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Vapour pressure

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Description of key information

estimated by calculation (based on Antoine and Grain method, weight-averaged value): 0.003172 Pa at 20 °C (EPIsuite v4.10)
estimated by calculation (based on Grain-Watson estimation method): 12 Pa at 20 °C
experimental value: 2.6E-6 mbar (extrapolated from vapor pressure curve (DSC measurements))

Key value for chemical safety assessment

Vapour pressure:
0.003 Pa
at the temperature of:
20 °C

Additional information

The vapour pressure of the Alcohols, C10-12, ethoxylated (EO<2.5) (CAS 67254 -71 -1) was determined experimentally using boiling point measurements at different pressures and estimated by calculation based on the Grain-Watson Method (according to OECD 104) or the modified Grain method (EPIsuite v4.10).


The experimental value was considered to be not reliable, as it fell outside the recommended range for DSC-based vapour pressure deduction (range: 1-1000 mbar). Alternatively, the Grain-Watson estimation procedure according the OECD Method 104 was applied, which takes into account melting point and boiling point data. 


Additionally, the vapour pressures of possible individual constituents of the substance were calculated using EPIsuite v 4.10 (MPBPVP v 1.43). In order to derive a vapour pressure value for the whole substance, weighting based on normalized composition was applied to the individual data.


In view of the low vapour pressure values obtained from the calculations, EPIsuite weight-averaged value is used to derive the key value for chemical safety assessment.