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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
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
GLP compliance:
no
Type of method:
effusion method: by loss of weight or by trapping vaporisate
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.005 Pa
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0.013 Pa
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
0.535 Pa
Test no.:
#4
Temp.:
55 °C
Vapour pressure:
1.06 Pa

Areas and transmission probability factors of the effusion orifices:

 Cell  length of the effusion orifice [mm]  Area of the effusion orifice [mm2] transmission probability factor
 1 0.0125 0.777  0.991
 0.0125  0.774  0.991
 3  0.0125  0.779  0.991

Measured results:

 Cell  T [°C]  t [s]  m [mg]  p [Pa]
 1  25.15  21338  1.55  1.49E-02
 2  25.15  21338  1.10  1.07E-02
 3  25.15  21338  1.38 1.33E-02
 1  25.06  63461  4.38  1.42E-02
 2  25.06  63461  3.79  1.23E-02
 3  25.06  63461  3.91  1.27E-02
 1  35.02  10958  2.77  5.29E-02
 2  35.02  10958  3.02  5.79E-02
 35.02  10958  3.43  6.53E-02
 1  44.84  5133 6.09   2.52E-01
 2  44.84  5133  7.22  3.00E-01
 3  44.84  5133  5.90 2.44E-01 

 

Conclusions:
Based on the measured results, the vapour pressure of the test item was calculated to be 5.52 x 10^-3 Pa at 20 °C and 5.35 x 10^-1 Pa at 50 °C.
Executive summary:

The vapour pressure of the test item was measured using the Knudsen effusion method (mass loss technique), according to the guidelines OECD 104 / EU A.4. The quality of the apparatus was previously verified with the measurement of well-known reference compounds. Experiments were performed at three temperatures between 25 °C and 45 °C. Based on the results, the vapour pressure of the test item was calculated to be 5.52 x 10^-3 Pa at 20 °C and 5.35 x 10^-1 Pa at 50 °C.

Description of key information

The vapour pressure of the test item was measured using the Knudsen effusion method (mass loss technique), according to the guidelines OECD 104 / EU A.4. The quality of the apparatus was previously verified with the measurement of well-known reference compounds. Experiments were performed at three temperatures between 25 °C and 45 °C. Based on the results, the vapour pressure of the test item was calculated to be 5.52 x 10^-3 Pa at 20 °C and 5.35 x 10^-1 Pa at 50 °C.

Key value for chemical safety assessment

Vapour pressure:
0.006 Pa
at the temperature of:
20 °C

Additional information