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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 2018-03-16 to 2018-05-24
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose for cross-reference:
reference to same 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:
< 0.5 Pa
Remarks on result:
not determinable
Temp.:
25 °C
Vapour pressure:
< 0.5 Pa
Remarks on result:
not determinable
Temp.:
50 °C
Vapour pressure:
< 0.5 Pa
Remarks on result:
not determinable

The vapour pressure was measured in the temperature range of 125.9 to 150.9 °C.

Table 1: Results of Effusion method

No.

Temperature (°C)

Vapour pressure (Pa)

1

126.0

1.57 x 10-1

2

130.9

2.70 x 10-1

3

135.9

2.63 x 10-1

4

138.9

1.49 x 10-1

5

140.9

2.79 x 10-1

6

142.9

1.61 x 10-1

7

145.9

3.89 x 10-1

8

147.9

1.96 x 10-1

9

150.9

5.19 x 10-1

Due to the fact that the test item showed no proper linear correlation of the vapour pressure and the inverse temperature 1/T, the Antoine constants cannot be evaluated in the measured temperature range. Due to this result, the vapour pressure for the temperatures 20, 25 and 50 °C was estimated on the basis of the maximum measured vapour pressure of 5.19 x 10-1 Pa at a temperature of 150.9 °C to be <0.5 Pa.

Conclusions:
The vapour pressure of the test item was estimated to be <0.5 Pa at 20 °C.
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 using the effusion method (weight loss). The vapour pressure was determined within the temperature range of 125.9 to 150.9 °C. The test item showed no proper linear correlation of the vapour pressure and the inverse temperature 1/T. Thus, the vapour pressures for the temperatures 20, 25 and 50 °C could only be estimated. On the basis of the maximum measured vapour pressure of 5.19 x 10-1 Pa, determined for 150.9 °C a vapour pressure of <0.5 Pa was estimated for 20, 25 and 50 °C.

Description of key information

The vapour pressure of the test item was estimated to be <0.5 Pa at 20 °C.

Key value for chemical safety assessment

Vapour pressure:
0.5 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. The vapour pressure of the test item was determined using the effusion method (weight loss). The vapour pressure was determined within the temperature range of 125.9 to 150.9 °C. The test item showed no proper linear correlation of the vapour pressure and the inverse temperature 1/T. Thus, the vapour pressures for the temperatures 20, 25 and 50 °C could only be estimated. On the basis of the maximum measured vapour pressure of 5.19 x 10-1 Pa, determined for 150.9 °C a vapour pressure of <0.5 Pa was estimated for 20, 25 and 50 °C.