Reaction mass of montan wax and fatty acids, montan-wax, mixed esters with adipic acid and trimethylolpropane and fatty acids, montan-wax and fatty acids, montan-wax, esters with trimethylolpropane

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

3-10 May 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 WE 40

IUPAC Name:

Montan waxes, type WE 40

Details on test material:

Test item: Licolub WE 40 P

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 122 °C. Above 45 °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
58.1	1.1 x 10^-5
62.1	1.7 x 10^-5
64.7	2.6 x 10^-5
66.7	3.3 x 10^-5
68.3	3.5 x 10^-5
71.0	4.0 x 10^-5
74.8	5.1 x 10^-5
79.2	2.5 x 10^-5
83.8	2.7 x 10^-5
88.9	6.1 x 10^-5
93.9	9.6 x 10^-5
98.9	1.3 x 10^-4
104.3	2.0 x 10^-4
109.8	2.6 x 10^-4
114.6	3.7 x 10^-4
121.5	7.1 x 10^-4

The vapour pressure data showed an unusual behaviour with a two-staged curve shape. For the vapour pressure the regression to determine the coefficient of the Antoine equation A, B, C was done for the two stages of the curve separately. First for the curve shape in the temperature range 58-75 °C where it is supposed that the test item exists in its solid form, and second for the curve shape the temperature range 79-122 °C where 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	1.84E-07	A = 9.13809
25	3.40E-07	B = -4652.95
50	5.49E-06	C = 273.15

Final Results

As final result the calculated extrapolated values of the vapour pressure in the lower temperature range (58-75 °C, solid form of the test item) is given:

T /°C	p/hPa	p / Pa
20	1.8 x 10^-7	1.8 x 10^-5
25	3.4 x 10^-7	3.4 x 10^-5
50	5.5 x 10^-6	5.5 x 10^-4

Applicant's summary and conclusion

Conclusions:

The vapour pressure of the test substance is 0.000034 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 0.000034 Pa at 25 °C.