Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Vapour pressure

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
19 January to 29 March 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
1996
GLP compliance:
no
Type of method:
effusion method: Knudsen cell
Temp.:
20 °C
Vapour pressure:
0.16 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0.26 Pa
Temp.:
50 °C
Vapour pressure:
2.5 Pa

Thermal stability test results

In the temperature range of 70 - 90 °C an endothermic effect (melting), was observed. No further thermal effects were observed up to the maximum test temperature of 300 °C.

 

Vapour pressure test results

The vapour pressure was measured in the temperature range of 20 to 46 °C. The measured vapour pressure values together with the measured temperatures are listed in the following table.

 

No.

Temperature / °C

Vapour pressure / Pa

1

20

0.175

2

25

0.251

3

30

0.394

4

35

0.708

5

41

1.130

6

46

1.760

 

The measured vapour pressure is slightly outside the measuring range (0.001 to 1 Pa) of the Knudsen cell. Nevertheless, as the vapour pressure value above 1 Pa could be detected properly by the Knudsen cell, this value can be used for the evaluation.

From the measured data points of the vapour pressure curve the constants A and B of the Antoine equation can be derived by regression of the data points:

 

A = 12.1567

B = -3800.43

 

The vapour pressure values of the test item calculated by interpolation and 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. Vapour Pressure and OECD Test Guideline 104 (2006) are shown in the table below.

 

Calculated vapour pressure values for 20, 25 and 50 °C

Temperature / °C

Vapour pressure / Pa

20

0.16

25

0.26

50

2.5

 

 

Final Results

The vapour pressure of the test item was calculated by interpolation and 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. Vapour Pressure and OECD Test Guideline 104 (2006). The resulting vapour pressures are 0.16, 0.26 and 2.5 Pa, respectively.

Conclusions:
Vapour pressure values of 0.16 Pa (at 20 °C), 0.26 Pa (at 25 °C) and 2.5 Pa (at 50 °C) were determined for the test substance according to E.U. Method A.4.

Description of key information

Vapour pressure: 0.16 Pa at 20 °C, 0.26 Pa at 25 °C, and 2.5 Pa at 50 °C (EU Method A.4, effusion method: Knudsen cell)

Key value for chemical safety assessment

Vapour pressure:
0.26 Pa
at the temperature of:
25 °C

Additional information

According to Regulation EC No. 440/2008 Method A.4, the vapour pressure values of the test item for the temperatures 20, 25 and 50 °C were calculated by extrapolation.