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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 13 January 2022 to 17 January 2022
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
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: isothermal thermogravimetry
Specific details on test material used for the study:
Chlorinated 45% w/w
Key result
Test no.:
#2
Temp.:
ca. 25 °C
Vapour pressure:
ca. 0.005 Pa
Key result
Test no.:
#2
Temp.:
ca. 20 °C
Vapour pressure:
ca. 0.003 Pa
Conclusions:
Vapour pressure at 20°C was 2.753 mPa.
Vapour pressure at 25°C was 4.580 mPa.
Executive summary:

The vapour pressure of test item was determined using Effusion method isothermal thermogravimetric analysis (TGA).


The Validation of the method was performed using a set of four reference substances. The constants C and D specific for the experimental arrangement were 1.1059 and 5.1067, respectively.


The evaporation rate of each reference substance and test item (VT) were calculated at elevated temperatures from the weight loss of the compounds.


The vapour pressure of the test item was performed in duplicate using TGA method. The vapor pressure of the test item at 20°C and 25°C were estimated by extrapolation and the vapor pressure results of the test item are presented below.


 





































Temperature


(°C)



Vapour Pressure of the Test Item (ESTERI METILICI ACIDI GRASSI DA OLIO ESSEBIOCHLOR45)



[Pa]



[mPa]



R1



R2



R1



R2



20°C



2.862 × 10-3



2.643 × 10-3



2.862



2.643



25°C



4.753 × 10-3



4.407 × 10-3



4.753



4.407



 Mean Vapour pressure at 20°C = 2.753 × 10-3 Pa (2.753 mPa)


 Mean Vapour pressure at 25°C = 4.580 × 10-3 Pa (4.580 mPa)



 


From the TGA results, the repeatability of the obtained vapour pressure of the test item in duplicate was found to be < 30%.

Description of key information

Vapour pressure was 2.753 mPa and 4.580 mPa at 20°C and 25°C, respectively.

Key value for chemical safety assessment

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

Additional information