A high-performance hybrid UV filter providing broad-spectrum protection against both UVA and UVB radiation. The molecule acts through a triple-action mechanism by absorbing, scattering, and reflecting light, ensuring exceptional photostability in sun care formulations.
- INCI Name:
- Methylene Bis-Benzotriazolyl Tetramethylbutylphenol
- Chemical/Scientific Name:
- 2,2′-Methylene-bis-(6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol)
- Common Aliases:
- Bisoctrizole, Tinosorb M
| Category: | Sun Protection |
| Source Origin: | Synthetic |
| Comedogenic Rating: | 0 |
| Primary Industries: | Cosmetics, Personal Care, Dermatology |
| Solubility: | Water-dispersible (as a particulate suspension) |
At a Glance: Properties & Effects
| Sun Protection: | |
| Formula Stability: | |
| Irritation Risk: |
- Primary Benefits:
- Provides broad-spectrum coverage (UVA I, UVA II, and UVB).
- Enhances the photostability of other UV filters.
- Offers a high safety profile with minimal skin penetration.
- Does not degrade under direct sunlight.
- Potential Risks:
- May leave a slight white cast on darker skin tones at high concentrations.
- Requires specific emulsification techniques due to its particulate nature.
Biological Action & Cosmetic Profile
The molecule functions as a hybrid filter, bridging the gap between organic (chemical) and inorganic (physical) sunscreens. Unlike traditional chemical filters that only absorb UV light, these microfine organic particles scatter and reflect radiation similar to Titanium Dioxide. Because the particle size is typically around 200 nanometers, it remains on the surface of the stratum corneum rather than penetrating deeper epidermal layers, which significantly reduces the risk of systemic absorption or hormonal interference.Photostability remains one of the most critical advantages of this compound. While some filters, such as Avobenzone, degrade quickly when exposed to photons, this filter retains nearly 100% of its efficacy over time. In a formulation, the particles are often pre-dispersed in Aqua using a surfactant like Decyl Glucoside. This suspension allows for a more uniform distribution on the skin, creating a dense protective lattice that prevents UV-induced DNA damage and photoaging.Clinical evaluations demonstrate that the UV absorption maxima occur at 305 nm and 360 nm. This dual-peak profile ensures that the filter covers the critical wavelength required by regulatory bodies like the SCCS to be classified as broad-spectrum. Furthermore, the inclusion of Glycerin or other humectants in the carrier phase helps mitigate the slight drying effect occasionally associated with particulate sunscreens.
Routine Integration
- Synergies:
- Avobenzone: Exceptional synergy as it stabilizes the notoriously unstable UVA filter.
- Ethylhexyl Triazone: Works together to boost the Sun Protection Factor (SPF).
- Octocrylene: Often used in combination to broaden the UVB protection curve.
- Conflicts:
- None identified; it is chemically inert and compatible with most active substances.
Clinical Consensus & Safety
The Scientific Committee on Consumer Safety (SCCS) and the Cosmetic Ingredient Review (CIR) panel have repeatedly affirmed the safety of this ingredient at concentrations up to 10% in cosmetic products. Because of its large molecular weight and particulate form, dermal absorption is negligible, making it suitable even for sensitive skin types. Research published in peer-reviewed dermatological journals confirms that it is non-sensitizing and non-phototoxic. While it is widely approved in the European Union, Australia, and Asia, it remains under the “Time and Extent Application” (TEA) process with the FDA in the United States, meaning it is not yet available in US-manufactured sunscreens.
Is this a physical or chemical sunscreen?
Technically, it is an organic (chemical) molecule, but it is manufactured as microfine particles that behave like a physical (inorganic) filter by reflecting and scattering light in addition to absorbing it.
Does it cause a white cast?
At concentrations near the 10% limit, a faint white residue may be visible because the particles are large enough to reflect visible light. However, most modern formulations minimize this effect through sophisticated dispersion technologies.
Is it reef-safe?
Current evidence suggests that this filter does not pose the same environmental risks as oxybenzone or octinoxate, as it is not associated with coral bleaching in standard laboratory environmental assessments.