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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
15 January 2016 to 07 December 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Key result
Temp.:
20 °C
Vapour pressure:
0.006 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0.006 Pa

- The test was performed from 56 to 91 °C. The vapour pressure of the test material was 5.790×10^-03 Pa at 20 °C and 6.479×10^-03 Pa at 25 °C, extrapolated from the ln VP vs 1/T plot.

- IR analysis was not available at the time of testing; however, DSC thermograms from the control and tested material were compared with those of the untested and demonstrated no difference.

Tables 1 and 2: Vapour Pressure Calculations

Temperature (°C)

Crucible Weight

Vapour Pressure

1/T (K^-1)

Ln (VP)

Test 1 (mg)

Test 2 (mg)

Test 1 (Pa)

Test 2 (Pa)

Test 1

Test 2

56.0

54.843

53.703

1.099E-02

1.281E-02

3.038E-03

-4.511E+00

-4.357E+00

54.812

53.667

67.0

54.812

53.667

1.197E-02

1.777E-02

2.940E-03

-4.425E+00

-4.030E+00

54.789

53.633

78.0

54.789

53.633

1.428E-02

2.151E-02

2.848E-08

-4.249E+00

-3.839E+00

54.759

53.588

91.0

54.759

53.588

3.985E-02

2.596E-02

2.746E-03

-3.223E+00*

-3.651E+00

54.685

53.540

91.0

54.685

53.540

1.878E-02

2.251E-03

2.746E-03

-3.975E+00

-3.794E+00

54.654

53.503

*= Data excluded from the analysis (poor fit to graph)

 

Test

1/T vs Ln(VP)

Extrapolated VP (Pa)

Slope

Intercept

Correlation

20 °C

25 °C

1

-1.846E+03

1.051E+00

-9.749E-01

5.265E-03

5.851E-03

2

-2.064E+03

1.977E+00

-9.594E-01

6.316E-03

7.107E-03

Mean of Extrapolated Vapour Pressure

5.790E-03

6.479E-03

Conclusions:
Under the conditions of this study, the vapour pressure of the test material was 5.790×10^-3 Pa at 20 °C and 6.479×10^-3 Pa at 25 °C, extrapolated from the ln VP vs 1/T plot.
Executive summary:

The vapour pressure of the test material was investigated in accordance with the standardised guideline OECD 104, under GLP conditions.

Tests were conducted between 56 and 91 °C to ensure that test material remained in the liquid phase throughout the test period. The vapour pressures at 20 and 25 °C were then extrapolated from the vapour pressure-temperature plots. IR analysis was not available at the time of testing; however, DSC thermograms from the control and tested material were compared with those of the untested and demonstrated no difference.

Under the conditions of this study, the vapour pressure of the test material was 5.790×10^-3 Pa at 20 °C and 6.479×10^-3 Pa at 25 °C, extrapolated from the ln VP vs 1/T plot.

Description of key information

Under the conditions of this study, the vapour pressure of the test material was 5.790×10^-3 Pa at 20 °C and 6.479×10^-3 Pa at 25 °C, extrapolated from the ln VP vs 1/T plot.

Key value for chemical safety assessment

Vapour pressure:
0.006 Pa
at the temperature of:
25 °C

Additional information

The vapour pressure of the test material was investigated in accordance with the standardised guideline OECD 104, under GLP conditions. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

Tests were conducted between 56 and 91 °C to ensure that test material remained in the liquid phase throughout the test period. The vapour pressures at 20 and 25 °C were then extrapolated from the vapour pressure-temperature plots. IR analysis was not available at the time of testing; however, DSC thermograms from the control and tested material were compared with those of the untested and demonstrated no difference.

Under the conditions of this study, the vapour pressure of the test material was 5.790×10^-3 Pa at 20 °C and 6.479×10^-3 Pa at 25 °C, extrapolated from the ln VP vs 1/T plot.