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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
11 Nov 2014 - 12 Nov 2014
Reliability:
1 (reliable without restriction)
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: by loss of weight or by trapping vaporisate
Test no.:
#1
Temp.:
30 °C
Vapour pressure:
0.006 Pa
Remarks on result:
other: RSD P (%): 14.4%
Test no.:
#2
Temp.:
45 °C
Vapour pressure:
0.021 Pa
Remarks on result:
other: RSD P (%): 12.9%
Test no.:
#3
Temp.:
60 °C
Vapour pressure:
0.076 Pa
Remarks on result:
other: RSD P (%): 7.5%
Test no.:
#4
Temp.:
75 °C
Vapour pressure:
0.283 Pa
Remarks on result:
other: RSD P (%): 10.2%

The vapour pressure of the test item was examined at four different temperatures. All temperatures could be evaluated as they showed reproducible weight loss. For these temperatures, 1/T was plotted against log (P).

Table: Vapour Pressures (Effusion Method)

Vapour pressures (Effusion Method)

Experiment

 T  P  Stand. Dev. P  RSD P
 No.

 °C

 Pa

 Pa

 %

 1

30.0

 6.16E-03

8.86E-04

14.4% 

 2

45.0

 2.13E-02

2.74E-03

12.9%

3

60.0

7.61E-02

5.74E-03

7.5%

4

75.0

 2.83E-01

2.90E-02

10.2%

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

 

The graph 1/T vs. log (P) shows a straight line with a correlation coefficient of - 0.9985, showing good repeatability and precision. Therefore the determination is considered valid.

 

For the test item, the following vapour pressures at 20 °C and at 25 °C were calculated from the regression equation:

Vapour pressure at 20 °C: 2.08* 10-03Pa

Vapour pressure at 25 °C: 3.47* 10-03Pa



Conclusions:
For the test item SUPRASEC 2018PPF, the following vapour pressures at 20 °C and at 25 °C were calculated from the regression equation:
Vapour pressure at 20 °C: 2.08 * 10-03 Pa
Vapour pressure at 25 °C: 3.47 * 10-03 Pa

Description of key information

The following vapour pressures at 20 °C and at 25 °C were calculated from the regression equation:
Vapour pressure at 20 °C: 2.08 * 10-03 Pa
Vapour pressure at 25 °C: 3.47 * 10-03 Pa

Key value for chemical safety assessment

Additional information

The vapour pressure of the test item was determined following EU A.4 using the effusion method (weight loss). For the test item, the following vapour pressures at 20 °C and at 25 °C were calculated from the regression equation:

Vapour pressure at 20 °C: 2.08* 10-03Pa

Vapour pressure at 25 °C: 3.47* 10-03Pa