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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 %.