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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:
18 June 2015 - 27 November 2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
(2009)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
(2006)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
(1996)
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry
Key result
Temp.:
25 °C
Vapour pressure:
< 7 other: E-03 Pa
Remarks on result:
other: (<5.3E-05 mm Hg)
Key result
Temp.:
20 °C
Vapour pressure:
< 1.5 other: E-03 Pa
Remarks on result:
other: (<1.1E-05 mm Hg)

In both the first and second analysis of the test substance, the weight losses of the test substance at 110°C, 120°C, 130°C and 140°C were lower than the weight losses of hexachlorobenzene at the same temperatures. From this it was concluded that vapour pressure of the substance at 20°C (25°C) is lower than the vapour pressure of hexachlorobenzene at 20°C (25°C).

Conclusions:
Using the isothermal thermogravimetric effusion method, the vapour pressure of MTBAC at 25°C has been determined as < 7.0E-03 Pa. The vapour pressure of MTBAC at 20°C has been determined as < 1.5E-03 Pa.
The study was performed in accordance with EC A.4, OECD 104 and EPA OPPTS 830.7950 guidelines and in compliance with GLP.

Description of key information

Using the isothermal thermogravimetric effusion method, the vapour pressure of MTBAC at 25°C has been determined as < 7.0E-03 Pa. The vapour pressure of MTBAC at 20°C has been determined as < 1.5E-03 Pa.  The study was performed in accordance with EC A.4, OECD 104 and EPA OPPTS 830.7950 guidelines and in compliance with GLP.

Key value for chemical safety assessment

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

Additional information

Key value for CSA: < 0.007 Pa at 25°C