The use of UV stabilizer additives can inhibit or absorb the harmful UV radiation that causes degradation of the polymer. There are two primary types of stabilizers used today :
UV absorbers and Hindered Amine Light Stabilizers (HALS). UV absorbers work by absorbing the UV rays and dissipating them into thermal energy. UV absorber chemistries include benzophenones, benzotriazoles and hydroxyphenyl triazines.
HALS work by scavenging free radical intermediates generated by the UV rays to neutralize the degradation. In both cases, the damaging effect of the UV light is focused away from the base polymer and colorants due to interaction with the UV additive present in the base polymer. It is mportant to know the specifics of the end-use environment, polymer base and processing conditions to design the most effective UV stabilization package to meet the performance expectations.
The use of UV stabilizers will retard the harmful effects of UV radiation on polymer properties. This provides several benefits:
•  Reduced field failures and returns
•  Increase shelf life for end products
•  Ability to store parts outside for longer periods
•  Protection against premature color fading

POLYETHYLENE (Stabilization and Compounding)

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