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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
28 Jul 2014 - 1 Aug 2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to guideline
Guideline:
other: OECD Guideline 113
Version / remarks:
before the test to detemine the vapour pressure a DSC-measurement was performed to determine the thermal stability of the test item
GLP compliance:
yes (incl. QA statement)
Remarks:
Hess. Ministerium für Umwelt, Energie, Landwirtschaft und Verbraucherschutz, Wiesbaden, Germany
Type of method:
effusion method: vapour pressure balance
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Key result
Vapour pressure:
0 Pa
Transition / decomposition:
yes
Remarks:
endothermic effect (melting)
Transition temp.:
>= 105 - <= 130 °C
Transition / decomposition:
yes
Remarks:
exothermic effect (decompositon) with a decomposition energy of -150 J/g
Transition temp.:
>= 140 - <= 230 °C

The vapour pressure was measured in the temperature range of 92 to 113 °C. The measured vapour pressure values together with the measured temperatures are listed in following table:

 No.  Temperature [°C]  Vapour pressure [Pa]
 1 97 1.12 x 10-3
 2 99 2.92 x 10-3
 3 102 6.50 x 10-3
 4 104 9.45 x 10-3
 5 105 1.37 x 10-2
 6 107 1.94 x 10-2
 7 109 2.14 x 10-2
 8 112 2.54 x 10-2
 9 92 1.24 x 10-3
 10 97 2.87 x 10-3
 11 102 5.10 x 10-3
 12 108 1.12 x 10-2
 13 108 1.14 x 10-2
 14 113 2.32 x 10-2

During the test the test item melted and changed its appearance at room temperature from alight beige powder into a reddish solid.

From the measured data points of the vapour pressure curve the constants A and B of the Antoine equation can be derived by regression of the data points:

log10 p = A + B/T = B/(C + ϑ)

p = vapour pressure Pa

T = temperature in K

A, B = Antoine constants

C = Antoine constant = 273.15

ϑ = temperature in °C

A = 24.2727

B = -10028.74

Vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C.

Description of key information

extrapolated vapour pressure of pure substance:


1.8E-10 Pa at 20 °C


6.9E-10 Pa at 25 °C


2.7E-7 Pa at 50 °C


(OECD Guideline 104, effusion method: vapour pressure balance)


 


Before the test to detemine the vapour pressure a DSC-measurement was performed to determine the thermal stability of the test item:


The test item, pure substance, showed an endothermic effect (105 – 130 °C) followed by an exothermic effect (140 - 230 °C) with a decomposition energy of -150 J/g.


(OECD Guideline 113, DSC)

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
20 °C

Additional information