Sulisobenzone, recognized by its molecular formula C14H12O6S, forms the backbone of various UV-filtering solutions. With the IUPAC name 5-benzoyl-4-hydroxy-2-methoxybenzenesulfonic acid, this substance appears most often as a white to off-white solid. Some processes can yield it in fine flakes, crystalline powder, or sometimes as granules, depending on the manufacturing route and the specific end use. The CAS number, a crucial identifier across chemical inventories worldwide, is 4065-45-6, and the HS Code commonly associated with Sulisobenzone falls under 2932209090, which covers organic compounds used for their UV absorption or light stabilization properties.
The molecular structure combines a sulfonic acid group, methoxy, and benzoyl segments in a way that allows selective absorption of ultraviolet radiation, particularly in the UVA and UVB spectrum. Its molar mass rests at around 308.31 g/mol, and it dissolves in water up to a practical limit, with better solubility seen in alcohols and polar organic solvents. The density ranges from 1.46 to 1.49 g/cm3. The melting point typically comes in between 131 and 134°C, signaling relative thermal stability under standard storage and transport conditions. Given its crystalline or powder state, the particle size distribution can significantly influence blending and formulation in end products like cosmetics or coatings.
Depending on the final application, Sulisobenzone gets processed further into near-pure crystalline solid for analytical standards or as a fine powder for cosmetic ingredient mixes. In some industrial setups, the need for uniform particle flow leads to spherical granulation or slurry preparations, making integration into lotions, sprays, and emulsions more feasible. In laboratory environments, liquid solutions increase dosing accuracy and experimental repeatability. Yet in bulk transport, solid flakes or powder ease handling and minimize the risks related to spills or volatilization.
As a raw material, Sulisobenzone primarily serves manufacturers in the sunscreen industry, but it also finds spots in plastics, paints, and specialty coatings to prevent UV-induced degradation. The underlying chemistry enables absorption of specific UV wavelengths, providing an invisible shield for skin or material surfaces. This ability has scientific roots in the resonance-stabilized structure, allowing safe dissipation of absorbed energy instead of passing it along to other, more sensitive compounds.
Handling Sulisobenzone calls for respect toward its chemical nature. While it rates low on acute toxicity, fine powders mean respiratory protection is not optional in industrial settings, especially over long production shifts. The material does not ignite easily, but dust clouds in confined spaces always require careful dust management. Beyond plant safety, its environmental fate deserves regular scrutiny. As a water-soluble aromatic compound, Sulisobenzone can travel through wastewater systems, pressuring treatment plants to remove or degrade it before reaching rivers and oceans. Studies have shown traces persisting in aquatic environments, sparking continuous research into eco-friendlier formulations. Manufacturers benefit from transparent labeling reflecting the current Material Safety Data Sheet, allowing workers and emergency responders to act swiftly in case of accidental exposure.
Regulatory frameworks on Sulisobenzone stretch from ingredient purity (typically not less than 99%) to allowable residual solvents and heavy metals. Cosmetic regulations in the United States, European Union, and parts of Asia list Sulisobenzone in their rosters of permitted UV filters, each capping the concentration levels in final products. Specification sheets detail everything from physical form, melting range, sieve analysis, assay results, pH of aqueous solutions, and presence of trace contaminants—information sought by procurement specialists and QA managers before signing off on a bulk batch. These rules not only reduce risk to consumers but also shape the innovation of downstream products.
Prolonged use of personal-care products with Sulisobenzone has raised some concerns about systemic absorption and allergic responses in sensitive individuals. Product developers account for these risks by diversifying UV filters and offering sensitive-skin options with lower risk profiles. In manufacturing environments, effective dust control systems and personal protective equipment lower inhalation risk. Treatment plants face the engineering challenge of breaking down persistent organic UV filters. Adopting advanced oxidation processes or refined filtration systems helps lower environmental burden. A collaborative approach—from raw material chemists to regulatory bodies—ensures that progress in UV protection does not outpace our ability to keep workers, consumers, and the environment safe.
Sulisobenzone remains integral in UV-protection chemistry. Its physical and chemical properties foster innovation, yet also remind decision-makers about the balance between product performance, user safety, and environmental protection. As knowledge deepens about its interactions in biological and ecological systems, stakeholders have the responsibility to follow ethical, scientific, and regulatory guidance, promoting both public health and sustainability in industrial progress.
