Mayzo’s Expert Technical Team Helps UV-328 Users Discover Effective Alternative Solutions

Photo Caption: UV-328 – (2-(2H-benzotriazol-2-yl)-4,6-di-tert-pentylphenol)

At the end of September 2022, the Persistent Organic Pollutants (POPs) Review Committee (POPRC) to the Stockholm Convention held its 18th annual meeting during which it agreed to recommend listing the substance UV-328 (CAS 25973-55-1) under Annex A for global elimination of all production and use. A set of time limited exemptions were also recommended to allow some sectors including aerospace and legacy vehicle parts to phase out the chemical. 1

The over 180 countries that are signatories to the Stockholm Convention will now meet in May 2023 to review the POPRC’s recommendation and finalize the listing.

UV-328 is used to absorb UV light in a variety of plastics and coatings including in food contact applications. The EU legally recognized UV-328 as a substance of very high concern (SVHC) in 2014, and it has been on the REACH Authorization list since 2019. UV-328 is unique in that it is the first substance to be proposed for listing under the convention that does not contain any halogens (fluorine, chlorine, or bromine).

For the past several months Mayzo’s technical team has been assisting users find safe alternatives before a possible permanent ban is put into place in May of 2023.

Mayzo provides specialty chemical additive solutions on a global scale in a wide range of markets. Since 1986, customers have relied on the Mayzo team for their ingenuity, responsiveness, and extraordinary service culture.

To learn more visit, or contact the company at 1-800-449-9068, or by email at


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