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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2018-06-27 to 2018-10-09
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
1981
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: Knudsen cell
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Key result
Temp.:
50 °C
Vapour pressure:
0 Pa
Key result
Vapour pressure:
0 Pa

The vapour pressure was measured in the temperature range of 120.9 °C to 140.9 °C. The measured vapour pressure values together with the measured temperatures are listed in Table 1:

Results of the Effusion method

No.

Temperature / °C

Vapour pressure / Pa

1

120.9

0.42

2

126.0

0.76

3

131.0

1.39

4

135.9

2.59

5

140.9

4.29

The measured vapour pressures in the temperature range of 131.0 – 140.9 °C are slightly outside the measuring range (10-3to 1 Pa) of the Knudsen cell. Nevertheless, as the vapour pressure value above 1 Pa could be detected properly by the Knudsen cell, this value can be used for the evaluation.

From the measured data points of the vapour pressure curve the constants A and B of the Antoine equation

log10p = A + B/T = A + B/C + υ

can be derived by regression of the data points to

A = 20.7678

B = -8333.56

C = 273.15.

Conclusions:
The vapour pressure of the test item TA-2 was calculated for the temperatures 20, 25 and 50 °C by extrapolation of the measured vapour pressure curve, according to Regulation EC No. 440/2008 Method A.4.Vapour Pressure and OECD Test Guideline 104 (2006).

Description of key information

The vapour pressure of the test item TA-2 was calculated for the temperatures 20, 25 and 50 °C by extrapolation of the measured vapour pressure curve, according to Regulation EC No. 440/2008 Method A.4.Vapour Pressure and OECD Test Guideline 104 (2006). At 25°C the test item exhibits a vapour pressure of 6.6E-8 Pa.

Key value for chemical safety assessment

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

Additional information