Registration Dossier

Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
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:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
liquid

Results and discussion

Vapour pressureopen allclose all
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
< 0 Pa
Test no.:
#1
Temp.:
25 °C
Vapour pressure:
< 0 Pa

Any other information on results incl. tables

Weight loss was observed from the start of the study, and was probably due to evaporation of volatile components. In the range of 40°C and 70°C a log p versus 1/T curve for the test item could not be determined since the coefficient of correlation (r) was < 0.99. This is most likely due to the composition of the test item (test item is a UVCB).  

Since no accurate vapour pressure could be calculated from the obtained results, the weight losses were compared with the results of naphthalene. Since the weight loss of the test item was lower than the weight loss of the reference compound the vapour pressure of the test item is considered to be lower than that of naphthalene.

From 200°C upwards, an increase of weight loss was observed, probably due to reaction and/or decomposition.  In the range of 200°C and 230°C a log p versus 1/T curve for the test item could not be determined since the coefficient of correlation (r) was < 0.99.

Since no accurate vapour pressure could be calculated from the obtained results, the weight losses were compared with the results of benzo(ghi)perylene at the same temperatures. Since the weight loss of the test item was lower than the weight loss of the reference compound the vapour pressure of the non-volatile part of the test item is considered to be lower than that of benzo(ghi)perylene.

Applicant's summary and conclusion

Conclusions:
The isothermal TGA effusion method was applied to determine the vapour pressure of the test substance. The vapour pressure was determined to be lower than that of the lowest reference substance used on study for the major components.