Hindered Amine Light Stabilizers

Hindered Amine Light Stabilizers (HALSs) are a class of highly effective light stabilizers for polymeric materials, providing long-term photostability through a unique radical scavenging mechanism. Unlike traditional UV absorbers that absorb UV radiation directly, HALSs offer superior protection against material degradation by inhibiting photo-oxidation through chemical means.

Working principle:
HALSs work through:
Radical scavenging: Trapping alkyl radicals generated during photo-oxidation to interrupt the degradation chain reaction;
Peroxide decomposition: Decomposing hydroperoxides produced during the photo-oxidation process;
Regenerative cycle: Part of the HALS can regenerate after its initial effect, achieving lasting protective effect

Benefits of FOPIA products:
Effectiveness: 2-4 times more effective than conventional UV absorbers
Lasting protection: Regenerative ability ensures extended protection
Synergistic effect: Works exceptionally well when used together with UV absorbers

Main Types of FOPIA products:
Low molecular weight: E.g. FENTASTAB  770, for thin products
High molecular weight: E.g. FENTASTAB  944, for thick products
Liquid: E.g. FENTASTAB 292, to effectively prevents gloss loss and coating cracking, thereby extending the service life of the coating

Applications:
Polyolefins (PP/PE) products, automotive exterior parts, agricultural films, engineering plastics, coatings and inks

Thanks to their exceptional effectiveness and extended performance, HALSs have become preferred stabilizers for weather-resistant polymer modification, particularly for outdoor applications requiring long-term performance.