Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine is a high-performance, oil-soluble organic UV filter providing broad-spectrum protection against both UVA and UVB radiation. Renowned for its exceptional photostability, this ingredient does not degrade under sunlight and effectively stabilizes other less resilient UV filters in a formulation.
- INCI Name:
- Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine
- Chemical/Scientific Name:
- 2,4-Bis{[4-(2-ethylhexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine
- Common Aliases:
- Tinosorb S, Bemotrizinol
| Category: | Sun Protection |
| Source Origin: | Synthetic |
| Comedogenic Rating: | 0 |
| Primary Industries: | Suncare, Anti-Aging Skincare, Color Cosmetics |
| Solubility: | Oil-soluble |
At a Glance: Properties & Effects
| Broad-Spectrum Protection: | |
| Photostability: | |
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| Irritation Risk: |
Primary Benefits:
- Provides comprehensive protection across the entire UV spectrum (280–400 nm).
- Enhances the stability of volatile filters like Butyl Methoxydibenzoylmethane.
- Exhibits negligible skin penetration due to its large molecular size.
- Resists degradation when exposed to intense UV radiation.
Potential Risks:
- Requires oil-based solvents, which may influence the “heaviness” of a cosmetic texture.
- Currently not approved for use in the United States by the FDA (though widely used in the EU, Australia, and Asia).
Biological Action & Cosmetic Profile
This organic filter functions through the absorption of ultraviolet light, converting electromagnetic radiation into harmless heat energy. Its molecular structure contains three triazine rings that allow for two distinct absorption peaks at approximately 310 nm (UVB) and 343 nm (UVA). Unlike older generations of chemical filters, its internal mechanism for energy dissipation is extremely efficient, preventing the molecule from breaking down or creating free radicals during sun exposure.
Molecular weight plays a critical role in the safety profile of this substance. Weighing approximately 627 Daltons, the molecule is significantly larger than the 500-Dalton threshold typically required for skin absorption. Consequently, the filter remains on the surface of the stratum corneum, minimizing systemic exposure and reducing the likelihood of endocrine disruption or internal toxicity often associated with smaller molecules like Benzophenone 3.
Formulation compatibility is a hallmark of this triazine derivative. Because it is highly oil-soluble, it integrates seamlessly into the lipid phase of emulsions. It acts as a photostabilizer for Ethylhexyl Methoxycinnamate and Butyl Methoxydibenzoylmethane, preventing these ingredients from losing their efficacy within minutes of sun exposure. This synergistic effect allows formulators to achieve high SPF and PA ratings with lower total concentrations of active filters.
Broader Applications & Origins
While primarily found in high-SPF sunscreens designed for the European and Asian markets, this ingredient is increasingly utilized in “anti-pollution” and daily-wear moisturizers. Its ability to provide long-lasting UVA protection makes it a critical tool in preventing photoaging, hyperpigmentation, and collagen degradation. Synthetically produced to ensure high purity, it meets the rigorous standards of the European Union’s Cosmetics Regulation (Annex VI).
Routine Integration
Synergies:
- Butyl Methoxydibenzoylmethane: Significantly improves the photostability of this UVA filter.
- Ethylhexyl Triazone: Combines to provide high UVB protection and enhanced water resistance.
- Octocrylene: Works together to broaden the protective shield and improve formula tenacity.
- Titanium Dioxide or Zinc Oxide: Creates a “hybrid” sunscreen system that covers all gaps in the UV spectrum.
Clinical Consensus & Safety
The Scientific Committee on Consumer Safety (SCCS) has evaluated Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine and concluded it is safe for use in cosmetic products at a maximum concentration of 10%. Clinical studies indicate a very low potential for skin sensitization or photo-allergy, making it suitable for individuals with sensitive or reactive skin. Unlike some older filters, it does not exhibit estrogenic activity in vitro or in vivo. Regulatory bodies across the globe, including those in the EU, Australia (TGA), and Japan, have approved its use, citing its excellent safety-to-efficacy ratio.
Is Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine safe for the reef?
Current research suggests that this ingredient has a better environmental profile than filters like oxybenzone. Its large molecular size and low solubility in water mean it is less likely to be bioavailable to marine life, though comprehensive long-term ecological impact studies are ongoing.
Why isn’t this ingredient available in sunscreens in the US?
Although it is used globally, the US FDA classifies sunscreens as over-the-counter drugs rather than cosmetics. The approval process for “new” filters (the Time and Extent Application) has been stalled for decades, meaning many modern, safer filters used in Europe are not yet legal for sale in US-manufactured products.
Does this filter leave a white cast on the skin?
No. As an organic (chemical) filter that is fully dissolved in the oil phase of a formula, it is completely transparent upon application and does not leave the chalky residue often associated with mineral filters like Titanium Dioxide.