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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 2017-04-21 to 2017-04-29
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)
Remarks:
TOXI-COOP Toxicological Research Center Zrt., H-8230 Balatonfüred, Arácsi u. 97-99, Hungary (+ 5 further addresses)
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 115 to 165 °C. For the evaluation the vapour pressure values in the range of 120 to 160 °C were used.

Table 1. Results of the effusion method

Stage No.

Temperature, °C

Δm/Δt, mg/min

Vapour pressure, Pa

1

120

6.5504 x 10-5

1.5550 x 10-2

2

125

6.8468 x 10-5

1.6357 x 10-2

3

130

1.0423 x 10-4

2.5055 x 10-2

4

135

1.9607 x 10-4

4.7424 x 10-2

5

140

4.3333 x 10-4

1.0545 x 10-1

6

145

1.4739 x 10-3

3.6084 x 10-1

7

150

*

*

8

155

3.3760 x 10-3

8.3632 x 10-1

9

160

6.1230 x 10-3

1.5257

* outlier, not used for the calculations

Vapour pressure of test item:

7.367E-11 Pa at 20.0 °C

2.518E-10 Pa at 25.0 °C

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: 7.367E-11 Pa
Vapour pressure at 25 °C: 2.518E-10 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 of the test item was determined at temperatures between 115 and 165 °C using the effusion method (Knudsen cell). For the evaluation the vapour pressure values in the range of 120 to 160 °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 7.367E-11 Pa at 20 °C and 2.518E-10 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: 7.367 x 10-11 Pa

Vapour pressure at 25 °C: 2.518 x 10-10 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 (reference 4.6-1). The vapour pressure of the test item was determined at temperatures between 115 and 165 °C using the effusion method (Knudsen cell). For the evaluation the vapour pressure values in the range of 120 to 160 °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 7.367 x 10-11 Pa at 20 °C and 2.518 x 10-10 Pa at 25 °C, respectively.