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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:
2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry
Specific details on test material used for the study:
Identification: N,N’-Di-sec-butyl-p-phenylenediamine
Appearance: Red/Brown oily liquid
Batch: W8A18GN001
Purity/Composition: See Certificate of Analysis
Test item storage: In refrigerator (2-8°C) protected from light
container flushed with nitrogen

Stable under storage conditions until: 22 January 2019 (expiry date)
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.026 Pa
Test no.:
#2
Temp.:
20 °C
Vapour pressure:
0 mm Hg
Test no.:
#3
Temp.:
25 °C
Vapour pressure:
0.05 Pa
Test no.:
#4
Temp.:
25 °C
Vapour pressure:
0 mm Hg

The equation of the curve was: log PT = -4915 x 1/T + 15.19 (r = 0.996, n = 8).

Temperature

[°C]

Weightloss

[µg/min]

νT

[g/cm2/h]

logνT

logPT

PT

[Pa]

50

 

60

 

70

 

80

0.805770

0.835539

1.53184

1.72037

3.96057

3.71584

8.79572

7.59599

7.62x10 -5

9.97x10 -5

1.83x10 -4

2.05x10 -4

4.73x10 -4

4.44x10 -4

1.05x10 -3

9.07x10 -4

-4.02

-4.00

-3.74

-3.69

-3.33

-3.35

-2.98

-3.04

0.00

0.02

0.35

0.42

0.88

0.85

1.32

1.24

0.99

1.0

2.3

2.6

7.6

7.0

21

17

Vapour Pressure of the Test Item

Temperature

[°C]

logPT

PT

[Pa]

PT

[mmHg]

20

25

-1.58

-1.30

2.6x10 -2

5.0x10 -2

2.0x10 -4

3.8x10 -4

The isothermal TGA effusion method was applied for the determination of the vapour

pressure ofN,N’-Di-sec-butyl-p-phenylenediamine.

 

The vapour pressure 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             2.6 x10-2             2.0x10-4             5.0x10-2             3.8x10-4

Executive summary:

The vapour pressure 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             2.6 x10-2             2.0x10-4             5.0x10-2             3.8x10-4

Description of key information

The vapour pressure 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             2.6 x10-2             2.0x10-4             5.0x10-2             3.8x10-4

Key value for chemical safety assessment

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

Additional information

The objective of this study was to determine the Vapour Pressure of N,N’-Di-sec-butyl-p-phenylenediamine by Isothermal Thermogravimetry. The isothermal TGA effusion method was applied for the determination of the vapour pressure of N,N’-Di-sec-butyl-p-phenylenediamine.

The vapour pressure 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             2.6 x10-2             2.0x10-4             5.0x10-2             3.8x10-4