Registration Dossier

Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2004
Report date:
2004

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: vapour pressure balance

Test material

Constituent 1
Chemical structure
Reference substance name:
trans-1,4-bis(iodomethyl)cyclohexane
Cas Number:
83447-96-5
Molecular formula:
C8H14I2
IUPAC Name:
trans-1,4-bis(iodomethyl)cyclohexane

Results and discussion

Vapour pressureopen allclose all
Temp.:
20 °C
Vapour pressure:
0 hPa
Remarks on result:
other: The calculated vapour pressure values are extrapolated
Temp.:
25 °C
Vapour pressure:
0 hPa
Remarks on result:
other: The calculated vapour pressure values are extrapolated
Temp.:
50 °C
Vapour pressure:
0.002 hPa
Remarks on result:
other: The calculated vapour pressure values are extrapolated

Any other information on results incl. tables

The vapour pressure as a function of the inverse temperature showed an unusual course. In the temperature range 49 - 52 °C a sharp increase (step) was observed. This step could probably be explained by a physical transformation e.g. a change of the crystal modification. This course was verified by a second measurement. Due to this behaviour two regressions for different temperature ranges were performed.

The vapour pressure values for 20 and 25 °C were calculated, using the Antoine constants A, Band C of the regression for measured temperatures < 49°C. The vapour pressure value for 50 °C was calculated, using the Antoine constants A, Band C of the regression for measured temperatures > 52°C.

Applicant's summary and conclusion

Conclusions:
The calculated vapour pressure values are extrapolated:
P (20 °C) = 2.5 * 10 -6 hPa
p (25 °C) = 5.0 * 10 -6 hPa
p (50 °C) = 2.0 * 10 -3 hPa