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Vapour pressure

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vapour pressure
Data waiving:
study technically not feasible
Justification for data waiving:
the study does not need to be conducted for organic peroxides
vapour pressure
Type of information:
Adequacy of study:
key study
Study period:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
Justification for type of information:
The experimental determination of the vapour pressure of the test item OO-tert-butyl monoperoxymaleate is technically not feasible because the substance decomposes during testing. However, for the required exposure scenario in this tonnage band, a vapour pressure value needs to be provided which is estimated by QSAR calculation.
according to
other: Guidance on information requirements and chemical safety assessment Chapter R.6: QSARs and grouping of chemicals
Version / remarks:
May 2008
Principles of method if other than guideline:
QSAR prediction using MPBPVP v1.43 of EpiSuite v4.1.
GLP compliance:
Type of method:
other: QSAR calculation
Specific details on test material used for the study:
Key result
25 °C
Vapour pressure:
0.147 Pa
Remarks on result:
other: Modified Grain Method


The vapour pressure of the test item was estimated by QSAR and is 0.147 Pa at 25 °C (Modified Grain Method).
Executive summary:

The calculated vapour pressure of OO-tert-butyl monoperoxymaleate is 0.147 Pa at 25 °C. The substance is considered to be in the applicability domain of the model, and despite moderate model accuracy due to the usage of an estimated boiling point and an estimated melting point for vapor pressure prediction, MPBPVP methodology is considered adequate for a regulatory conclusion.

Description of key information

In accordance with the ECHA Guidance R.7a (Version 6.0, July 2017) this study does not need to be conducted for substances that decompose during measurement or that are unstable or explosive because determination of the vapour pressure is technically not possible. This applies to organic peroxides.

As a vapour pressure value is required for exposure calculations, the EPISuite estimated vapour pressure value of 0.147 Pa at 25 °C is included as key value for chemical safety assessment.

Key value for chemical safety assessment

Vapour pressure:
0.147 Pa
at the temperature of:
25 °C

Additional information