Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 271-794-6 | CAS number: 68608-66-2
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- August 17, 2011 - January 10, 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
- 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
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- < 0.004 Pa
- Conclusions:
- The isothermal TGA effusion method was applied for the determination of the vapour pressure of the substance, in accordance with OECD 104, EU Method A.4 and GLP. The vapour pressure of the test substance at 20°C (293K) and 25°C (293K) was < 0.0015 Pa and < 0.0042 Pa, respectively
Reference
The weight loss of the test substance at 110°C, 120°C, 130°C and 140°C was lower than the weight loss of hexachlorobenzene at the same temperatures. The results of the vapour pressure for the test substance at 20°C and 25°C are:
|
20°C |
25°C |
||
|
[Pa] |
[mm Hg] |
[Pa] |
[mm Hg] |
Test substance |
< 1.5 x 10-3 |
< 1.1 x 10-5 |
< 4.2 x 10-3 |
< 3.2 x 10-5 |
Description of key information
The vapour pressure of the substance was determined using the isothermal thermogravimetric effusion method in a GLP study according to EC A.4, OECD 104 and OPPTS 830.7950. The constants specific for the experimental arrangement were determined using a set of five reference substances. Since the substance contained a high percentage of water,the measurements were performed at temperatures > 100°C to allow the water to evaporate before measuring weight loss as a function of time. Weight losses of the substance were measured at 160°C, 170°C, 180°C and 190°C. The experiment was performed in duplicate. From all results, the vapour pressure regression curve (log PT as a function of 1/T; with T in K) of the substance was constructed. The vapour pressure of the solid, water-free part of the substance was calculated (extrapolated) from the vapour pressure curve to be 1.5E-7 Pa and 3.7E-7 Pa at 20°C and 25°C, resp.
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 20 °C
Additional information
The vapour pressure of the solid, water-free part of the substance was determined to be 1.5E-7 Pa and 3.7E-7 Pa at 20°C and 25°C, resp.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
