Coating Terms

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General name of additives used to prevent degradation of organic coating films exposed to UV light. UV stabilizers are classified into two groups. UV stabilizers (also called as UV absorbers). They convert the absorbed UV energy into heat and this heat is then dissipated through the substrate. Benzophenones and benzotriazole derivatives are commonly used UV stabilizers. The other group is free radical scavengers. They act by trapping the free radicals formed by UV light and decompose these radicals along with themselves hereby suppress the degradation of coating. Hindered amine light stabilizers (HALS) are used as free radical scavengers.