.
Synergies
- Oil-phase antioxidants
- Silicone-based emollients
Conflicts
- Nitrosating agents
- Formaldehyde donors
Safety
Safety Profile
Approved by the SCCS for European markets up to 10%. Currently not listed on the US FDA OTC Sunscreen Monograph, meaning it cannot be used as an active sunscreen ingredient in products sold within the United States.
Your Skin
Skin Compatibility
Our Assessment
Verdict
An exceptionally photostable and safe UVB filter for non-US markets, offering high molecular weight protection with a low risk of skin irritation.
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References
Sources