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Physical & Chemical properties

Vapour pressure

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Description of key information

1. estimated by calculation (based on modified Grain method, weight-averaged value): 0.0001568 Pa at 20 °C (EPIsuite v4.10)
2. experimental value: < 5 Pa at 20 °C and 50 °C (NFT 20-048, static method)

Key value for chemical safety assessment

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

Additional information

The vapour pressure of substance Alcohols, C16 -18, ethoxylated, < 2.5 EO (CAS 68439-49-6) 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 not well defined (< 5 Pa) and higher than expected. Although the lower limit of the method was reported as 0.1 Pa and

even though the test was performed at 20 °C and 50°C, the result was reported as a range. Since the vapour pressure could not be well defined by the

chosen test method, the test result was not considered as input data for the derivation of the key value for chemical safety assessment.

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.

Additionally the vapour pressures of some individual constituents with ethoxylation degree nEO = 0 and nEO = 3 were calculated using Sparc v4.6 solute-solute physical process models. The obtained values for nEO = 0 are in good agreement with the EPIsuite data, whereas the values for nEO = 3 are higher than the EPIsuite calculated values, yet still well below 0.0001 Pa, what confirms that the vapour pressure of the substance is much lower than 5 Pa.

For chemical safety assessment purposes the weight-averaged vapour pressure of 0.0001568 Pa at 20 °C derived from EPIsuite is used as key value.