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Hindered Amine Light Stabilizers (HALS) are derivatives of 2,2,6,6-tetramethyl piperidine and are among the most efficient stabilizers against light-induced degradation of most polymers, especially PP and PE. Their high efficiency and longevity, resulting in a relatively low concentration required to achieve significant levels of stabilization are due to a cyclic process wherein the HALS are regenerated rather than consumed during the stabilization process. This substance significantly prevents paint layers from crackin and flaking exposed to sunlight, particularly in car paints; works well with benzotriazole UV absorbers, widely used in all types of polymers including PVC.
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