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EC number: 242-177-9 | CAS number: 18297-63-7
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:
- 25 to 28 Jun 2019
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- Medicines & Healthcare products Regulatory Agency (MHRA)
- Type of method:
- effusion method: vapour pressure balance
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 0.008 Pa
Reference
Results
Recorded temperatures, mass differences and the resulting calculated values of vapor pressure were converted in graphs. The vapour pressure values at 25 °C, which were extrapolated from each graph, are shown in the following table.
Summary of Vapour Pressure Data
Run |
Log10 [ Vp (25 °C) ] |
2 |
-2.06 |
3 |
-2.07 |
4 |
-2.14 |
5 |
-2.06 |
7 |
-2.09 |
8 |
-2.04 |
9 |
-2.08 |
10 |
-2.10 |
Mean |
-2.08 |
Vapour pressure |
8.35E-03 Pa |
Discussion
The test item did not change in appearance under the conditions used in the determination.
Testing was performed over the relatively low temperature range of 30 °C to 40 °C due to the test item blocking the shutter mechanism at higher temperatures. The nature of the plots obtained is directly related to this use of low temperature, however, the plots are deemed suitable for use.
The results may represent rounded values obtained by calculations based on the exact raw data.
Conclusion
The vapor pressure of the test item has been determined to be 8.35E-03 Pa at 25 °C.
Description of key information
1,3-bis(trimethylsilyl)urea: 8.35E-03 Pa at 25 °C (OECD 104, vapour pressure value)
Key value for chemical safety assessment
- Vapour pressure:
- 0.008 Pa
- at the temperature of:
- 25 °C
Additional information
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.
