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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:
08.09.2017 to 09.09.2017
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
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 Pa
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0.001 Pa

The vapour pressure was measured in the temperature range of 105 to 146 °C. For the evaluation the vapour pressure values in the range of 110 to 130 °C were used. As the melting point of the test item is in the range of 140 - 149 °C (refer to IUCLD Section 4.2 "Melting point / freezing point"), a vapour pressure at this temperatures is technically not possible to be measured. The measured vapour pressure values together with the measured temperatures are listed below.

  

Stage No.

Temperature, °C

Δm/Δt, mg/min

Vapour pressure, Pa

1

110

1.1492 x 10-4

2.9734 x 10-2

2

114

1.2320 x 10-4

3.2042 x 10-2

3

118

1.3910 x 10-4

3.6365 x 10-2

4

122

1.6520 x 10-4

4.3408 x 10-2

5

126

1.7579 x 10-4

4.6424 x 10-2

6

130

2.2059 x 10-4

5.8546 x 10-2

 

Conclusions:
The vapour pressure at 20 and 25 °C was extrapolated from the experimental data to be 4.597E-4 and 6.172E-4 Pa, respectively.
Executive summary:

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined at temperature range 110 to 130 °C using the effusion method (Knudsen cell). The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The vapour pressure at 20 and 25 °C was extrapolated from the experimental data to be 4.597E-4 and 6.172E-4 Pa, respectively.

Description of key information

The vapour pressure at 20 and 25 °C was extrapolated from the experimental data to be 4.597E-4  and 6.172E-4 Pa, respectively.

Key value for chemical safety assessment

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

Additional information

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item (reference 4.6-1). The vapour pressure of the test item was determined at temperature range 110 to 130 °C using the effusion method (Knudsen cell). The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The vapour pressure at 20 and 25 °C was extrapolated from the experimental data to be 4.597E-4 and 6.172E-4 Pa, respectively.