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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:
01 June, 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
under GLP
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:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: by loss of weight or by trapping vaporisate
Key result
Temp.:
20 °C
Vapour pressure:
< 0.002 Pa
Remarks on result:
other: (i.e., equivalent to <1.1 x 10(-5) mm Hg)
Key result
Temp.:
25 °C
Vapour pressure:
< 0.006 Pa
Remarks on result:
other: (i.e., equivalent to <4.3 x 10(-5) mm Hg)
Key result
Transition / decomposition:
yes
Remarks:
In a preliminary test, reaction and/or decomposition was observed starting at approximately 175°C. To prevent reaction and/or decomposition, it was decided not to test at temperatures above 140°C.
Transition temp.:
>= 175 °C

For figures, kindly refer to the attached background material section of the IUCLID.

Conclusions:
Under the study conditions, the vapour pressure of the test substance was determined to be <0.0015 Pa (i.e., equivalent to <1.1 x 10E-5 mm Hg) at 20°C and <0.0058 Pa (i.e., equivalent to <4.3 x 10E-5 mm Hg) at 25°C.
Executive summary:

A study was conducted to determine the vapour pressure of the test substance, C16 TMAC (Purity: 95.6%) using the isothermal thermogravimetric effusion method according to OECD Guideline 104, EU Method A.4 and US EPA OPPTS 830.7950. An amount of 5.58 or 11.5 mg of the test substance was applied to the surface of a roughened glass plate as a homogeneous layer using a suspension of the test substance in n-hexane. The plate was dried at 30°C under nitrogen in the thermogravimetric analyzer (TGA). The weight loss of the test substance was measured continuously as a function of time. In a preliminary test, reaction and/or decomposition was observed starting at approximately 175°C. To prevent reaction and/or decomposition, it was decided not to test at temperatures above 140°C. The weight loss of the test substance at 110°C, 120°C, 130°C and 140°C was too low for accurate determination of the vapour pressure but it was lower than the weight loss of reference substance hexachlorobenzene at the same temperatures. Under the study conditions, the vapour pressure of the test substance was determined to be <0.0015 Pa (i.e., equivalent to <1.1 x 10E-5 mm Hg) at 20°C and <0.0058 Pa (i.e., equivalent to <4.3 x 10E-5 mm Hg) at 25°C (Brekelmans, 2012).

Description of key information

The vapour pressure of the test substance was determined using the isothermal thermogravimetric effusion method according to OECD Guideline 104, EU Method A.4 and US EPA OPPTS 830.7950 (Brekelmans, 2012).

Key value for chemical safety assessment

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

Additional information

Vapour pressure was <0.0015 Pa at 20°C.