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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:
08 February 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Principles of method if other than guideline:
The measuring principle is equivalent to ASTM D2879-86 (isoteniscope principle) but with only 1 ml sample volume.
GLP compliance:
yes (incl. certificate)
Type of method:
isoteniscope
Specific details on test material used for the study:
4,4'-oxydianiline
4,4'-diaminodiphenyl ether
CAS 101-80-4
Key result
Temp.:
20 °C
Vapour pressure:
0.09 kPa
Key result
Temp.:
25 °C
Vapour pressure:
0.13 kPa
Transition / decomposition:
no

Table 1. Vapour pressure of water at various temperatures

 

Temperature °C

Literature Data kPa

Measured Data kPa

Deviation %

20

2.34

2.25

4

25

3.17

3.16

0

30

4.24

4.30

1

35

5.62

5.68

1

40

7.38

7.46

1

45

9.58

9.73

2

50

12.33

12.56

2

55

15.74

16.06

2

60

19.92

20.62

4

65

25.00

26.23

5

70

31.16

33.23

7

75

38.54

41.79

8

80

47.34

52.26

10

 

 

Table 2. Vapour pressure of 4,4-Diaminodiphenylether at various temperatures

 

Temperature °C

Vapour pressure 1 kPa

Vapour pressure 2 kPa

Mean kPa

20

-0.09

-0.09

-0.09

25

-0.01

-0.01

-0.01

30

0.07

0.07

0.07

35

0.18

0.18

0.18

40

0.33

0.33

0.33

45

0.49

0.50

0.50

50

0.70

0.72

0.71

55

0.89

0.92

0.91

60

1.26

1.31

1.29

65

1.76

1.81

1.79

70

2.34

2.41

2.38

75

3.13

3.22

3.18

80

4.01

4.11

4.06

85

5.07

5.20

5.14

90

6.35

6.52

6.44

95

7.92

8.16

8.04

100

9.55

9.84

9.70

Conclusions:
The substance is of extremely low volatility at room temperature.
Executive summary:

The substance is of extremely low volatility at room temperature.

Description of key information

The vapour pressure of the substance 4,4'-Oxydianiline was determined according to the OECD Guideline 104, under GLP conditions.

Based on the simplified Clausius-Clapeyron equation a regression line was fitted on the measured data and the vapour pressure was extrapolated for 20 and 25 °C:

20 °C 0.09 kPa

25 °C 0.13 kPa

On the basis of these results, the volatility of the test item is considered extremely low at room temperature

Key value for chemical safety assessment

Vapour pressure:
0.09 kPa
at the temperature of:
20 °C

Additional information