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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:
13 -15 January 2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study was conducted according to an internationally recognised method, and under GLP. No deviation was reported. The substance is adequately characterised. Therefore full validation applies.
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
Regulation (EC) No 440/2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
1996
Principles of method if other than guideline:
Not applicable
GLP compliance:
yes (incl. QA statement)
Remarks:
inspected on January 22 and 23, 2013 / signed on March 22, 2013
Type of method:
effusion method: vapour pressure balance
Specific details on test material used for the study:
STORAGE CONDITIONS OF TEST MATERIAL
Keep in the dark 0-10 °C under nitrogen
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.33 Pa
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0.59 Pa
Key result
Transition / decomposition:
yes
Transition temp.:
>= 250 °C

Thermal Stability:

In the temperature range of 120 - 130 °C a very small exothermic effect can be observed. At a temperature of 250 °C the test item starts to decompose. The test was terminated at a temperature of 300 °C.

 

Effusion method: Vapour pressure balance

The vapour pressure was measured in the temperature range of 20 to 39 °C.

 

Table 4.6/1: Results of the Effusion method

 

No.

Temperature (°C)

Vapour pressure (Pa)

1

20

0.34

2

21

0.35

3

24

0.51

4

29

0.96

5

33

1.49

6

35

1.87

7

39

2.65

 

The constants of the Antoine equation were derived from the measured data points of the vapour pressure curve:

log10 VP = 14.7698 - 4471.81 / (273.15+T)

The vapour pressure of the test item derived from this regression for the temperatures of 20, 25 and 50 °C were 0.33, 0.59 and 8.54, respectively.

Conclusions:
Low volatility (based on volatility bands criteria for occupational exposure (Chesar / ECETOC TRA), << 500 Pa).
Executive summary:

The vapour pressure of the test substance was measured under GLP according to OECD 104 / EU A4 guideline by effusion (vapour pressure balance) method.

A preliminary thermal stability test by DSC showed decomposition starting from ca 250°C.

A series of seven measurements was recorded between 20 and 39°C, corresponding to 0.34 to 2.65 Pa.

The vapour pressure of the test item was interpolated from the regression to be 0.33 Pa at 20°C, and 0.59 Pa at 25°C.

Description of key information

Low volatility.

Key value for chemical safety assessment

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

Additional information

A fully reliable experimental study, conducted according to a recognized OECD/EC method and under GLP, is available. It is considered as a key study. The result is retained as key data.