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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:
12 December 2015 - 23 May 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2009
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
1996
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry
Specific details on test material used for the study:
Melting temp: 35°C
Key result
Temp.:
25 °C
Vapour pressure:
<= 0.053 Pa
Remarks on result:
other: reported as less than or equal to value because determined using data obtained above the melting point (and therefore overestimated). At temperatures below the melting point of the test item, no significant weight loss was observed.
Key result
Temp.:
20 °C
Vapour pressure:
<= 0.028 Pa

Table: Results of the isothermal TGA analysis (test substance)

Temperature
[°C]

Weight loss
[µg/min]

νT
[g/cm2/h]

logνT

logPT

PT
[Pa]

 

 

 

 

 

 

70

4.983

5.95E-04

-3.23

0.87

7.4

 

4.941

5.90E-04

-3.23

0.87

7.3

 

5.243

6.26E-04

-3.20

0.90

7.9

 

 

 

 

 

 

75

7.411

8.85E-04

-3.05

1.07

12

 

7.402

8.84E-04

-3.05

1.07

12

 

7.652

9.13E-04

-3.04

1.08

12

 

 

 

 

 

 

80

11.04

1.32E-03

-2.88

1.26

18

 

10.83

1.29E-03

-2.89

1.26

18

 

11.44

1.37E-03

-2.86

1.28

19

 

 

 

 

 

 

85

16.33

1.95E-03

-2.71

1.46

29

 

16.68

1.99E-03

-2.70

1.47

29

 

17.48

2.09E-03

-2.68

1.49

31

 

 

 

 

 

 
Conclusions:
The vapour pressure at 25°C was determined to be <= 0.053 Pa.
The vapour pressure at 20°C was determined to be <= 0.028 Pa.
Executive summary:

The vapour pressure of the substance was determined using the isothermal thermogravimetric effusion method in a GLP study according to EC A.4, OECD 104 and OPPTS 830.7950. Measurements were performed at temperatures above the melting temperature of the solid substance. The vapour pressures at 20°C and 25°C were calculated by extrapolation and therefore reported as <= values. The vapour pressure at 25°C was determined to be <= 0.053 Pa. The vapour pressure at 20°C was determined to be <= 0.028 Pa.

Description of key information

The vapour pressure of the substance was determined to be <= 0.053 Pa at 25°C.

Key value for chemical safety assessment

Additional information

Determined using the isothermal thermogravimetric effusion method in a GLP study according to EC A.4, OECD 104 and OPPTS 830.7950. Measurements were performed at temperatures above the melting temperature of the solid substance. The vapour pressure was calculated by extrapolation and therefore reported as <= value.