UV stabilizers protect plastics from degradation caused by ultraviolet radiation. Exposure to sunlight can break polymer chains, causing fading, chalking, embrittlement, and loss of mechanical properties. These additives either absorb UV radiation (UV absorbers), neutralize radicals (HALS—Hindered Amine Light Stabilizers), or quench excited states.
They are heavily used in outdoor applications like agricultural films, automotive parts, construction materials, and outdoor furniture. Benefits include extended product life, color retention, and mechanical integrity. Proper selection depends on polymer type, exposure conditions, and desired lifetime.