Reaction mass of Fatty acids, montan-wax and Glycerides, montan-wax and Glycerides, tallow mono-, di- and tri-, hydrogenated and Montan wax

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

03 May - 09 June 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 guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Test guideline 2

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

Test material information

Constituent 1

Reference substance name:

Montan waxes, type WM 31

IUPAC Name:

Montan waxes, type WM 31

Details on test material:

Test item: Licolub WM 31 FL

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 16 °C to 136 °C. Above 50 °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
50.2	5.1 x 10^-6
53.3	7.7 x 10^-6
57.2	7.0 x 10^-5
58.3	8.0 x 10^-5
62.5	1.9 x 10^-4
66.4	2.1 x 10^-4
70.9	1.1 x 10^-4
75.8	5.3 x 10^-5
80.9	8.0 x 10^-5
86.4	1.4 x 10^-4
91.0	2.2 x 10^-4
95.2	3.0 x 10^-4
99.7	4.4 x 10^-4
104.6	8.0 x 10^-4
111.2	2.1 x10^-3
116.9	3.3 x 10^-3
122.8	4.2 x 10^-3
129.4	6.1 x 10^-3
135.8	8.4 x  10^-3

Until 70.9 °C, the test item is assumed to be mainly solid; at 75.8 °C and above, the test item is assumed to be liquid.

In the lower temperature range (50-71 °C) the vapour pressure data showed an unusual behaviour. In this temperature range it is supposed that the test item exists in its solid form, whereas low­molecular components of the test item are already liquid. For the vapour pressure the regression to determine the coefficient of the Antoine equation A, B, C was done for the data in the temperature range of 76-136 °C where, due to the DSC measurement, it is supposed that the test item exists in its liquid form.

The values for 20, 25 and 50 °C are calculated from the measurement curve, using the Antoine constants A, B and C shown below..

^{T/°C       p/hPa           log(p/hPa)=A+B/(C+T[°C])}

20	4.33E-08	A = 11.72823
25	9.05E-08	B = -5596.75
50	2.56E-06	C = 273.15

Final Results

As final result the calculated extrapolated values of the vapour pressure in the higher temperature range (76-136 °C, liquid form of the test item) is given:

T /°C	p/hPa	p / Pa
20	4.3 x 10^-8	4.3 x 10^-6
25	9.1 x 10^-8	9.1 x 10^-6
50	2.6 x 10^-6	2.6 x 10^-4

Applicant's summary and conclusion

Conclusions:

The vapour pressure of the test substance is 0.0000091 Pa 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 0.0000091 Pa at 25 °C.