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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
01 July 2011- 21 October 2011
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
(2009)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
(2006)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: by loss of weight or by trapping vaporisate
Remarks:
(Isothermal thermogravimetric effusion method)
Temp.:
20 °C
Vapour pressure:
1.9 other: E-10 Pa
Remarks on result:
other: 1.4E-12 mm Hg
Temp.:
25 °C
Vapour pressure:
5.6 other: E-10 Pa
Remarks on result:
other: 4.2E-12 mm Hg

A representative weight loss curve of the test substance is shown in Figure 7 (see attachment). The plot of the log PTof the test substance as function of the reciprocal temperatures is shown in Figure 8 (see attachment). Equation: log PT,20= -8212 x 1/T + 18.3 (r = 0.9998, n = 8).

Table:   Results of the isothermal TGA analysis

Temperature
[°C]

Weight loss
[µg/min]

νT
[g/cm2/h]

log νT

log PT

PT
[Pa]

 

 

 

 

 

 

210

18.98

2.27*10-3

-2.64

1.28

19.2

 

19.30

2.30*10-3

-2.64

1.29

19.5

 

 

 

 

 

 

220

38.51

4.60*10-3

-2.34

1.64

43.4

 

38.75

4.63*10-3

-2.33

1.64

43.7

 

 

 

 

 

 

230

75.33

8.99*10-3

-2.05

1.97

94.3

 

74.86

8.94*10-3

-2.05

1.97

93.7

 

 

 

 

 

 

240

139.1

1.66*10-2

-1.78

2.28

192

 

137.2

1.64*10-2

-1.79

2.28

189

 

 

 

 

 

 

log PT of the test substance at 20°C: -9.72; log PT of the test substance at 25°C: -9.25

Conclusions:
The vapour pressure of FDCA at 20°C is 1.9E-10 Pa.
The vapour pressure of FDCA at 25°C is 5.6E-10 Pa.

Description of key information

The vapour pressure of the substance is 5.6E-10 Pa  at 25°C (1.9E-10 Pa at 20°C)

Key value for chemical safety assessment

Additional information

Key value for CSA: 5.6E-10 Pa at 25°C

The isothermal thermogravimetric effusion method was performed in accordance with EC A.4 and OECD 104.