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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:
7 October 2011 to 01 November 2011
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study conducted in accordance with EU and OECD guidelines.
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:
other: OECD 113 (1981) Screening test for thermal stability and stability in air
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: vapour pressure balance
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0 Pa
Key result
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
0.001 Pa

Thermal Stability

The DSC-measurement in a closed glass crucible showed an endothermic in the temperature range 270 °C to 330 °C. No further endothermic or exothermic effects were observed up to the maximum test temperature of 500 °C.

Vapour Pressure Balance (Effusion Method)

The vapour pressure was measured in the temperature range of 19 °C to 135 °C. Above 71 °C a vapour pressure could be measured. The measured vapour pressures at the corresponding temperatures are listed in the following table:

Temperature / °C

Vapour pressure / hPa

71.3

7.5 x 10-6

75.9

1.5 x 10-5

81.5

1.9 x 10-5

87.0

2.3 x 10-5

92.8

3.5 x 10-5

98.7

3.9 x 10-5

105.2

5.5 x 10-5

111.8

5.9 x 10-5

118.8

8.0 x 10-5

125.6

8.5 x 10-5

129.8

9.7 x 10-5

134.7

1.1 x 10-4

The course of the vapour pressure shows an atypical behaviour (low gradient). Therefore the values given as results in this report could be too high / too conservative. Due to the conservative evaluation these results will be reported as final results.

Conclusions:
The following vapour pressure values for the test item were extrapolated from the experimental data:
T / °C p/hPa p/Pa
20 1.2 x 10-6 1.2 x 10-4
25 1.5 x 10-6 1.5 x 10-4
50 5.3 x 10-6 5.3 x 10-4
Executive summary:

The purpose of this study was the determination of the vapour pressure of the test item according to the European Commission Regulation (EC) No. 440/2008, Part A: Methods for the determination of physico-chemical properties .A.4. Vapour pressure: Vapour pressure balance and OECD test guidelines, OECD 104 (2006) Vapour pressure and OECD 113 (1981) Screening test for thermal stability and stability in air.

The following vapour pressure values for the test item were extrapolated from the experimental data:

T / °C

p/hPa

p/Pa

20

1.2 x 10 -6

1.2 x 10 -4

25

1.5 x 10 -6

1.5 x 10 -4

50

5.3 x 10-6

5.3 x 10-4

Description of key information

The following vapour pressure values for the test item were extrapolated from the experimental data:
T / °C p/hPa p/Pa
20 1.2 x 10-6 1.2 x 10-4
25 1.5 x 10-6 1.5 x 10-4
50 5.3 x 10-6 5.3 x 10-4

Key value for chemical safety assessment

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

Additional information

The purpose of this study was the determination of the vapour pressure of the test item according to the European Commission Regulation (EC) No. 440/2008, Part A: Methods for the determination of physico-chemical properties .A.4. Vapour pressure: Vapour pressure balance and OECD test guidelines, OECD 104 (2006) Vapour pressure and OECD 113 (1981) Screening test for thermal stability and stability in air.