3 Clases of Light Stabilizers-HALS (Hindered Amine Light Stabilizers); Absorbers(UVA) e.g. benzophenones and benzotriazoles;Quenchers e.g. Ni(Energy transfer)
HALS chemically scavenge free radicals and decompose peroxides;usually more effective.
UVA's need high concentrations and thick polymer governed by Beer Lambert Law
[Absorbance=Ext'n Coeff x Path Length x Concentration]
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