Chemical Name: Bisoctrizole
Chemical Synonyms: UV-360; Tinosorb M; Methylene Bis-Benzotriazolyl Tetramethylbutylphenol; Milestab-360
CAS No.: 103597-45-1
Molecular Formula: C₄₁H₅₀N₆O₂
Molecular Weight: 658.87 g/mol
Bisoctrizole (CAS 103597-45-1), also known as UV-360 or Tinosorb M, is a benzotriazole-based UV absorber with broad-spectrum absorption across the UVA and UVB range (300–400 nm). It is used both as a cosmetic UV filter in sun care formulations (EU and Asian markets) and as a polymer light stabilizer in industrial applications including coatings, plastics, and films. With assay ≥99% and excellent photostability, it provides reliable UV protection in both personal care and material protection systems.
Parameter | Specification |
|---|---|
Product Name | Bisoctrizole |
Synonyms | UV-360; Tinosorb M; Methylene Bis-Benzotriazolyl Tetramethylbutylphenol; Milestab-360 |
CAS Number | 103597-45-1 |
Molecular Formula | C₄₁H₅₀N₆O₂ |
Molecular Weight | 658.87 g/mol |
EINECS No. | 403-800-1 |
Assay / Purity | ≥99% |
Appearance | White to light yellow crystalline powder |
Melting Point | 195–199 °C |
Absorption Range | 300–400 nm (UVA/UVB) |
Storage | Cool, dry place, protected from light and moisture |
Sun Care Formulations: Broad-spectrum UV protection in sunscreens, daily moisturizers with SPF, and after-sun products.
Photostabilization: Stabilizes other UV filters in combined systems, improving overall formula performance.
Regulatory Status: Permitted in the EU at up to 10% (Annex VI Entry 23) ; listed as a permitted UV filter in China at up to 10% . Not approved by the FDA for sunscreen use in the United States .
Coatings & Films: UV protection for automotive coatings, architectural films, and optical materials.
Engineering Plastics: Suitable for PC, PMMA, PET, PA, and other polymers to prevent UV-induced yellowing and degradation .
Low Volatility: Excellent compatibility with resins, suitable for high-temperature processing .
EU Cosmetics: Maximum 10% in ready-to-use preparations (Entry 23). Nano form (Entry 23a) permitted with additional specifications including purity ≥98.5% and particle size requirements .
United States: Not approved as a sunscreen active ingredient by the FDA. Products containing this ingredient cannot be marketed as sunscreen in the US .
Environmental Hazard: Classified as H413 (May cause long-lasting harmful effects to aquatic life) per some SDS sources . Avoid release to the environment.
Handling: Use in a well-ventilated area. Avoid dust formation and inhalation.
Dual-Use Versatility: Single product suitable for both cosmetic UV filtration and industrial polymer stabilization.
Broad-Spectrum Absorption: Effective across 300–400 nm, covering both UVA and UVB regions .
High Photostability: Benzotriazole structure provides excellent resistance to UV degradation.
Full Documentation: COA and MSDS available upon request.
Standard Packaging: 1 kg / 5 kg / 25 kg in aluminum foil bags or fiber drums, or customized packaging upon request.
Storage Conditions: Store in a tightly closed container in a cool, dry place, protected from light and moisture.
Shelf Life: 24 months under proper storage conditions.