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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2016
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
1996
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: PX708164
- Expiration date of the lot/batch: 31 March 2018


STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: At room temperature container flushed with nitrogen
Key result
Temp.:
ca. 20 °C
Vapour pressure:
ca. 0.001 Pa
Remarks on result:
other: based on the non-volatile part of the test item
Temp.:
ca. 25 °C
Vapour pressure:
ca. 0.001 Pa
Remarks on result:
other: based on the non-volatile part of the test item

Volatile part of the Test Item

Weight loss observed from the start of the study was due to evaporation of solvent. A representative weight loss curve of volatile part of the test item is shown in Figure 4. A non-linear weight loss was observed and the results within this range were therefore not reliable for the determination of the vapour pressure (detailed calculations archived in the raw data).

The weight loss of the volatile part of the test item at 30°C and 40°C was lower than the weight loss of the reference substance at the same temperatures. According to this the vapour pressure of the volatile part of the test item was determined to be lower than that of water. A representative weight loss curve of wateris shown in Figure 5.

The results of the vapour pressure for the test item at 20°Cand 25°Care given in Table 3.

     
Table 3 Vapour pressure of the volatile part of the Test Item

 

20°C

25°C

 

[Pa]

[mm Hg]

[Pa]

[mm Hg]

Test item

< 2.3´103

< 18

< 3.2´103

< 24

 

Non-volatile part of the Test Item

A representative weight loss curve of the test item is shown in Figure 6. The results of the isothermal TGA analysis for the test item and the vapour pressure at 20°C and 25°C are given in Table 4 and Table 5.

 

The vapour pressure regression curve of the log PT of the test item as function of the reciprocal temperatures is shown in Figure 7. The equation of the curve was:
log PT= -2951´1/T + 6.94 (r = 0.991, n = 6).

       
Table 4 Results of the Vapour pressure Isothermal TGA Analysis

Temperature [°C]

Weight loss [µg/min]

νT [g/cm2/h]

log νT

log PT

PT [Pa]

170

1.36139

1.63´10-4

-3.79

0.29

 1.9

 

1.34931

1.61´10-4

-3.79

0.28

1.9

180

1.68835

2.02´10-4

-3.70

0.41

 2.5

 

1.69970

2.03´10-4

-3.69

0.41

 2.6

190

2.35157

2.81´10-4

-3.55

0.59

 3.9

 

2.20078

2.63´10-4

-3.58

0.55

 3.6

Table 5          
Vapour Pressure of the non-volatile part of the Test Item

Temperature [°C]

log PT

PT [Pa]

PT [mm Hg]

20

-3.13

7.4´10-4

5.6´10-6

25

-2.96

1.1´10-3

8.2´10-6

 

Conclusions:
The vapour pressure of the non-volatile part of the test item at 20°C is 7.4E-4 Pa.
Executive summary:

The isothermal TGA effusion method was applied for the determination of the vapour pressure of Setalux 7002 BX-55.

The vapour pressure of the volatile part of the test item at 20°C (293K) and 25°C (298K) was:

 

20°C

25°C

[Pa]

[mm Hg]

[Pa]

[mm Hg]

Test item

< 2.3´103

< 18

< 3.2´103

< 24

 

The vapour pressure of the non-volatile part of the test item at 20°C (293K) and 25°C (298K) was:

 

20°C

25°C

[Pa]

[mm Hg]

[Pa]

[mm Hg]

Test item

7.4´10-4

5.6´10-6

1.1´10-3

8.2´10-6

Description of key information

The isothermal TGA effusion method was applied for the determination of the vapour pressure of Setalux 7002 BX-55.

The vapour pressure of the volatile part of the test item at 20°C (293K) is <2.3E3 Pa, the vapour pressure of the non-volatile part of the test item at 20°C (293K) is 7.4E-4 Pa.

Key value for chemical safety assessment

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

Additional information