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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From June 06, 2012 to June 13, 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reference:
Composition 1
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: by loss of weight or by trapping vaporisate
Test material information:
Composition 1
Specific details on test material used for the study:
- Name of test material (as cited in study report): Trimethyloctadecyl ammonium chloride
- Physical state: White powder
- Lot/batch No.: DEG4147039
- Storage condition of test material: At room temperature in the dark
Key result
Temp.:
20 °C
Vapour pressure:
< 0 Pa
Remarks on result:
other: i.e., equivalent to <6.3E-09 mm Hg
Key result
Temp.:
25 °C
Vapour pressure:
< 0 Pa
Remarks on result:
other: i.e., equivalent to <2.2E-08 mm Hg

- After the experiment, a beige residue remained in the sample container (original colour: white). The change of the colour indicated a reaction and/or a decomposition of the test substance. This was also confirmed by the higher weight loss with higher amount of test substance used in the test.

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

Conclusions:
Under the conditions of the study, the vapour pressure of the test substance was determined to be <8.4E-07 Pa (i.e., equivalent to <6.3E-09 mm Hg) at 20°C and <2.9E-06 Pa (i.e., equivalent to <2.2E-08 mm Hg) at 25°C.
Executive summary:

A study was conducted to determine the vapour pressure of the test substance according to OECD Guideline 104, EU Method A.4 and US EPA OPPTS 830.7950, in compliance with GLP. The experiment was performed using the isothermal thermogravimetric effusion method. An amount of 7.82 or 14.7 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. After the experiment, a beige residue remained in the sample container. The change of the colour indicated reaction and/or decomposition of the test substance. This was also confirmed by the higher weight loss with higher amount of test substance used in the test. The weight loss of the test substance at 170 °C, 180 °C, 190 °C and 200 °C however, was lower than the weight loss of reference substance chrysene at the same temperatures. According to this, the vapour pressure of the test substance was determined to be lower than that of chrysene. Under the conditions of the study, the vapour pressure of the test substance was determined to be < 8.4E-07 Pa (i.e., equivalent to < 6.3E-09 mm Hg) at 20°C and < 2.9E-06 Pa (i.e., equivalent to <2.2E-08 mm Hg) at 25°C (Brekelmans, 2012).

Description of key information

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

Key value for chemical safety assessment

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

Additional information