Registration Dossier
Registration Dossier
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EC number: 239-741-1 | CAS number: 15667-10-4
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
The half-life for 1,1-di(tert-amylperoxy)cyclohexane at 25°C has been determined to be 1.43 hour at pH 4, 5.36 hours at pH 7 and 6.41 hours at pH 9. At pH 1.2 and 37°C, the half-life is < 10 min.
Key value for chemical safety assessment
- Half-life for hydrolysis:
- 5.36 h
- at the temperature of:
- 25 °C
Additional information
The rate of hydrolysis of 1,1-di(tert-amylperoxy)cyclohexane (tested in presence of isododecane) as a function of pH has been studied according to the OECD 111 Guideline and GLP requirements (Chastenet, 2017).
The hydrolysis of the test item was assessed in aqueous buffers at pH 1.2, 4, 7 and 9 at 50 ± 0.5°C. The mean loss of test item, compared to T0, was determined to have changed by more than 10% after 5 days for all tested pH. This indicated that the test item was clearly hydrolytically unstable at all these pH and that significant hydrolysis had occurred.
Therefore, the definitive test was conducted at pH 1.2, 4, 7 and 9. Here are the results of half-life for each pH:
- the half life of the test item at pH 1.2 and 37°C was determined to be < 10 min;
- the half life of the test item at pH 4.0 and 25°C was determined to be 1.43 hours;
- the half life of the test item at pH 7.0 and 25°C was determined to be 5.36 hours;
- the half life of the test item at pH 9.0 and 25°C was determined to be 6.41 hours.
The concentration of hypothetical hydrolysis products is too low to allow their detection. The OECD 111 criteria on mass balance for cold material (70%-110% accepted range) could thus not be determined.
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