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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:
2011
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

Constituent 1
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

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.