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VeilleNanos - MBBT or "Bisoctrizole" in nano form

MBBT or “Bisoctrizole” in nano form

+ Info sheets

By the AVICENN team – Last updated November 2020


Methylene bis-benzotriazolyl tetramethylbutylphenol (MBBT), otherwise known as “Bisoctrizole” (CAS number: 103597-45-1), is a UV filter authorized in nano form at the European level within the framework of the Cosmetics Regulation at a concentration of 10 % m/m (except for applications that may result in end-user lung exposure through inhalation of this substance). It is used in the BASF product Tinosorb®1MCf. BASF welcomes EU approval of nano-sized UV filter in cosmetics, BASF, July 30, 2018.

According to the Ministry of Ecological Transition and Solidarity2Cf. bilan R-nano 2019, Ministry of Ecological Transition and Solidarity, June 2020, between 10 and 100 tons of nano MBBT were officially imported or manufactured in France in 2018. This range is not very precise and should be considered as an indication only because the quantities registered in the French R-nano register are below the quantities actually present on the French market, as many nanomaterials escape declaration.

There are strong uncertainties about the risks associated with MBBT, which is insoluble and persistent/bioaccumulative, leading the European Scientific Committee on Consumer Safety (SCCS) to place nano MBBT at the top of the list of riskiest nanomaterials in the cosmetics sector in October 2020.

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File initially created in November 2020

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