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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:
From July 02, 2019 to July 18, 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Key result
Test no.:
#1
Temp.:
ca. 20 °C
Vapour pressure:
ca. 0 Pa
Remarks on result:
other: Calculated by extrapolation of the measured vapour pressure curve for temperature 20 deg C
Key result
Test no.:
#2
Temp.:
ca. 25 °C
Vapour pressure:
ca. 0 Pa
Remarks on result:
other: Calculated by extrapolation of the measured vapour pressure curve for temperature 25 deg C
Key result
Test no.:
#3
Temp.:
ca. 50 °C
Vapour pressure:
ca. 0 Pa
Remarks on result:
other: Calculated by extrapolation of the measured vapour pressure curve for temperature 50 deg C

Results

Thermal Stability

The DSC run PN18027 is shown in Figure 1 (kindly refer the attached background material section of the IUCLID). In the temperature range of 30 - 50 °C a first endothermic effect can be observed. A second endothermic effect was detected in the temperature range of 170 - 210 °C. The test was terminated at 300 °C.

 

Effusion method: Knudsen cell

The vapour pressure was measured in the temperature range of 100 to 125 °C. The measured vapour pressure values together with the measured temperatures are listed in below table:

Number

Temperature

(Deg C)

Vapour

pressure (Pa)

1

100

-

2

105

0.025

3

110

0.042

4

115

0.072

5

120

0.12

6

125

0.2

 

Figure 2 shows the vapour pressure as a function of the inverse temperature 1/T (kindly refer the attached background material section of the IUCLID). Segment No. 1 was not considered for the linear regression since water was evaporated from the test substance at the beginning of the examination.

The vapour pressure of the test substance was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50°C. The vapour pressure of the test substance was determined to be 1.4E-7 Pa, 3.5E-7 Pa and 2.0E-5 Pa at 20°C, 25°C and 50°C respectively.

Conclusions:
Under the study conditions, vapour pressure of the test substance was determined to be 1.4E-7 Pa, 3.5E-7 Pa and 2.0E-5 Pa at 20°C, 25°C and 50°C respectively.
Executive summary:

A study was conducted to determine the vapour pressure of the substance, using Knudsen cell Effusion method according to the OECD Guideline 104 and EU Method A.4, in compliance with GLP. Under the study conditions, vapour pressure of the test substance was determined to be 1.4E-7 Pa, 3.5E-7 Pa and 2.0E-5 Pa at 20°C, 25°C and 50°C respectively (Hartmann, 2019).

Description of key information

The vapour pressure of the test substance was determined using the Knudsen cell Effusion method according to OECD Guideline 104 and EU Method A.4 (Hartmann, 2019).

Key value for chemical safety assessment

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

Additional information

Vapour pressure: 1.4E-7 Pa, 3.5E-7 Pa and 2.0E-5 Pa at 20°C, 25°C and 50°C respectively.