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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:
2018-08-23 to 2018-09-12
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
March 23, 2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
March 04, 2016
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
August 1996
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: isothermal thermogravimetry
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.7 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
1.1 Pa
Transition / decomposition:
no

Results

A representative weight loss curve of the test item is shown in the illustration attached below (Figure 4). The results of the isothermal TGA analysis for the test item and the vapour pressure at 20°C and 25°C are given in Table 3 and Table 4.

Table 3: Results of the Vapour pressure Isothermal TGA Analysis

Temperature
[°C]

Weight loss
[µg/min]

¿T
[g/cm2/h]

log¿T

logPT

PT
[Pa]

60

6.85301

8.18 x 10-4

-3.09

1.19

15

 

6.46197

7.71 x 10-4

-3.11

1.15

14

70

10.0495

1.20 x 10-3

-2.92

1.40

25

 

9.19479

1.10 x 10-3

-2.96

1.35

22

80

17.0256

2.03 x 10-3

-2.69

1.69

49

 

15.5848

1.86 x 10-3

-2.73

1.64

44

90

27.6892

3.31 x 10-3

-2.48

1.96

92

 

26.0330

3.11 x 10-3

-2.51

1.93

85

Table 4: Vapour Pressure of the Test Item

Temperature
[°C]

logPT

PT
[Pa]

PT
[mm Hg]

20

-0.16

0.70

5.2 x 10-3

25

0.02

1.1

7.9 x 10-3

The vapour pressure regression curve of the log P_T of the test item as a function of the reciprocal temperatures is shown in the illustration attached below (Figure 5). The equation of the curve was:

log P_T = -3163 x 1/T + 10.63 (r = 0.993, n = 8) (T given in K).

Conclusions:
Vapour pressure at 20 °C / 25 °C (thermogravimetric effusion method; OECD 104): 0.7 Pa / 1.1 Pa
Executive summary:

In a reliable study performed according to relevant guidelines (e.g. OECD 104) compliant with GLP the vapour pressure was determined for the submission substance applying the isothermal thermogravimetric effusion method, with the following results:

Vapour pressure at 20 °C / 25 °C (thermogravimetric effusion method; OECD 104): 0.7 Pa / 1.1 Pa

Description of key information

Vapour pressure at 20 °C / 25 °C (thermogravimetric effusion method; OECD 104): 0.7 Pa / 1.1 Pa

Key value for chemical safety assessment

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

Additional information

In a reliable study performed according to relevant guidelines (e.g. OECD 104) compliant with GLP the vapour pressure was determined for the submission substance applying the isothermal thermogravimetric effusion method, with the following results:

Vapour pressure at 20 °C / 25 °C (thermogravimetric effusion method; OECD 104): 0.7 Pa / 1.1 Pa