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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:
15 November 2017 - 22 December 2017
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2016
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to
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:
Decomposition temp.: 75°C
Key result
Temp.:
20 °C
Vapour pressure:
< 0.002 Pa
Key result
Temp.:
25 °C
Vapour pressure:
< 0.004 Pa

Table: Results of the isothermal TGA analysis

Temperature [°C]

Weight loss [µg/min]

νT

[g/cm2/h]

log νT

log PT

PT[Pa]

100

5.60533

6.69×10-4

-3.17

1.07

12

 

3.71395

4.43×10-4

-3.35

0.84

7.0

110

5.97899

7.14×10-4

-3.15

1.11

13

 

3.37464

4.03×10-4

-3.39

0.79

6.2

120

13.6007

1.62×10-3

-2.79

1.57

37

 

10.0253

1.20×10-3

-2.92

1.40

25

The log PT versus 1/T curve for the substance over the range 100 - 120°C showed poor linearity (correlation coefficient r < 0.99), probably due to decomposition of the substance. Extrapolation of the curve to 20°C or 25°C would not give reliable results for the vapour pressure of the substance at these temperatures.Since the weight loss of the test item at 100°C, 110°C, and 120°C was lower than the weight loss of reference substance hexachlorobenzene at the same temperatures, it was considered that vapour pressure of the substance at 20°C (25°C) is lower than the vapour pressure of hexachlorobenzene at 20°C (25°C).

Conclusions:
The vapour pressure of the substance at 20°C was determined to be <1.5E-3 Pa.
The vapour pressure of the substance at 25°C was determined to be <4.0E-3 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.

The constants specific for the experimental arrangement were determined using a set of 5 reference compounds. The log PT versus 1/T curve for the substance over the range 100 -120°C showed poor linearity (correlation coefficient r < 0.99), probably due to decomposition of the substance. Extrapolation of the curve to 20°C or 25°C would not give reliable results for the vapour pressure of the substance at these temperatures. From the measured weight losses in the temperature range 100 -120°C, the vapour pressure of the substance was determined to be lower than the vapour pressure of reference substance hexachlorobenzene. The vapour pressure of the substance at 20°C and 25°C was concluded to be < 1.5E-3 Pa and < 4.0E-3 Pa, resp.

 

Description of key information

The vapour pressure of the substance at 20°C was determined to be <1.5E-3 Pa.

The vapour pressure of the substance at 25°C was determined to be <4.0E-3 Pa.

Key value for chemical safety assessment

Additional information

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.