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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 947-519-7 | CAS number: -
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:
- 2017-07-05 - 2017-07-07
- 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)
- Version / remarks:
- as ammended of 2008-05-30
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: vapour pressure balance
- Specific details on test material used for the study:
- The vapor pressure was determined using a vapor pressure balance. The temperature of the sample was controlled electronically. The mass and temperature readings were recorded automatically into a computer file.
After evacuating the system, opening the shutter above the sample oven causes the escaping vapor jet to be directed at the scale pan. The difference in mass readings with the orifice covered and uncovered is proportional to the vapor pressure at the given oven temperature.
A preliminary run to provide additional information was performed with a sample of test item after it had been under low vacuum for approximately 8 minutes and high vacuum for approximately 10 minutes.
A definitive sequence of runs were performed at 25 °C with a fresh sample of test item after it had been under low vacuum for approximately 8 minutes and high vacuum for approximately 10 minutes. Pressure readings were taken at 25 °C with a three minute dwell between readings to allow for re-equilibration of the vapor phase.
A definitive sequence of runs were performed at 40 °C with a fresh sample of test item after it had been under low vacuum for approximately 8 minutes and high vacuum for approximately 15 minutes. Pressure readings were taken at 40 °C with a three minute dwell between readings to allow for re-equilibration of the vapor phase.
A definitive sequence of runs were performed at 75 °C with a fresh sample of test item after it had been under low vacuum for approximately 8 minutes and high vacuum for approximately 20 minutes. Pressure readings were taken at 75 °C with a three minute dwell between readings to allow for re-equilibration of the vapor phase.
A definitive sequence of runs were performed at 170 °C with a fresh sample of test item after it had been under low vacuum for approximately 8 minutes and high vacuum for approximately 30 minutes. Pressure readings were taken at 170 °C with a three minute dwell between readings to allow for re-equilibration of the vapor phase.
Data Evaluation
The vapor pressure is related to the observed mass difference by the following equation:
Vp = (dm * g) / A
where: Vp = vapor pressure (Pa)
dm = mass difference (kg)
g = acceleration due to gravity (9.813 m/s2)
A = area of the orifice (7.06858 * 10E(-6) m2) - Temp.:
- 25 °C
- Vapour pressure:
- 0.184 Pa
- Temp.:
- 40 °C
- Vapour pressure:
- 0.276 Pa
- Temp.:
- 75 °C
- Vapour pressure:
- 0.47 Pa
- Temp.:
- 170 °C
- Vapour pressure:
- 24.4 Pa
- Conclusions:
- The vapor pressure of the test item has been determined at four temperatures and the results are shown in the following table.
Temperature (°C) Temperature (K) Vapor Pressure (Pa)
25 298 0.184
40 313 0.276
75 348 0.470
170 443 24,4 - Executive summary:
The vapor pressure of the substance has been determined at four temperatures using the vapor pressure balance method, designed to be compatible with Method A.4 Vapour Pressure of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 104 of the OECD Guidelines for Testing of Chemicals, 23 March 2006.
Summary of vapor pressure
Temperature (°C) Temperature (K) Vapor Pressure (Pa) 25 298 0.184 40 313 0.276 75 348 0.470 170 443 24.4
Reference
Description of key information
The vapour pressure of the substance has been determined at four temperatures using the vapour pressure balance method, designed to be compatible with Method A.4 Vapour Pressure of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 104 of the OECD Guidelines for Testing of Chemicals, 23 March 2006.
Summary of vapour pressure
| Temperature (°C) | Temperature (K) | Vapour Pressure (Pa) |
| 25 | 298 | 0.184 |
| 40 | 313 | 0.276 |
| 75 | 348 | 0.470 |
| 170 | 443 | 24.4 |
A vapour pressure of 0.184 Pa at 25 °C corresponds to a value of 0.00138 mm Hg.
Key value for chemical safety assessment
- Vapour pressure:
- 0.184 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.
