UVabsorber

UV absorber is a chemical additive that absorbs ultraviolet radiation and dissipates the energy as heat, protecting materials from UV-induced degradation and color change. It is used in a wide range of products, including plastics, coatings, textiles, wood finishes, and packaging, as well as in sunscreens and other cosmetic products to shield skin and dyes from UV damage.

UV absorbers work by covering parts of the UV spectrum, typically from about 280 to 400 nanometers, and converting absorbed light into heat. They can be organic compounds, such as benzotriazoles, benzophenones, cinnamates, and salicylates, or inorganic materials like zinc oxide and titanium dioxide that act as physical filters. Organic absorbers are often chosen for their tunable spectral coverage and color properties, while inorganic filters provide durable, broad-range UV blocking.

Applications and considerations vary by field. In plastics and coatings, UV absorbers help prevent polymer chain scission, crosslinking changes, and fading of pigments, extending product lifetimes. In packaging, they protect contents and maintain clarity and appearance. In cosmetics and skincare, UV absorbers function as sunscreens, providing protective filters against sunburn and photoaging. Selection depends on factors such as spectral coverage, photostability, compatibility with the matrix, processing conditions, and regulatory requirements.

Safety and environmental aspects are considered in formulation and product stewardship. Some UV absorbers can migrate under use or release into the environment, and ecotoxicological and regulatory assessments influence acceptable uses and concentrations. Manufacturers continuously improve stability and reduce migration while meeting safety standards.