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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Vapour pressure

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Description of key information

The QSAR determination of the vapour pressure of the zinc free substance '5,5'-(E)-diazene-1,2-diylbis(4,6-dihydroxypyrimidin-2(5H)-one)' using the model MPBPWIN included in the Estimation Program Interface (EPI) Suite v4.11 revealed a value of 2.83E-14 Pa at 25°C. The predicted value can be considered reliable yielding a useful result for further assessment.

Key value for chemical safety assessment

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

Additional information

The lowest value which can be added in IUCLID is 10E-09 which is higher than the real vapour pressure of the substance. It is, thus, important to have in mind that the real vapour pressure is clearly lower than the one reported as key value.

The vapour pressure was estimated using the formula of the zinc-free “Zinc-Azo barbituric acid/Melamine". The calculation of the vapour pressure of the original substance containing Zinc is not feasible as the EPIWIN model is not validated for organometal complexes. It is however expected that the vapour pressure of the zinc containing substance is in the same order of magnitude as the corresponding zinc-free compound.