Overview
UV-shielding titanium dioxide (TiO2) is a high-performance variant of titanium dioxide engineered to absorb and scatter ultraviolet (UV) radiation. Unlike standard TiO2, it is optimized for applications requiring UV protection, such as sunscreens, automotive coatings, and outdoor plastics. Its effectiveness stems from its ability to block both UV-A (320–400 nm) and UV-B (280–320 nm) wavelengths. TiO2 exists in two primary crystal phases: rutile and anatase. Rutile is preferred for UV shielding due to its higher refractive index and stability. The material is also valued for its non-toxicity, photostability, and compatibility with other ingredients in formulations.
Physical and Chemical Properties
UV-shielding TiO2 is a white, odorless powder with a high melting point (1843°C) and boiling point (2972°C). Its density varies slightly between crystal phases, with rutile being denser (4.23 g/cm³) than anatase (3.89 g/cm³). The material is insoluble in water and most organic solvents, ensuring durability in aqueous and non-aqueous formulations. Key to its UV-blocking capability is its bandgap energy (~3.2 eV for anatase, ~3.0 eV for rutile), which allows it to absorb UV light effectively. Particle size is critical: nanoscale particles (10–100 nm) provide transparent UV protection in sunscreens, while larger particles (200–300 nm) are used in opaque coatings.
Main Applications
The primary use of UV-shielding TiO2 is in sunscreens, where it acts as a physical UV filter. It is also widely employed in automotive and architectural coatings to prevent UV-induced degradation of substrates. In plastics, it extends the lifespan of outdoor products like furniture and packaging by blocking UV rays that cause yellowing and brittleness. Other applications include UV-protective textiles, cosmetics (e.g., foundations with SPF), and food packaging to prevent light-induced spoilage. Its inertness and safety make it suitable for direct contact with skin and food, subject to regulatory approvals.
Safety and Storage
UV-shielding TiO2 is generally recognized as safe (GRAS) for topical use in sunscreens and cosmetics. However, inhalation of fine powder should be avoided, as it may cause respiratory irritation. Proper personal protective equipment (PPE), such as masks and gloves, is recommended during industrial handling. Storage requires a cool, dry environment to prevent clumping due to moisture absorption. Bulk material should be kept in sealed containers away from direct sunlight to maintain stability. Regulatory compliance (e.g., FDA, EU Cosmetics Regulation) must be verified for specific applications.
B2B Procurement Guide
When procuring UV-shielding TiO2, prioritize suppliers that provide detailed technical specifications, including crystal phase (rutile preferred), particle size distribution, and surface treatments (e.g., silica/alumina coatings for dispersion stability). Certificates of analysis (CoA) and compliance with REACH, FDA, or other regional regulations are essential. Pricing varies by purity, particle size, and volume. Nanoscale grades command higher prices (~$6–$8/kg) than micro-scale grades (~$3–$5/kg). For sunscreens, opt for coated nanoparticles to minimize photocatalytic activity. Sample testing is advised to confirm performance in the intended formulation.
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