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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 2017-03-29 to 2017-04-12
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
Temp.:
20 °C
Vapour pressure:
0.003 Pa
Temp.:
25 °C
Vapour pressure:
0.006 Pa

The vapour pressure was measured in the temperature range of 50 to 130 °C. For the evaluation the vapour pressure values in the range of 50 to 100 °C were used. The test item melting point is determined to be 153.5 °C (refer to IUCLID Section 4.2 "Melting point / Freezing point").

Stage No.

Temperature, °C

Δm/Δt, mg/min

Vapour pressure, Pa

1

50

3.2819 x 10-4

8.9280 x 10-2

2

60

8.5638 x 10-4

2.3655 x 10-1

3

70

1.9288 x 10-3

5.4071 x 10-1

4

80

5.9312 x 10-3

1.6867

5

90

1.1614 x 10-2

3.3494

6

100

2.2760 x 10-2

6.6533
Conclusions:
The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C:
Vapour pressure at 20 °C: 3.128E-3 Pa
Vapour pressure at 25 °C: 5.728E-3 Pa
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 temperatures between 50 and 130 °C using the effusion method (Knudsen cell). For the evaluation the vapour pressure values in the range of 50 to 100 °C were used. The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C. The vapour pressure was calculated to be 3.128E-03 Pa at 20 °C and 5.728E-03 Pa at 25 °C, respectively.

Description of key information

The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C:

Vapour pressure at 20 °C: 3.128E-3 Pa

Vapour pressure at 25 °C: 5.728E-3 Pa

Key value for chemical safety assessment

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

Additional information

A study (reference 4.6-1) 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 temperatures between 50 and 130 °C using the effusion method (Knudsen cell). For the evaluation the vapour pressure values in the range of 50 to 100 °C were used. The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C. The vapour pressure was calculated to be 3.128E-03 Pa at 20 °C and 5.728E-03 Pa at 25 °C, respectively.