BLS 5411

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BLS 5411 (3147-75-9) is a benzotriazole type ultraviolet light absorber (UVA), imparting good light stability for plastics and other organic polymers.  BLS 5411 protects polymers as well as organic pigments from UV radiation helping to preserve the original appearance and physical integrity of polymeric systems; particularly in polyesters, polyvinyl chlorides, styrenics, acrylics, polycarbonates and polyvinyl butyral during outdoor weathering.



Chemical Name:         2-(2-hydroxy-5-tert-octylphenyl) benzotriazole

CAS Number:             3147-75-9

Chemical Structure:

BLS 5411


Typical Properties         

Product Form:                         Solid

Melting Point:                          102 – 106oC

Molecular Weight:                   323 g/mol


BLS 5411 is useful for the light stabilization of plastics, including in polyesters, rigid and flexible PVC, styrenic polymers, acrylics, polycarbonates and polyvinyl butyral during outdoor weathering. Typical end use applications include molded items, extruded sheets, glazing materials for window lighting, signs, marine and automotive applications. Specialty applications include coatings (polyester gel coats), photographic products, sealants, and elastomers.


  • Strong absorption of ultraviolet radiation in the 300-400 nm region
  • Low color contribution
  • Good compatibility and solubility
  • FDA cleared for use in polycarbonate

Guidelines for Use

Typical recommended use levels range between 0.1% and 0.5% in plastics, and between 0.5% and 3% in polyester gel coats. Combinations with other light stabilizers such as HALS and benzoates often show enhanced performance. The exact formulation to be used is dependent on the substrate, performance requirements, and other factors, and should be determined by the user based on testing to simulate actual conditions of use. Please contact Mayzo for specific recommendations.


This product may be stored up to two years in a sealed container. Containers should be kept tightly closed when not in use and stored in a cool, dry place.


Please consult the Safety Data Sheet (SDS) prior to handling or using this product.

FDA Regulations

BLS 5411 has been cleared for use in polycarbonate resins under 21 CFR §178.2010. Please contact your Mayzo representative for complete details, including restrictions of use.

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