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EC number: 692-731-2 | CAS number: 76950-43-1
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 18 Feb-15 Apr 2014
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- Principles of method if other than guideline:
- The evaporation rate is calculated from the weight loss of the compound in the thermogravimetric analyser.
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- GLP Compliance Monitoring Program, Health Care Inspectorate, Ministry of Health, Welfare and Sport, Den Haag, The Netherlands
- Type of method:
- other: isothermal thermogravimetric effusion method
- Temp.:
- 20 °C
- Vapour pressure:
- <= 0.95 Pa
- Remarks on result:
- other: log P[Pa] <= -0.022
- Temp.:
- 25 °C
- Vapour pressure:
- <= 1.6 Pa
- Remarks on result:
- other: log P[Pa] <= 0.19
Reference
Results of the isothermal TGA analysis:
Temperature [°C] |
Weight loss [µg/min] |
vT[g/cm2/h] |
log vT |
log P |
P [Pa] |
80 |
58.96 |
7.04E-03 |
-2.15 |
2.15 |
1.4E+02 |
64.71 |
7.72E-03 |
-2.11 |
2.19 |
1.6E+02 |
|
85 |
80.61 |
9.62E-03 |
-2.02 |
2.30 |
2.0E+02 |
85.37 |
1.02E-02 |
-1.99 |
2.33 |
2.1E+02 |
|
90 |
108.9 |
1.30E-02 |
-1.89 |
2.45 |
2.8E+02 |
114.1 |
1.36E-02 |
-1.87 |
2.47 |
3.0E+02 |
|
95 |
144.9 |
1.73E-02 |
-1.76 |
2.59 |
3.9E+02 |
151.8 |
1.81E-02 |
-1.74 |
2.62 |
4.1E+02 |
The equation of the pressure-temperature curve: log P[Pa] = -3777*1/T[K] + 12.86 (r = 0.995, n = 8).
The weight losses of the test substance were obtained with a temperature program which started above the melting temperature of the test substance. Due to the low melting point of the test substance this cannot be avoided. As a result, the vapour pressure of the test substance (which was, according to the method, extrapolated to 20 °C and 25 °C) could be slightly overestimated.
Description of key information
<= 0.95 Pa at 20 °C; <= 1.6 Pa at 25 °C (EU A.4, OECD 104, OPPTS 830.7950; isothermal TGA effusion method)
Key value for chemical safety assessment
- Vapour pressure:
- 1.6 Pa
- at the temperature of:
- 25 °C
Additional information
The weight losses of the test substance were obtained with a temperature program which started above the melting temperature of the test substance. Due to the low melting point of the test substance this could not be avoided. As a result, the vapour pressure of the test substance (which was, according to the method, extrapolated to 20 °C and 25 °C) could be slightly overestimated.
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