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Diss Factsheets

Physical & Chemical properties

Vapour pressure

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 06 June, 2012 to 11 June, 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
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 Pa
Remarks on result:
other: (i.e., equivalent to <6.3 x 10E-9 mm Hg)
Key result
Temp.:
25 °C
Vapour pressure:
< 0 Pa
Remarks on result:
other: (i.e., equivalent to <2.2 x 10E-8 mm Hg)
Key result
Transition / decomposition:
ambiguous
Remarks:
At 170°C, 180°C, 190°C and 200°C, a higher weight loss was observed with higher amount of test substance used in the test. This indicated reaction and/or decomposition of the test substance at these temperatures.
Transition temp.:
>= 170 °C

At 170°C, 180°C, 190°C and 200°C, a higher weight loss was observed with higher amount of test substance used in the test. This indicated reaction and/or decomposition of the test substance at these temperatures.

At 170°C, 180°C, 190°C and 200°C however, the weight loss of the test substance was lower than the weight loss of reference substance chrysene. According to this, the vapour pressure of the test substance was determined to be lower than that of chrysene.

Conclusions:
Under the study conditions, the vapour pressure of the test substance was determined to be <0.00000084 Pa (i.e., equivalent to <6.3 x 10E-9 mm Hg) at 20°C and <0.0000029 Pa (i.e., equivalent to <2.2 x 10E-8 mm Hg) at 25°C.
Executive summary:

A study was conducted to determine the vapour pressure of the test substance, C16-18 TMAC (72.78% active) using isothermal thermogravimetric effusion method according to the OECD Guidleine 104. An amount of 3.47 or 11.00 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 weight loss of the test substance was measured continuously as a function of time. At 170°C, 180°C, 190°C and 200°C, a higher weight loss was observed with higher amount of test substance used in the test. This indicated reaction and/or decomposition of the test substance at these temperatures. At 170°C, 180°C, 190°C and 200°C however, the weight loss of the test substance was lower than the weight loss of reference substance chrysene. Accordingly, the vapour pressure of the test substance was determined to be lower than that of chrysene.

Under the study conditions, the vapour pressure of the test substance was determined to be <0.00000084 Pa (i.e., equivalent to <6.3 x 10E-9 mm Hg) at 20°C and <0.0000029 Pa (i.e., equivalent to <2.2 x 10E-8 mm Hg) at 25°C (Brekelmans, 2012).

Description of key information

The vapour pressure of the test substance was determined using isothermal thermogravimetric effusion method according to the OECD Guidleine 104 (Brekelmans, 2012).

Key value for chemical safety assessment

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

Additional information

<8.4E-7 Pa at 20°C