Registration Dossier

Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 03 January 2018 to 31 January 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2018
Report Date:
2018

Materials and methods

Test guidelineopen allclose all
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

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid
Details on test material:
- Appearance: Light tan solid
- Storage conditions: At room temperature protected from light
Specific details on test material used for the study:
Decomposition during melting (at 195°C).

Results and discussion

Vapour pressureopen allclose all
Key result
Temp.:
20 °C
Vapour pressure:
< 0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
< 0 Pa

Any other information on results incl. tables

Table: Results of the Vapour pressure Isothermal TGA Analysis

Temperature
[°C]

Weight loss
[µg/min]

vT
[g/cm2/h]

log vT

log PT

PT
[Pa]

170

0.441252

5.27E-5

-4.28

-0.34

0.46

 

0.433758

5.18E-5

-4.29

-0.35

0.45

180

1.10311

1.32´E-4

-3.88

0.17

1.5

 

1.04389

1.25E-4

-3.90

0.14

1.4

190

6.40613

7.65E-4

-3.12

1.15

14

 

6.31915

7.54E-4

-3.12

1.14

14

 

The log PT versus 1/T curve for the substance over the range 170 -190°C showed poor linearity (correlation coefficient r < 0.99). 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 170°C, 180°C and 190°C was lower than the weight loss of reference substance chrysene at the same temperatures, it was considered that the vapour pressure of the substance at 20°C (25°C) is lower than the vapour pressure of chrysene at 20°C (25°C).

Applicant's summary and conclusion

Conclusions:
The vapour pressure of the substance at 20°C was determined to be <8.4E-7 Pa.
The vapour pressure of the substance at 25°C was determined to be <6.6E-7 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 170 -190°C showed poor linearity (correlation coefficient r < 0.99). 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 170 -190°C, the vapour pressure of the substance was determined to be lower than the vapour pressure of reference substance chrysene. The vapour pressure of the substance at 20°C and 25°C was concluded to be < 8.4E-7 Pa and < 6.6E-7 Pa, resp.