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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:
2014
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: In accordance with test guidelines EC A.4 and OECD 104 but with a deviation.
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
(2006)
Deviations:
yes
Remarks:
An Aluminium pan has been used instead of a roughened glassplate.
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
yes
Remarks:
see above
GLP compliance:
no
Type of method:
other: Effusion method: isothermal thermogravimetry
Temp.:
25 °C
Vapour pressure:
0.018 Pa

Table: Experimental evaporation rates of test substance with calculated vapour pressure.

Temp. (°C)

Evaporation Rate (µg/min)

log Evaporation Rate (µg/min)

Temp. (1/K)

Log Vapour Pressure (mmHg)

Calculated Vapour Pressure (mm Hg)

Calculated Vapour Pressure (Pascal)

50

0.02374

-1.6245

0.00309

-3.3295

0.00046826

0.062429

60

0.03488

-1.4574

0.00300

-3.1573

0.00069621

0.092821

65

0.04315

-1.3650

0.00296

-3.0620

0.00086697

0.11559

70

0.05094

-1.2929

0.00291

-2.9877

0.0010287

0.13715

80

0.08012

-1.0963

0.00283

-2.7849

0.0016408

0.21876

The isotherms at 65°C is shown in the picture below along with the heat profile and slope at constant rate of weight loss (over 300 minutes). 

Conclusions:
Using the isothermal thermogravimetric effusion method, the vapour pressure of the substance at 25°C has been determined as 0.018 Pa.

Description of key information

Vapour pressure at 25°C: 0.018 Pa (EC A.4 and OECD 104: isothermal thermogravimetric effusion method)

Key value for chemical safety assessment

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

Additional information

Deviation from the test guidelines: an Aluminium pan has been used instead of a roughened glassplate.