Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Biodegradation in water:

Under the conditions of a closed bottle test according to OECD 301D (2018), the test item was biotically degraded by 61 % after 28 days. Therefore, the test item is considered to be readily biodegradable.



The performance of a test for bioaccumulation in aquatic species, preferably fish, is scientifically unjustified.

REACH Regulation No. 1907/2006, Annex IX, Sect. 9.3.2, Col. 2, states as follows:

“9.3.2 The study need not be conducted if:

- the substance has a low potential for bioaccumulation (for instance a log Kow <= 3) and/or a low potential to cross biological membranes, or

- direct and indirect exposure of the aquatic environment is unlikely. ”


Direct and indirect exposure of the test item to water is highly unlikely. Due to the unstable nature of organic peroxides, it can be assumed that upon contact with water and organic matter, the test item undergoes rapid degradation resulting in the formation of respective alcohols and acids. Therefore, tert-butyl peroxypivalate was considered to have no bioaccumulation potential. Using EPIWIN 4.10 a BCF of 32.57 L/Kg wwt was calculated indicating no potential for bioaccumulation.


Transport and distribution:

According to OECD guideline no. 121 and EU method C.19 the log Koc of tert-butyl peroxypivalate was determined to be 1.59 using the HPLC method.