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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:
04-02-2021 to 26-03-2021
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Guideline study performed under GLP. All relevant validity criteria were met.
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
equivalent or similar to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Test no.:
#1
Temp.:
25 °C
Vapour pressure:
0 Pa

The results of the isothermal TGA analysis for the test item and the vapour pressure at 20°C and 25°C are given in the following tables.

 

Table 2 Results of the isothermal TGA analysis

Temperature

[°C]

Weight loss

[µg/min]

νT

[g/cm2/h]

log νT

log PT

PT

[Pa]

100

1.03019

1.24 × 10^-4

-3.91

0.16

1.4

 

0.892157

1.06 × 10^-4

-3.97

0.09

1.2

110

2.32147

2.77 × 10^-4

-3.56

0.57

3.8

 

1.80160

2.15 × 10^-4

-3.67

0.45

2.8

120

5.27852

6.30 × 10^-4

-3.20

0.99

9.8

 

3.99260

4.77 × 10^-4

-3.32

0.85

7.1

130

10.2604

1.22 × 10^-3

-2.91

1.33

21

 

8.10329

9.67 × 10^-4

-3.01

1.21

1.6

 

Table 2 Vapour pressure of the test item

Temperature

[°C]

log PT

PT

[Pa]

PT

[mm Hg]

20 

-4.12

7.5 x10^-5

5.6 x10^-7

25

-3.79

1.6 x10^-4

1.2 x10^-6

 

The plot of the log PT of the test item as function of the reciprocal temperatures was performed. The equation of the curve was: log PT,20 = -5802 × 1/T + 15.67 (r = 0.990, n = 8).

Conclusions:
The vapour pressure of the test item was determined to be 0.000075 Pa at 20°C and 0.00016 at 25°C, respectively.
Executive summary:

The vapour pressure was determined according to EU Method A.4 and OECD TG 104 using the thermogravimetric effusion method under GLP. The vapour pressure of the test item was determined to be 0.000075 Pa (or 5.6 x10^-7 mm Hg) at 20°C and 0.00016 Pa (or 1.2 x10^-6 mm Hg) at 25°C, respectively.

 

Applicant assessment indicates that the test item vapour pressure was conducted below the point where decomposition can occur ≥ 135°C in air and/or ≥ 150°C under inert gas (nitrogen). Additionally, was conducted below the expected boiling point is > 150°C at 1 atm.

Description of key information

Vapour Pressure: 0.000075 Pa at 20°C and 0.00016 Pa at 25°C, OECD TG 104 - thermogravimetric effusion method, 2021

Key value for chemical safety assessment

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

Additional information

Key study : EU Method A.4, 2021 : The vapour pressure was determined according to EU Method A.4 and OECD TG 104 using the thermogravimetric effusion method under GLP. The vapour pressure of the test item was determined to be 0.000075 Pa (or 5.6 x10^-7 mm Hg) at 20°C and 0.00016 Pa (or 1.2 x10^-6 mm Hg) at 25°C, respectively.