Registration Dossier

Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 18 Sep 2017 to 02 Nov 2017
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:
2009
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:
liquid: viscous
Details on test material:
- Physical appearance: dark brown viscous liquid
- Storage conditions: at room temperature

Results and discussion

Vapour pressureopen allclose all
Key result
Temp.:
20 °C
Vapour pressure:
< 7.56 Pa
Key result
Temp.:
25 °C
Vapour pressure:
< 11.5 Pa

Any other information on results incl. tables

The log PT versus 1/T curve for the substance over the range 30 -50°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 losses of the test item at 30°C, 40°C and 50°C were lower than the weight losses of reference substance napthalene at the same temperatures, it was concluded that vapour pressure of the substance at 20°C (25°C) is lower than the vapour pressure of napthalene at 20°C (25°C).

 

The observed weight losses from 50°C were slightly non-linear. The test item is a UVCB. Observed weight losses might have been slightly influenced by the loss of low-molecular-weight components or by reaction and/or decomposition of the test item. During the determination of the vapour pressure, the test item was kept at elevated temperatures for a longer time than during the melting and boiling temperature study. Reaction and/or decomposition might, therefore, have occurred at lower temperatures than during the determination of the melting and boiling point (i.e. 75°C).

Applicant's summary and conclusion

Conclusions:
The vapour pressure of the substance at 20°C was determined to be < 7.56 Pa.
The vapour pressure of the substance at 25°C was determined to be < 11.5 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.

From the measured weight losses in the temperature range 30 -50°C, the vapour pressure of the substance was determined to be lower than the vapour pressure of reference substance Napthalene.

The vapour pressure of the substance at 20°C and 25°C was concluded to be < 7.56 Pa and < 11.5 Pa, resp.