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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:
27 September 2016 to 20 February 2017
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
The measured vapour pressures are outside the measuring range of the vapour pressure balance. Nevertheless as the vapour pressure values above 1 Pa could be detected properly by the vapour pressure balance, the values can be used for the evaluation.
Reference:
Composition 0
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
GLP compliance:
no
Type of method:
effusion method: vapour pressure balance
Test material information:
Composition 1
Key result
Temp.:
20 °C
Vapour pressure:
2 Pa
Key result
Temp.:
25 °C
Vapour pressure:
3.4 Pa
Key result
Temp.:
50 °C
Vapour pressure:
33 Pa
Transition / decomposition:
no

Thermal Stability results

In the temperature range of 40 - 70 °C an endothermic effect (melting), was observed. No further thermal effects were observed up to the maximum test temperature of 300 °C.

 

Effusion method: Vapour pressure balance results

The vapour pressure was measured in the temperature range of 27 to 58 °C. The measured vapour pressure values together with the measured temperatures are listed in the following table.

 

 Results of the Effusion method

No.

Temperature / °C

Vapour pressure / Pa

1

27

4.19 × 100

2

32

6.17 × 100

3

38

1.37 × 101

4

43

1.51 × 101

5

48

2.69 × 101

6

53

4.59 × 101

7

58

1.07 × 102

 

The measured vapour pressures are outside the measuring range (10 -3 to 1 Pa) of the vapour pressure balance. Nevertheless as the vapour pressure values above 1 Pa could be detected properly by the vapour pressure balance, the values 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 to

A = 13.3737

B = -3830.91

 

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

2.0 × 100

25

3.4 × 100

50

3.3 × 101

 

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 2.0, 3.4 and 33 Pa, respectively.

Conclusions:
Vapour pressure values of 2.0 Pa (at 20 °C), 3.4 Pa (at 25 °C) and 33.0 Pa (at 50 °C) were determined for the test substance according to E.U. Method A.4.

Description of key information

Vapour pressure: 2.0 Pa at 20 °C, 3.4 Pa at 25 °C, and 33.0 Pa at 50 °C (EU Method A.4, effusion method: vapour pressure balance)

Key value for chemical safety assessment

Vapour pressure:
3.4 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.

The measured vapour pressures were outside the measuring range of the vapour pressure balance. Nevertheless as the vapour pressure values above 1 Pa could be detected properly by the vapour pressure balance, the values were used for the evaluation.