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EC number: 914-468-7 | CAS number: -
Vapour pressure
Administrative data
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 10 JUL 2009 to 30 MAR 2010
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Guideline study (OECD 104)
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 010
- Report date:
- 2010
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: vapour pressure balance
Test material
- Reference substance name:
- Reaction mass of Fatty acids, montan-wax and Montan wax
- EC Number:
- 914-468-7
- Molecular formula:
- R-CH2-COOH mainly
- IUPAC Name:
- Reaction mass of Fatty acids, montan-wax and Montan wax
- Details on test material:
- - Name of test material (as cited in study report): Licowax S
- Physical state: Solid (light yellowish flakes)
- Analytical purity: 99.8% (w/w)
- Storage condition of test material: Room temperature
Constituent 1
Results and discussion
Vapour pressure
- Temp.:
- 25 °C
- Vapour pressure:
- 0.003 Pa
Any other information on results incl. tables
The vapour pressure was measured in the temperature range of 22 °C to 113 °C. Above 42 °C a vapour pressure could be measured. The measured vapour pressures at the corresponding temperatures are listed in the following table:
Temperature / °C |
Vapour pressure / hPa |
42.1 |
1.8 x 10-5 |
47.3 |
4.9 x 10-5 |
50.1 |
7.8 x 10-5 |
58.0 |
2.5 x 10 -4 |
61.5 |
3.8 x 10-4 |
65.5 |
4.2 x 10-4 |
71.6 |
5.5 x 10-4 |
78.3 |
6.4 x 10-4 |
94.0 |
1.9 x 10 -3 |
103.1 |
2.4 x 10 -3 |
113.4 |
4.1 x 10-3 |
The measured data points at 42.1 °C, 47.3 °C and 50.1 °C were not used for the regression of the vapour pressure curve because no equation was arrived during the beginning of the melting of the test item. Therefore the regression is used to calculate the vapour pressure above 58 °C:
A curve is shown that gives the vapour pressure (Iogarithmic scale) as a function of the inverse temperature (1/T, T in Kelvin). For better readability the temperature is reported in a centigrade scale. The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C.
T/°C |
p/hPa |
log (p/hPa) = A + B/(C+T[°C]) |
20 |
2.32E-05 |
A = 4.60628 |
25 |
3.31E-05 |
B = -2708.94 |
50 |
1.67E-04 |
C = 273,15 |
Final Results
Vapour Pressure
The calculated vapour pressure values are extrapolated:
T / °C |
p/hPa |
p / Pa |
20 |
2.3 x 10 -5 |
2.3 x 10 -3 |
25 |
3.3 x 10 -5 |
3.3 x 10 -3 |
50 |
1.7 x 10 -4 |
1.7 x 10-2 |
Applicant's summary and conclusion
- Conclusions:
- The vapour pressure of the test substance is 0.0033 Pa at 25 °C.
- Executive summary:
The vapour pressure of the test substance was determined in a guideline study (OECD TG 104). The vapour pressure is 0.0033 Pa at 25 °C.
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