Registration Dossier
Registration Dossier
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EC number: 247-988-1 | CAS number: 26762-93-6
Endpoint summary
Administrative data
Link to relevant study record(s)
Description of key information
There is no experimental data on toxicokinetic.
Absorption
Diisopropylbenzene hydroperoxide has a molecular weight of 194.3 g/mol, a moderate solubility in water (624 mg/L at 20°C), an experimental log Ko/w of 3.1 and a vapour pressure of 6.7 hPa at 25 °C.It was not shown to be significantly hydrolysed even at pH 1.2/37 °C (half-life: 28.2 hours), therefore following oral/inhalation/dermal route, it is expected to be absorbed unchanged.
Oral absorption is favoured for molecular weights below 500 g/mol. Based on the moderate log Ko/w of 3.1, diisopropylbenzene hydroperoxide can be regarded as a moderately lipophilic substance. Such a lipophilic compound may be taken up by micellular solubilisation. Using a model to predict either high or low fraction absorbed for an orally administered, passively transported substance, the rates of absorption were 100 and 95% for a dose of 1 and 1000 mg of peroxide, respectively (Danish QSAR database).
Based on the moderate vapour pressure of 5 hPa at 25 °C, inhalation exposure is likely. As Luperox DH is a mixture of diisopropylbenzene hydroperoxide in diisopropylbenzene, with other diisopropylbenzene oxidation by-products, this vapor pressure is a worth case figure, representing mostly the impurities vapor pressure.
Similarly, diisopropylbenzene hydroperoxide is likely to penetrate skin regarding the moderate logKo/w value and water solubility. Between water solubility of 100-1000 mg/l absorption is anticipated to be moderate to high. Furthermore, application of Luperox DH to skin of rabbits was responsible of corrosive effects, which could increase the dermal uptake.
The dermal absorption of diisopropylbenzene hydroperoxide was estimated with IH SkinPerm v2.04 model (AIHA, 2018). Compared to in vitro data from OECD 428 studies, IH skinPerm allowed the estimation of the dermal absorption rate with a good confidence and a low frequency (ca. 2%) of underestimation for liquids (Arkema’s internal validation study, 2018). According to the data input, IH SkinPerm v2.04 model leads to the following results:
|
Instantaneous deposition End time observation 8 hr |
Deposition over time End time observation 8 hr |
Total deposition (mg) |
1000 |
8000 |
Fraction in stratum corneum (%) |
9.5 |
4.8 |
Fraction in viable epidermis (%) |
31.4 |
3.9 |
Absorbable fraction (%) |
40.9 |
8.7 |
Lag time stratum corneum (min) |
12.1 |
|
Max. derm. abs. (mg/cm²/h) |
0.0197 |
|
Therefore, according to the REACH Guidance, default values of 100, 50 and 100% will be used for oral, dermal and inhalation absorptions of diisopropylbenzene hydroperoxide, respectively.
Metabolism and excretion:
There is no data on diisopropylbenzene hydroperoxide metabolism or on diisopropylbenzene metabolism.
Bioaccumulation potential:
As the LogBCF is 2, diisopropylbenzene hydroperoxide is not anticipated to accumulate in the human body.
Key value for chemical safety assessment
- Bioaccumulation potential:
- no bioaccumulation potential
- Absorption rate - oral (%):
- 100
- Absorption rate - dermal (%):
- 50
- Absorption rate - inhalation (%):
- 100
Additional information
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