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Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
19 Jun 2019 - 02 Aug 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2020
Report date:
2020

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2016
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry

Test material

Constituent 1
Chemical structure
Reference substance name:
Salts of phosphoric acid, 2-ethylhexyl esters with C16-18 (even numbered) and C18-unsaturated-alkylamines
EC Number:
949-859-1
Molecular formula:
not applicable
IUPAC Name:
Salts of phosphoric acid, 2-ethylhexyl esters with C16-18 (even numbered) and C18-unsaturated-alkylamines
Test material form:
liquid
Details on test material:
- Appearance: Clear yellow liquid
- Storage condition: At room temperature
Specific details on test material used for the study:
Decomposition: 200°C

Results and discussion

Vapour pressureopen allclose all
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa

Any other information on results incl. tables

Table: Results of the vapour pressure isothermal TGA analysis (substance)

Temperature
[°C]

Weight loss
[µg/min]

νT
[g/cm2/h]

log νT

log PT

PT
[Pa]

150

1.69063

2.02 x 10-4

-3.70

0.38

2.4

 

1.61590

1.93 x 10-4

-3.71

0.36

2.3

160

3.05539

3.65 x 10-4

-3.44

0.71

5.1

 

3.02549

3.61 x 10-4

-3.44

0.70

5.0

170

6.23354

7.44 x 10-4

-3.13

1.10

13

 

5.80625

6.93 x 10-4

-3.16

1.06

11

180

11.2987

1.35 x 10-3

-2.87

1.43

27

 

10.2183

1.22 x 10-3

-2.91

1.37

23

 

Applicant's summary and conclusion

Conclusions:
The vapour pressure of the substance at 20°C and 25°C was determined to be 2.5E-7 Pa and 6.1E-7 Pa, respectively.
Executive summary:

The vapour pressure of the substance was determined using the isothermal thermogravimetric effusion method in a GLP study based on EC A.4, OECD 104 and OPPTS 830.7950. Validation of the method was performed using a set of five reference substances.

The vapour pressure regression curve (log PT as function of 1/T; with T in K) of the substance was constructed from weight losses measured at 150°C, 160°C, 170°C and 180°C.

The vapour pressure of the substance at 20°C and 25°C was calculated from the vapour pressure curve to be 2.5E-7 Pa and 6.1E-7 Pa, resp.