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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:
06 Apr to 30 Jun 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: vapour pressure balance
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Key result
Temp.:
50 °C
Vapour pressure:
0 Pa

Results

 

Thermal Stability

In the temperature range of 230 - 270 °C an endothermic effect was observed. The test was terminated at 300 °C.

 

Effusion method: Vapour pressure balance

The vapour pressure was measured in the temperature range of 148 to 199 °C. The measured vapour pressure values together with the measured temperatures are listed in the following table.

 

No.

Temperature / °C

Vapour pressure / Pa

1

148

8.18 × 10-4

2

158

9.15 × 10-4

3

179

1.32 × 10-3

4

189

1.57 × 10-3

5

199

1.90 × 10-3

 

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:

 

Log10 p = A + (B / T)

 

A, B = Antoine constants

p = vapour pressure in Pa

T = temperature in K

 

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

 

Temperature / °C

Vapour pressure / Pa

20

2.5 × 10-5

25

3.1 × 10-5

50

7.2 × 10-5

 

 

Final Results

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. Vapour Pressure and OECD Test Guideline 104 (2006). The resulting vapour pressures are 2.5 × 10-5, 3.1 × 10-5 and 7.2 × 10-5 Pa, respectively.

Conclusions:
Vapour pressure values of 2.5E-5 Pa (at 20 °C), 3.1E-5 Pa (at 25 °C) and 7.2E-5 Pa (at 50 °C) were determined for the test substance according to E.U. Method A.4.

Description of key information

Vapour pressure: 2.5E-5 Pa at 20 °C, 3.1E-5 Pa at 25 °C, and 7.2E-5 Pa at 50 °C (EU Method A.4, effusion method: vapour pressure balance)

Key value for chemical safety assessment

Vapour pressure:
0 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.