Isotridecanol, ethoxylated

Vapour pressure

Description of key information

1. estimated by calculation (based on Antoine & Grain or modified Grain method, weight-averaged value): 0.0074344 Pa at 20 °C, 0.01358 Pa at 25 °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:

0.007 Pa

at the temperature of:

20 °C

Additional information

The vapour pressure of the substance was determined experimentally using the static method (according to NFT 20 -048) and estimated by calculation based on the Antoine & Grain or modified Grain method (EPIsuite v4.10).

 

The experimental value is 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 < 5 Pa at either test temperature. This indicates that the vapour pressure of the substance is much lower than the stated value. 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.

Due to the undefined experimental value, for chemical safety assessment purposes the weight-averaged vapour pressure value derived from EPIsuite calculations (at 20 °C) is used as key value.