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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:
December 2011
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Well conducted study, according to ASTM E1782-08 , under Internal management system, certificate of analysis included in the report.
Qualifier:
according to
Guideline:
other: ASTM E1782-08, Standard test method for determining vapour pressure by Thermal Analysis, March 1, 2008
Deviations:
no
Principles of method if other than guideline:
ASTM E1782-08 is not included into EC Regulation No 761/2009, Guideline A.4, but it is expected that this will occur in the near future. In 2010 a request for inclusion was sent to the Dutch National Coordinator for EC Test Methods.
GLP compliance:
no
Type of method:
other: Thermal analysis
Temp.:
20 °C
Vapour pressure:
6.28 Pa

Calibration

The pressure transducer was calibrated at June 4, 2010 over a pressure range of

0.02 to 13 kPa. The measured deviation was maximum 0.0013 kPa.

 

The temperature deviation as function of pressure was determined over a pressure range of 0.02 – 100 kPa with 12.74 mg Indium in a70 µl Aluminium cup with pierced lid. The heating rate was 5°C/min. The measured boiling temperatures of the test substance at the different pressures were corrected for this deviation.

 

Test substance

Six measurements at different pressures were carried out with the test substance. Because the test substance is a mixture of different components, more than one boiling peak is observed. The initial boiling peak is used for the evaluation.

The intakes, the measured (initial)boiling temperatures and their corresponding observed pressures are listed in the table below.

Measurement

Intake

[mg]

Observed pressure

[kPa]

Boiling temperature

[°C]

1

15.33

0.453

47.9

2

14.62

1.054

58.8

3

14.68

2.00

69.7

4

14.90

3.33

76.4

5

14.72

6.67

85.1

6

15.22

12.0

97.1

           

The vapour pressure plot of the individual measurements is shown in figure 1 in the attachment together with the Antoine fit (regression line) of the measured data.

The Antoine equation constants A, B and C are calculated from this fit. This results in the following equation:

10log p(kPa) =3.8797 – [408.68 /(T(K)-225.95)]      

           

The estimated vapour pressure of the test substance calculated from this equation is 6.28∙10-3kPa at 20°C.

 


 

Conclusions:
The estimated vapour pressure of 2,4-Pentanedione, peroxide is 6.28 Pa at 20°C.
Executive summary:

The vapour pressure of 2,4-Pentanedione, peroxide, 30% in solvent mixturewas determined according to ASTM E1782-08 . This method is not included intoEC Regulation No 761/2009, Guideline A.4 , but it is expected that this will occur in the near future. In 2010 a request for inclusion was sent to the Dutch National Coordinator for EC Test Methods.

The estimated vapour pressure of 2,4-Pentanedione, peroxide is 6.28 Pa at 20°C.

Description of key information

The estimated vapour pressure of 2,4-Pentanedione, peroxide is 6.28 Pa at 20°C.

Key value for chemical safety assessment

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

Additional information