Light stabilizers / UV absorbers combat the degradation that plastics can undergo under the effects of sunlight, UV rays, heat and reaction with oxygen. The changes witnessed in a plastic can range from discoloration to formation of cracks. Addition of light stabilizers / UV absorbers can extend the life and improve the appearance of the plastic.
Amine light stabilizers, HALS are long-term thermal stabilizers that act by trapping free radicals formed during the photo-oxidation of a plastic material and thus limiting the photodegradation process.
Ultraviolet Absorbers are a type of light stabilizer that functions by competing with the chromophores to absorb UV radiation. Absorbers change harmful UV radiation into harmless infrared radiation or heat that is dissipated through the polymer matrix.
Quenchers return excited states of the chromophores to ground states by an energy transfer process. The energy transfer agent functions by quenching the excited state of a carbonyl group formed during the photo-oxidation of a plastic material and through the decomposition of hydroperoxides.
Variety of thermoplastic processes