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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:
24 December 2015 to 22 March 2016
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: guideline study under GLP, determinations were done at a temperature where decomposition was observed in the melting/boiling point test
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
GLP compliance:
yes
Type of method:
other: isothermal thermogravimetric effusion
Key result
Temp.:
20 °C
Vapour pressure:
< 0 Pa
Remarks on result:
other: smaller than the vapour pressure of the reference compound benzo(ghi)perylene.
Key result
Temp.:
25 °C
Vapour pressure:
< 0 Pa
Remarks on result:
other: smaller than the vapour pressure of the reference compound benzo(ghi)perylene.

 

Results of the isothermal TGA analysis

Temperature
[°C]

Weight loss
[µg/min]

νT
[g/cm2/h]

logνT

logPT

PT
[Pa]

210

3.439

4.11´10-4

-3.39

0.69

4.9

 

3.439

4.11´10-4

-3.39

0.69

4.9

220

6.799

8.12´10-4

-3.09

1.03

11

 

7.336

8.76´10-4

-3.06

1.07

12

230

14.66

1.75´10-3

-2.76

1.42

27

 

15.75

1.88´10-3

-2.73

1.46

29

240

31.42

3.75´10-3

-2.43

1.81

65

 

33.55

4.00´10-3

-2.40

1.85

70

Calculated vapour pressure of the test item

Temperature
[°C]

logPT

PT
[Pa]

PT
[mm Hg]

20

-12.02

9.5´10-13

7.1´10-15

25

-11.48

3.3´10-12

2.5´10-14

Conclusions:
The vapour pressure of the substance is <1.3E-08 Pa at 20°C
Executive summary:

The vapour pressure of the substance was determined using the isothermal thermogravimetric effusion method. As the results obtained were outside the validation interval of the method, it was concluded that the vapour pressure is smaller than the vapour pressure of the reference compound benzo(ghi)perylene. Thus the vapour pressure of the substance is <1.3E-08 Pa at 20°C.

Description of key information

The vapour pressure of the substance was determined using the isothermal thermogravimetric effusion method. As the results obtained were outside the validation interval of the method, it was concluded that the vapour pressure is smaller than the vapour pressure of the reference compound benzo(ghi)perylene. Thus the vapour pressure of the substance is <1.3E-08 Pa at 20°C.

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
20 °C

Additional information

For risk assessment purposes the value is set at the minimum validated value in the EUSES program (1E-06 Pa).