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Physical & Chemical properties

Vapour pressure

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Description of key information

The QSAR determination of the vapour pressure of bis(2-ethylhexyl) hydrogen phosphate using the model MPBPWIN included in the Estimation Program Interface (EPI) Suite v4.11 revealed a value of 2.40E-5 Pa at 25°C.

Key value for chemical safety assessment

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

Additional information

The vapour pressure of bis(2-ethylhexyl) hydrogen phosphate was predicted using the QSAR calculation of the Estimation Program Interface (EPI) Suite v4.11. A boiling point of 400°C (calculated by MPBPWIN v1.43) was taken into account for estimation. Using the modified Grain method, the vapour pressure was estimated to be 2.40E-5 Pa at 25°C. The predicted value can be considered reliable yielding a useful result for further assessment.

Tris(2-ethylhexyl) phosphate is considered as structural analogues, containing the same structural fragments as bis(2-ethylhexyl) hydrogen phosphate and is located in the test dataset. Tris(2-ethylhexyl) phosphate is also a liquid, and the model uses the boiling point for estimation. Although an experimentally determined boiling point of 215°C is available for tris(2-ethylhexyl) phosphate, it cannot be used for calculation as it is obtained at 533 Pa. Therefore, the vapour pressure is estimated based upon a calculated boiling point of 446.31 °C, which is in the same order of magnitude as the calculated boiling point for bis(2-ethylhexyl) hydrogen phosphate. Thus, the probability is high, that the rules applied by the program for bis(2-ethylhexyl) hydrogen phosphate are appropriate.