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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:
2022-05-16 to 2022-05-25
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2008
Deviations:
no
GLP compliance:
no
Type of method:
static method
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
12 Pa
Key result
Test no.:
#1
Temp.:
25 °C
Vapour pressure:
19 Pa
Key result
Test no.:
#1
Temp.:
50 °C
Vapour pressure:
137 Pa

Results:


Thermal Stability (DSC)


The experiment was started at 30 °C, and an endothermic effect was observed up to 70 °C. Then, an exothermic effect with an energy release of -10 J/g was observed in the temperature range of 120 – 150 °C. The test was finished at 300 °C.


The results of the DSC measurement are summarized in Table.   
















Sample weight /


atmosphere



Start / °C



Energy / J/g



8.05 mg / air



30


120



+30 (endothermic)


-10 (exothermic)



Effusion method: Knudsen cell:


The vapour pressure was measured in the temperature range of 35 to 60 °C and the values are given in the table.









































No.



Temperature/°C



Vapour pressure / Pa



1



34.6



40



2



39.6



60



3



44.5



100



4



49.6



140



5



54.7



200



6



59.7



250



The logarithm of the vapour pressure log10p as a function of the inverse temperature 1/T is given as Figure in the attachment.


The constants A and B of the Antoine equation can be obtained by regression of the data points from the measured data points of the vapor pressure curve. The calculated values are given below,


A= 12.4177


B= -3322.04


The vapour pressure of the test item was calculated by interpolation and extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation (EC) No 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline 104 (2006) is shown in table.


Calculated vapour pressure values for 20, 25 and 50 °C






















Temperature/˚C



Vapour pressure/Pa



20



12



25



19



50



137


Conclusions:
The vapour pressure of the test item was determined according to the Regulation (EC) No 440/2008 Method A.4.Vapour Pressure and OECD Test Guideline 104 (2006). The vapour pressure of the test item was determined to be 12, 19 and 137 Pa at 20, 25 and 50 °C, respectively.
Executive summary:

The vapour pressure of the test item was determined according to the Regulation (EC) No 440/2008 Method A.4.Vapour Pressure and OECD Test Guideline 104 (2006). The vapour pressure of the test item was determined to be 12, 19 and 137 Pa at 20, 25 and 50 °C, respectively.


Based on DSC measurement, an endothermic effect was observed in the temperature range from 30 °C to 70 °C. Then, an exothermic effect was found with an energy release of -10 J/g in the temperature range of 120 -150 °C.

Description of key information

The vapour pressure of the test item was determined according to the Regulation (EC) No 440/2008 Method A.4.Vapour Pressure and OECD Test Guideline 104 (2006). The vapour pressure of the test item was determined to be 12, 19 and 137 Pa at 20, 25 and 50 °C, respectively.

Key value for chemical safety assessment

Vapour pressure:
19 Pa
at the temperature of:
25 °C

Additional information

The vapour pressure of the test item was determined according to Regulation (EC) No 440/2008 Method A.4.Vapour Pressure and OECD Test Guideline 104 (2006). The vapour pressure of the test item was determined to be 12, 19 and 137 Pa at 20, 25 and 50 °C, respectively.


Based on DSC measurement, an endothermic effect was observed in the temperature range from 30 °C to 70 °C. Then, an exothermic effect was found with an energy release of -10 J/g in the temperature range of 120 -150 °C.