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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 2018-01-09 to 2018-03-01
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
no
Type of method:
dynamic method
Key result
Temp.:
20 °C
Vapour pressure:
0.03 hPa
Temp.:
25 °C
Vapour pressure:
0.04 hPa
Temp.:
50 °C
Vapour pressure:
0.21 hPa

The vapour pressure was measured in the temperature range of 142.4 to 189.8 °C.

No.

Temperature / °C

Vapour pressure / hPa

Remark

1

142.4

20.1

measured up

2

157.4

35.0

measured up

3

166.1

44.9

measured up

4

171.8

59.9

measured up

5

180.8

79.9

measured up

6

189.8

99.9

measured up

7

186.7

90.0

measured down

8

175.1

69.9

measured down

9

170.4

54.9

measured down

From the measured data points of the vapour pressure curve the constants A, B and C of the Antoine equationcan be derived by regression of the data points to

A = 10.2170

B = -2872.14

C = 273.15

The vapour pressure of the test item was calculated by extrapolationof the measured vapour pressure curve for the temperatures 20, 25 and 50 °C.

Temperature / °C

Vapour pressure / hPa

20

0.03

25

0.04

50

0.21

Conclusions:
The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C to be 0.03, 0.04 and 0.21 hPa, 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. A vapour pressure curve with 9 data points was measured over a pressure range between 20 to 100 hPa. For control 3 measuring points were evaluated with decreasing pressure. The vapour pressure was measured in the temperature range of 142.4 to 189.8 °C. From the measured data points of the vapour pressure curve the constants A, B and C of the Antoine equation were derived and the vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC No. 440/2008 Method A.4. The vapour pressure was determined to be 0.03 hPa at 20 °C, 0.04 hPa at 25 °C and 0.21 hPa at 50 °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, 25 and 50 °C to be 0.03, 0.04 and 0.21 hPa, respectively.

Key value for chemical safety assessment

Vapour pressure:
0.03 hPa
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. A vapour pressure curve with 9 data points was measured over a pressure range between 20 to 100 hPa. For control 3 measuring points were evaluated with decreasing pressure. The vapour pressure was measured in the temperature range of 142.4 to 189.8 °C. From the measured data points of the vapour pressure curve the constants A, B and C of the Antoine equation were derived and the vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC No. 440/2008 Method A.4. The vapour pressure was determined to be 0.03 hPa at 20 °C, 0.04 hPa at 25 °C and 0.21 hPa at 50 °C, respectively.