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Vapour pressure

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Description of key information

< 0.35 Pa at 20 °C

Key value for chemical safety assessment

Additional information

The vapour pressure of the substance 6 -methyl-2 -oxoperhydropyrimidin-4yl urea (CAS 1129 -42 -6) was estimated with the use of Grain-Watson estimation as outlined in the OECD Guildeline 104. The experimental result of the DSC method was not in the appropriate validity range with respect to this method. The calculation is based on the lowest possible boiling temperature, which in fact is probably a decomposition temperature. Thus, the obtained value should be considered an upper limit of the vapour pressure and accepted for the risk assessment calculations in the sense of a "worst-case scenario".