Registration Dossier

Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
09.-31.08.2017
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 guideline
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: Knudsen cell

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: granular

Results and discussion

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

Applicant's summary and conclusion

Conclusions:
Based on the findings the vapor pressure is determined at 20 °C at 2.3E-04 Pa.
Executive summary:

The vapour pressure of1,1'-Azobis(cyclohexane-1-carbonitrile)was determinedaccording to OECD 104 resp.EU A.4 using the effusion method (weight loss).

 

Vapour pressure was examined at five different temperatures. Four temperatures could be evaluated as they showed reproducible weight loss. For these temperatures, 1/T was plotted against log (p).

Table3‑a         Vapour Pressures (Effusion Method)

Experiment

T

Mean p

Stand. Dev. p

RSD p

No.

K

Pa

Pa

%

1

303.2

1.06E-03

2.58E-04

24.3 %

2

318.2

1.18E-02

8.35E-04

7.1 %

3

333.2

8.09E-02

4.34E-03

5.4 %

4

348.2

4.65E-01

3.59E-02

7.7 %

In this table, E-0X represents multiplication with 10-x.

Stand. Dev. = Standard Deviation; RSD = Relative Standard Deviation

The graph 1/T vs. log (p) shows a straight line with a correlation coefficient of - 0.9994.

 

For the test item1,1'-Azobis(cyclohexane-1-carbonitrile), the following vapour pressures at 20 °C and at 25 °C were calculated from the regression equation:

Vapour pressure at 20 °C:               2.30* 10-04Pa

Vapour pressure at 25 °C:               5.19* 10-04Pa