Cel-Span 717 UVS is a Hindered Amine Light Stabilizer (HALS) concentrate that imparts additional UV resistance in polyolefin based materials. HALS are an extremely efficient additive because they continuously repopulate themselves during the stabilization process. A let-down ratio of 2.0 - 5.0% is recommended to impart polyolefins with an acceptable level of UV stabilization.
