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EC number: 914-459-8 | CAS number: -
Vapour pressure
Administrative data
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 12 Jan to 14 Apr 2011
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Guideline study (EU A.4; OECD 104)
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 011
- Report date:
- 2011
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:
- Montan waxes, type CaV 102
- IUPAC Name:
- Montan waxes, type CaV 102
- Details on test material:
- - Name of test material (as cited in study report): Licomont CaV 102 Fine Grain
- Physical state: Solid (beige fine grain powder)
- Storage conditions: room temp., dry
Constituent 1
Results and discussion
Vapour pressure
- Temp.:
- 25 °C
- Vapour pressure:
- 0 Pa
Any other information on results incl. tables
The vapour pressure was measured in the temperature range of 20 °C to 134 °C. Above 60 °C a vapour pressure could be measured. The measured vapour pressures at the corresponding temperatures are listed below:
Temperature [°C] / Vapour pressure [hPa]
60.0 5.0 x 10-6
66.5 1.8 x 10-5
72.7 4.9 x 10-5
77.8 9.8 x 10-5
82.2 1.8 x 10-4
*86.4 2.6 x 10-4
*90.4 3.1 x 10-4
*94.3 3.2 x 10-4
*98.5 3.2 x 10-4
*102.9 3.2 x 10-4
*108.7 4.6 x 10-4
*113.4 4.1 x 10-4
*119.2 2.7 x 10-4
*134.0 4.4 x 10-4
*Due to the unusual behaviour of the vapour pressure curve above 82 °C, the regression to determine the coefficient of the Antoine equation A, B, C was only done in the temperature range 60 - 82 °C. This is used to calculate the vapour pressure at lower temperatures.
The values for 20, 25 and 50 °C are calculated from the measurement curve, using the Antoine constants A, B and C.
T/°C p/hPa log(p/hPa) =A+B/(C+T[°C])
20 2.24E-09 A=19.55854
25 6.67E-09 B=-8268.98
50 9.33E-07 C=273.15
Final Results
Vapour Pressure
The calculated vapour pressure values are extrapolated:
T/°C p/hPa p/Pa
20 2.2x10-9 2.2x10-7
25 6.7x10-9 6.7x10-7
50 9.3x10-7 9.3x10-5
Applicant's summary and conclusion
- Conclusions:
- The vapour pressure of the test substance is 6.7E-09 hPa at 25 °C.
- Executive summary:
The vapour pressure of the test substance was determined in a guideline study (EU A.4; OECD TG 104) with a vapour pressure balance (effusion method). The vapour pressure is 6.7E-09 hPa at 25 °C.
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