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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:
15th July 2011
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
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: isothermal thermogravimetry
Temp.:
20 °C
Vapour pressure:
0 Pa
Remarks on result:
other: 1.6 x 10^-10 mmHg
Temp.:
25 °C
Vapour pressure:
0
Remarks on result:
other: 3.9 x 10^-10 mmHg

The results of the isothermal TGA analysis for the test substance and the vapour pressure at 20°C and 25°C are given in Table 1 and Table 2.

The plot of the log PT of the test substance as function of the reciprocal temperatures is represented by the equation log PT,20 = - 6905 1/T + 15.88 (r = 0.992, n = 8).

Table 1: Results of the isothermal TGA analysis

Temperature

[°C]

Weight loss

[μg/min]

νT

[g/cm2/h]

log νT

log PT

PT

[Pa]

210

36.85

4.40 x 10-3

-2.36

1.62

41.3

32.30

3.86 x 10-3

-2.41

1.55

35.4

220

67.44

8.05 x 10-3

-2.09

1.92

83.0

58.16

6.94 x 10-3

-2.16

1.84

70.0

230

118.7

1.42 x 10-2

-1.85

2.20

160

100.8

1.20 x 10-2

-1.92

2.12

132

240

197.6

2.36 x 10-2

-1.63

2.46

288

167.4

2.00 x 10-2

-1.70

2.38

273

Table 2: Vapour pressure of the test substance

Temperature

[°C]

log PT

log PT

PT

[mm Hg]

20

-7.68

2.1 x 10-8

1.6 x 10-10

25

-7.280

5.2 x 10-8

3.9 x 10-10

 

Conclusions:
The isothermal TGA effusion method was applied for the determination of the vapour pressure of the test material
The vapour pressure of the test substance at 20°C (293K) and 25°C (298K) was 2.1 x 10^-8 at 20 ºC and 5.2 x 10^-8 at 25 ºC.
Executive summary:

The isothermal TGA effusion method was applied for the determination of the vapour pressure of the test material. The test was conducted according to OECD 104 and EU method A.4. The test was conducted to GLP standard.

The vapour pressure of the test substance at 20°C (293K) and 25°C (298K) was 2.1 x 10-8 at 20 ºC and 5.2 x 10-8 at 25 ºC.

Description of key information

The vapour pressure of the test substance at:

20°C (293K) was 2.1 x 10^-8 Pa

25°C (298K) was 5.2 x 10^-8 Pa

Key value for chemical safety assessment

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

Additional information

The isothermal TGA effusion method was applied for the determination of the vapour pressure of the test material. The test was conducted according to OECD 104 and EU method A.4. The test was conducted to GLP standard.

The vapour pressure of the test substance at 20°C (293K) and 25°C (298K) was 2.1 x 10-8 at 20 ºC and 5.2 x 10-8 at 25 ºC.