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EC number: 220-813-6 | CAS number: 2905-62-6
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
The vapour pressure of the test material was determined to be ≤4.8 Pa (≤3.6 x 10^-2 mm Hg) at 20 °C, and ≤8.4 Pa (≤6.3 10^-2 mm Hg) at 25 °C.
Key value for chemical safety assessment
- Vapour pressure:
- 8.4 Pa
- at the temperature of:
- 25 °C
Additional information
The vapour pressure of the test material has been investigated in a study which was performed under GLP conditions and in accordance with the standardised guidelines OECD 104, EU Method A.4 and US EPA OPPTS 830.7950 (Oudhoff, 2016). The study has been assigned a reliability score of 1 in line with the principles for assessing data quality as defined by Klimisch et al. (1997).
The isothermal TGA effusion method was applied for the determination of the vapour pressure of the test material. The validity of the method was verified a maximum of one month before this study using hexachlorobenzene as reference control substance.
An amount of 28.2 or 35.4 mg of the test material was applied to the surface of a roughened glass plate as a homogeneous layer. The weight loss of the test material was measured continuously as a function of time at defined isothermal temperatures. The evaporation rate of the test material (νT) was calculated from the weight loss of the compound. The PT values at the defined isothermal temperatures were determined using the vapour pressure equation with the constants c and d specific for the experimental arrangement.
Linear regression analysis of the log PT values and 1/T was performed using a least squares method. The PT values of the test material at 20 and 25 °C were determined using the vapour pressure regression curve.
Under the conditions of the study, the vapour pressure of the test material was determined to be ≤4.8 Pa (≤3.6 x 10^-2 mm Hg) at 20 °C, and ≤8.4 Pa (≤6.3 10^-2 mm Hg) at 25 °C.
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