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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:
07 September 2015 to 10 December 2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: isothermal thermogravimetry
Key result
Temp.:
20 °C
Vapour pressure:
<= 0.095 Pa
Temp.:
20 °C
Vapour pressure:
<= 0.001 mm Hg
Temp.:
25 °C
Vapour pressure:
<= 0.13 Pa
Temp.:
25 °C
Vapour pressure:
<= 0.001 Pa

The equation of the curve was: log PT= -2561 x 1/T + 7.71 (r = 0.994, n = 6).

 

Results of the isothermal TGA analysis

Temperature [°C]

Weight loss [μg/min]

vT

[g/cm2/h]

Log vT

Log PT

PT

[Pa]

110

6.520

6.884

7.78 x 10-4

8.22 x 10-4

-3.11

-3.09

1.01

1.04

10

11

120

9.933

9.326

1.19 x 10-3

1.11 x 10-3

-2.93

-2.95

1.23

1.19

17

16

130

12.66

13.03

1.51 x 10-3

1.56 x 10-3

-2.82

-2.81

1.35

1.36

22

23

 

Vapour pressure of the test item

Temperature [°C]

Log PT

PT

[Pa]

PT

[mm Hg]

20

25

-1.02

-0.87

9.5 x 10-2

1.3 x 10-1

7.1 x 10-4

1.0 x 10-3

 

Conclusions:
The vapour pressure of the test item at 20°C (293K) and 25°C (298K) was:≤ 9.5 x 10-2 Pa; ≤ 7.1 x 10-4 mm Hg @ 20°C≤ 1.3 x 10-1 Pa; ≤ 1.0 x 10-3 mm Hg @ 25°C
Executive summary:

The purpose of the study was to determine the physico-chemical properties for Formaldehyde, oligomeric reaction products with acetone and diphenylamine.

 

The study was performed to the following guidelines, in compliance with GLP:

European Community (EC), EC no. 761/2009, Part A: Methods for the Determination of Physico-Chemical Properties, Guideline A.4: “Vapour Pressure", Official Journal of the European Union no. L220, August 24, 2009.

Organization for Economic Co-operation and Development (OECD), OECD Guidelines for the Testing of Chemicals no.104: "Vapour Pressure", March 23, 2006.

United States Environmental Protection Agency (EPA), Product Properties Test Guidelines no. OPPTS 830.7950: "Vapor pressure", August 1996.

 

The isothermal TGA effusion method was applied for the determination of the vapour pressure of Formaldehyde, oligomeric reaction products with acetone and diphenylamine.

 

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

≤ 9.5 x 10-2Pa; ≤ 7.1 x 10-4mm Hg @ 20°C

≤ 1.3 x 10-1Pa; ≤ 1.0 x 10-3mm Hg @ 25°C

 

The weight losses of the test item were obtained with a temperature program of above the melting temperature of the test item. According to this, the vapour pressure of the test item (which was, according to the method, extrapolated to 20°C and 25°C) could be slightly overestimated.

Description of key information

Key value determined in a GLP accredited laboratory study using the isothermal TGA effusion method in accordance with OECD Guideline 104, EU Method A.4 & US EPA Procedure 830.7950

 

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

≤ 9.5 x 10-2Pa; ≤ 7.1 x 10-4mm Hg @ 20°C

≤ 1.3 x 10-1Pa; ≤ 1.0 x 10-3mm Hg @ 25°C

Key value for chemical safety assessment

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

Additional information