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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:
29 April 2015 to 2 September 2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study performed according to EU, OECD and EPA test guidelines to a GLP recognised standard
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes
Type of method:
other: isothermal thermogravimetric effusion method.
Temp.:
20 °C
Vapour pressure:
< 0 Pa
Temp.:
25 °C
Vapour pressure:
< 0 Pa

 Results of the isothermal TGA analysis

Temperature (°C)

Weight loss (μg/min)

νT

(g/cm2/h)

log νT

log PT

PT

(Pa)

210

0.8091

9.66 x 10-5

-4.02

-0.05

0.89

0.8039

9.60 x 10-5

-4.02

-0.05

0.88

220

1.219

1.46 x 10-4

-3.84

0.16

1.4

1.218

1.45 x 10-4

-3.84

0.16

1.4

230

1.976

2.36 x 10-4

-3.63

0.40

2.5

2.246

2.68 x 10-4

-3.57

0.47

2.9

240

3.650

4.36 x 10-4

-3.36

0.72

5.2

4.289

5.12 x 10-4

-3.29

0.80

6.3

 

Calculated vapour pressure of the test substance

Temperature (°C)

log PT

PT

(Pa)

PT

(mm Hg)

20

-9.07

8.4 x 10-10

6.3 x 10-12

25

-8.69

2.0 x 10-9

1.5 x 10-11

 

Vapour pressure of the test substance

 

20°C

25°C

 

(Pa)

(mm Hg)

(Pa)

(mm Hg)

Test substance

< 1.3´10-8

< 1.0´10-10

< 2.9´10-8

< 2.2´10-10

 

Conclusions:
In conclusion the vapour pressure of the test substance was:
< 1.3 x 10^-8 Pa (at 20°C)
< 1.0 x 10^-10 mm Hg (at 20°C)
< 2.9 x 10^-8 Pa (at 25°C)
< 2.2 x 10^-8 mm Hg (at 25°C)
Executive summary:

The isothermal TGA effusion method was applied for the determination of the vapour pressure of (1,2-Dioxoethylen)bis(iminoethylen)bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionat].

The weight losses of the test substance were obtained at temperatures above the melting temperature of the test substance because no significant weight loss of the test substance was observed below the melting temperature. According to this, the vapour pressure at 20°C and 25°C might be overestimated. The calculated vapour pressure of the test substance was determined to be lower than that of benzo(ghi)perylene.

In conclusion the vapour pressure of the test substance at 20°C (293K) and 25°C (298K) was:

 

20°C

25°C

 

(Pa)

(mm Hg)

(Pa)

(mm Hg)

Test substance

< 1.3x10-8

< 1.0x10-10

< 2.9x10-8

< 2.2x10-10

 

The substance is not considered to demonstrate any propensity towards vapourisation.

Description of key information

Vapoure pressure of the test substance using the isotermal TGA effusion method was:

< 1.3 x 10-8 Pa (at 20°C)

< 1.0 x 10-10 mm Hg (at 20°C)

< 2.9 x 10-8 Pa (at 25°C)

< 2.2 x 10-8 (at 25°C)

Key value for chemical safety assessment

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

Additional information

The isothermal TGA effusion method was applied for the determination of the vapour pressure of (1,2-Dioxoethylen)bis(iminoethylen)bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionat].

The weight losses of the test substance were obtained at temperatures above the melting temperature of the test substance because no significant weight loss of the test substance was observed below the melting temperature. According to this, the vapour pressure at 20°C and 25°C might be overestimated. The calculated vapour pressure of the test substance was determined to be lower than that of benzo(ghi)perylene.

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

 

20°C

25°C

 

(Pa)

(mm Hg)

(Pa)

(mm Hg)

Test substance

< 1.3´10-8

< 1.0´10-10

< 2.9´10-8

< 2.2´10-10