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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:
27 February 2020 to 13 March 2020
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:
23 March 2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
4 March 2016
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry
Specific details on test material used for the study:
- Purity/Composition correction factor: No correction factor required
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.017 Pa
Key result
Test no.:
#1
Temp.:
25 °C
Vapour pressure:
0.031 Pa

The results of the isothermal TGA analysis for the test material and the vapour pressure at 20 and 25 °C are given below.

A representative weight loss curve of the test material as well as the vapour pressure regression curve of the log PT of the test material as function of the reciprocal temperatures are attached.

The equation of the vapour pressure regression curve of the log PT of the test material as function of the reciprocal temperatures was:

log PT = -4602 x 1/T + 13.93 (r = 0.996, n = 8).

Results of the Vapour Pressure Isothermal TGA Analysis

Temperature (°C)

Weight loss (µg/min)

νT (g/cm²/h)

log νT

log PT

PT (Pa)

60

0.91213

1.09 x10-4

-3.96

0.17

1.5

0.738905

8.82 x10-5

-4.05

0.06

1.2

70

2.02659

2.42 x10-4

-3.62

0.56

3.6

1.78414

2.13 x10-4

-3.67

0.49

3.1

80

4.35615

5.20 x10-4

-3.28

0.93

8.5

3.9631

4.73 x10-4

-3.33

0.88

7.7

90

8.93975

1.07 x10-3

-2.97

1.28

19

8.06959

9.63 x10-4

-3.02

1.23

17

Vapour Pressure of the Test Material

Temperature (°C)

log PT

PT (Pa)

PT (mm Hg)

20

-1.77

1.7 x10-2

1.3 x10-4

25

-1.50

3.1 x10-2

2.4 x10-4
Conclusions:
Under the conditions of the study, the vapour pressure of the test material was determined to be 0.017 and 0.031 Pa at 20 and 25 °C, respectively.
Executive summary:

The vapour pressure of the test material was investigated in a study which was conducted in accordance with the standardised guidelines OECD 104 and EU Method A.4, under GLP conditions, using the isothermal TGA effusion method.

Under the conditions of the study, the vapour pressure of the test material was determined to be 0.017 and 0.031 Pa at 20 and 25 °C, respectively.

Description of key information

Under the conditions of the study, the vapour pressure of the test material was determined to be 0.017 and 0.031 Pa at 20 and 25 °C, respectively.

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the test material was investigated in a study which was conducted in accordance with the standardised guidelines OECD 104 and EU Method A.4, under GLP conditions, using the isothermal TGA effusion method. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

Under the conditions of the study, the vapour pressure of the test material was determined to be 0.017 and 0.031 Pa at 20 and 25 °C, respectively.