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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 2017-06-30 to 2017-07-01
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
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa
Temp.:
25 °C
Vapour pressure:
0 Pa

The vapour pressure was measured in the temperature range of 40 to 130 °C. For the evaluation the vapour pressure values in the range of 80 to 120 °C were used. The measured vapour pressure values together with the measured temperatures are listed in Table 1.

Table 1: Results of Effusion method

Stage no. Temperature
(°C)		 Δm/Δt
(mg/min)		 Vapour pressure
(Pa)
1 80 4.6729 x 10-6 1.3335 x 10-3
2 90 9.4595 x 10-5 2.7373 x 10-2
3 100 1.4116 x 10-3 4.1407 x 10-1
4 110 1.3628 x 10-2 4.0507
5 120 8.5632 x 10-2 25.783
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.
- for 20 °C: 3.648E-12 Pa
- for 25 °C: 2.615E-11 Pa
Executive summary:

A study was conducted according to OECD TG 104 and Regulation (EC) No 440/2008 method A.4 in order to determine the vapour pressure of the test item. The vapour pressure was determined at temperatures from 40 to 130 °C using the effusion method (Knudsen cell). The used temperatures were below the melting point range of the test item (204 to 205 °C according to literature). For the evaluation the vapour pressure values in the range of 80 to 120 °C were used. The vapour pressure of the test item was determined by extrapolation of the measured vapour pressure curve for the temperatures 20 °C with 3.648 x 10-12 Pa and 25 °C with 2.615 x 10-11 Pa.

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.

- for 20 °C: 3.648 x 10-12 Pa

- for 25 °C: 2.615 x 10-11 Pa

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 and Regulation (EC) No 440/2008 method A.4 in order to determine the vapour pressure of the test item. The vapour pressure was determined at temperatures from 40 to 130 °C using the effusion method (Knudsen cell). For the evaluation the vapour pressure values in the range of 80 to 120 °C were used. The melting range of the test item was 204 to 205 °C according to literature. The vapour pressure of the test item was determined by extrapolation of the measured vapour pressure curve for the temperatures 20 °C with 3.648 x 10-12 Pa and 25 °C with 2.615 x 10-11 Pa (reference 4.6-1).