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Registration Dossier
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EC number: 220-479-1 | CAS number: 2781-00-2
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
From the read across with 1,3 (or 1,4)-bis[1-(tert-butylperoxy)-1-methylethyl]benzene, extrapolated values at 25°C (using the Arrhenius equation):
pH 4 : half-life = 56.4 d
pH 7: half-life = 74.7 d
pH 9: half-life = 96.5 d
Key value for chemical safety assessment
- Half-life for hydrolysis:
- 74.7 d
- at the temperature of:
- 25 °C
Additional information
There is no data on 1,4-bis[1-(tert-butylperoxy)-1-methylethyl]benzene. A read across approach is proposed with 1,3 (or 1,4)-bis[1-(tert-butylperoxy)-1-methylethyl]benzene.
The hydrolysis of [1,3(or 1,4)-phenylenebis(1-methylethylidene)]bis[1,1-dimethylethyl] peroxide was evaluated in a study performed in accordance with OECD testing guideline 111 and EPA OPPTS 835.2110 under GLP requirements.
The results from the hydrolysis test indicate that 64.6, 71.4 and 77.3% of the reaction were observed after 5 days at pH 4, 7 and 9 solutions respectively, at 50 °C. The test has demonstrated that the substance is hydrolytically stable at pH 2.6 after 24 hours. The degradation rates were calculated using first order kinetics as follows:
At 50°C:
pH 4 : half-life = 7.9 d
pH 7: half-life = 10.3 d
pH 9: half-life = 13.4 d
Extrapolated values at 25°C, using the Arrhenius equation:
pH 4 : half-life = 56.4 d
pH 7: half-life = 74.7 d
pH 9: half-life = 96.5 d
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