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Hindered amines show excellent UV protection by scavenging free radicals generated by photo degradation. When to use HALS or other light stabilizers depends on the processing requirements and demands of the end user. In some cases, combinations of light stabilizers have shown superior performance. 

Specialty additives
ADK STAB LA-81 is a high performing third generation HALS (hindered amine light stabilizer) that can stabilize polymers against photo-degradation even in strong acidic environment.
Specialty additives
PALMAROLE HALS 92 is a hindered amine light stablizer for use in polymers, coatings and adhesives.