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METHYLENE BIS-BENZOTRIAZOLYL TETRAMETHYLBUTYLPHENOL.

Valuable CAS 103597-45-1 / LIGHT STABILIZER, UV FILTER

Methylene Bis-Benzotriazolyl Tetramethylbutylphenol, also known as Tinosorb M, is an advanced, broad-spectrum UV filter integral to modern sun protection. This photostable ingredient utilizes a unique hybrid mechanism, offering comprehensive defense against both UVA and UVB radiation. Its microfine particle structure allows for effective reflection and scattering of UV light, alongside traditional absorption.

Summary

sunscreen UV filter photostabilizer

Science

Mechanism of Action

This ingredient functions as a dual-action, hybrid UV filter. It absorbs harmful UV radiation, converting it into harmless heat, with peak absorption at 305 nm for UVB and 360 nm for UVA, covering the 280-400 nm range. Additionally, its microfine particulate form physically reflects and scatters UV light from the skin's surface, providing robust broad-spectrum protection while enhancing the photostability of other sunscreen components.

Research

Clinical Evidence

High confidence
Effective range 10–10%
Optimal

10%

Key findings

  1. 01 The European SCCNFP and SCCS have consistently affirmed its safety and efficacy as a UV filter in cosmetic products at concentrations up to 10%, citing very low skin absorption and no significant evidence of allergenicity, phototoxicity, or irritation on healthy, intact skin.

Transparency

Dusting Analysis

Not commonly dusted

Methylene Bis-Benzotriazolyl Tetramethylbutylphenol is not typically handled as a dry powder due to its inherent insolubility. It is commonly supplied and formulated as a 50% aqueous dispersion of microfine particles (<200 nm), designed for incorporation into the water phase of emulsions.

The Formula

Formulation

Solubility
Unknown
Optimal pH 10.5 – 12
0 7 14

Stability

This ingredient is inherently neither water nor oil soluble, being extremely hydrophobic with very low water solubility (< 5 ng/L). It is typically supplied as a 50% aqueous dispersion (e.g., Tinosorb M), which can be post-added to the water phase of emulsions and is suitable for cold process formulations. It is highly photostable and notably enhances the stability of other UV filters in a formulation. It exhibits compatibility with most cosmetic ingredients.

Synergies

  • Enhances the stability of other UV filters.

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
10%
Sensitization risk Low

European regulatory bodies (SCCNFP, SCCS) consider Methylene Bis-Benzotriazolyl Tetramethylbutylphenol safe for cosmetic use up to 10%, demonstrating very low dermal absorption. However, the FDA has not yet reviewed it for sunscreen drug products in the US. Isolated cases of contact allergy have been reported, particularly in individuals with pre-existing sensitivities like ketoprofen or decyl glucoside allergies, or in children with sensitive skin. The SCCS has also expressed concerns regarding potential bioaccumulation and environmental impact due to its high lipophilicity and poor biodegradation.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

Methylene Bis-Benzotriazolyl Tetramethylbutylphenol is a highly valuable, broad-spectrum, and photostable UV filter offering dual protection through absorption and reflection, making it ideal for comprehensive daily sun protection formulations.

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