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Physical & Chemical properties

Vapour pressure

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Administrative data

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: vapour pressure balance
Key result
Temp.:
ca. 20 °C
Vapour pressure:
< 0.001 Pa
Key result
Temp.:
ca. 25 °C
Vapour pressure:
< 0.001 Pa
Key result
Temp.:
50 °C
Vapour pressure:
< 0.001 Pa

The vapour pressure was measured in the temperature range of 40 to 60 °C. At 60 °C the vapour pressure of the test item was < 10 exp. -5 hPa. The vapour pressure for the test item at 20, 25 and 50 °C is calculated via the Antoine equation. Values for the slope of the Antoine equation (constant B) for comparable substances, which can be found in the literature (e.g. Handbook of Chemistry and Physics) are normally lower than -5000. Thus, for a conservative estimation of the vapour pressure a slope (consstant B) of -5000 was used. The last data point of the measurement at 60 °C was used as starting point for the calculation.For a conservative estimation, it was assumed that the vapour pressure at 60 °C corresponds to the lowest detection limit of the vapour pressure balance, ie 10 exp -5 hPa. Constant A of the Antoine equation was calculated (=10.01). Knowing constant A and B enables calculation of the vapour pressure with the Antoine equation.

 T [°C]  p [hPa]  p [Pa]
 20  8.99 x 10 exp -8    8.99 x 10 exp -6
 25 1.74 x 10 exp -7   1.74 x 10 exp -5
 30   3.45 x 10 exp -6     3.45 x 10 exp -4

This is a conservative estimation of the vapour pressure of the test item for the listed temperatures derived from the detection limit. It may safely be assumed the the vapour pressure at the above listed temperatures is below 10 exp -5 hPa.

Conclusions:
This is a conservative estimation of the vapour pressure of the test item for the listed temperatures derived from the detection limit. It may safely be assumed that the vapour pressure at the above listed temperatures is below 10 (exp-5) hPa, 10 (exp-3) Pa.
Executive summary:

This is a conservative estimation of the vapour pressure of the test item for the listed temperatures derived from the detection limit. It may safely be assumed that the vapour pressure at the above listed temperatures is below 10 (exp-5) hPa, 10 (exp-3) Pa.

Description of key information

This is a conservative estimation of the vapour pressure of the test item for the listed temperatures derived from the detection limit it ay safely be assumed that the vapour pressure at 20 °C and 25 °C is below 10 (exp-5) hPa,  10 (exp-3) Pa.

Key value for chemical safety assessment

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

Additional information