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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Additional information

Tert.-Butylperoxy- 2-ethylhexanoat was tested for hydrolysis as function of pH according to EU method C.7 and OECD guideline 111.

In the first supporting study (Gaal,Zs; 2010), tert.-Butylperoxy- 2-ethylhexanoat was not stable at pH 4.0, pH 7.0 and at pH 9.0. Therefore a main test was performed at 50 °C. Due to analytical problems associated with the solutions/dispersions of the test item, no valuable results were found.

In the key study, the calculated half lives of the hydrolysis reactions at pH 4, pH 7 and pH 9 are as follows:

t 1/2 at pH4 and 15 °C: 104 h, 37 °C: 41 h, 60 °C: 17 h;

t 1/2 at ph7 and 15 °C: 86 h, 37 °C: 60 h, 60 °C: 17 h;

t 1/2 at pH9 and 15 °C: 152 h, 37 °C: 84 h, 60 °C: 11 h.

Tert.-Butylperoxy- 2-ethylhexanoat is hydrolytically unstable at pH 4, pH 7 and pH 9.

A second hydrolysis study (Tognucci, A.; 2002) was performed. Based on the results of the preliminary test the hydrolysis rate of TBPEH was found to be more than 10 % at pH 4, pH 7 and pH 9 after 5 days at 50 °C, therefore it is considered to be hydrolytically unstable. Hydrolysis rate of TBPEH at pH 4 was 70 %, at pH 7 75 % and at pH 9 about 84 %.