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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:
2017-11-01 to 2018-02-15
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
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: vapour pressure balance
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Key result
Temp.:
50 °C
Vapour pressure:
0 Pa

The vapour pressure was measured in the temperature range of 85 °C to 110 °C. The measured vapour pressures at the corresponding temperatures are listed in the table below. The mass of test item was determined (with Sartorius R200D) before and after the vapor pressure measurement. After the measurement a mass loss of approx. 2 % (w/w) was determined.

Temperature / °C

Vapour pressure / hPa

85

2.7 × 10-5

90

1.6 × 10-5

95

1.7 × 10-5

100

1.2 × 10-5

105

1.0 × 10-5

110

1.1 × 10-5

The data points measured at 85 °C, 90 °C, 95 °C and 100 °C showed a typical deviation possibly caused by volatile impurities at the beginning of a measurement. The test item showed an unusual vapor pressure behaviour during the measurement. All values were close to the method detection limit (1 × 10E-5 hPa). The unusual behaviour did not influence the final results.

The values for 20 °C, 25 °C and 50 °C were estimated according to the Antoine equation.

Conclusions:
The vapour pressure of the test item was determined according to the OECD guidline 104 by effusion method using a vapour pressure balance. The vapour pressure was measured in the temperature range of 85 °C to 110 °C. However, the measured values were close to the detection limit and therefore the vapour pressures for 20 °C, 25 °C and 50 °C were estimated using Antoine equation:
20 °C: < 1 x 10E-5 Pa;
25 °C: < 1 x 10E-5 Pa;
50 °C: < 1 x 10E-4 Pa.
Executive summary:

The vapour pressure of the test item was determined according to the OECD guidline 104 by effusion method using a vapour pressure balance. The vapour pressure was measured in the temperature range of 85 °C to 110 °C. However, the measured values were close to the detection limit and therefore the vapour pressures for 20 °C, 25 °C and 50 °C were estimated using Antoine equation:

20 °C: < 1 x 10E-5 Pa;

25 °C: < 1 x 10E-5 Pa;

50 °C: < 1 x 10E-4 Pa.

Description of key information

The vapour pressure of the test item was determined according to the OECD guidline 104 by effusion method using a vapour pressure balance. The vapour pressure was measured in the temperature range of 85 °C to 110 °C. However, the measured values were close to the detection limit and therefore the vapour pressures for 20 °C, 25 °C and 50 °C were estimated using Antoine equation:

20 °C: < 1 x 10E-5 Pa;

25 °C: < 1 x 10E-5 Pa;

50 °C: < 1 x 10E-4 Pa.

Key value for chemical safety assessment

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

Additional information