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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 231-445-0 | CAS number: 7554-65-6
Vapour pressure
Administrative data
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Non-guideline study, available as unpublished report adequate for assessment.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 992
- Report date:
- 1992
Materials and methods
Test guideline
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- dynamic method under argon
- GLP compliance:
- not specified
- Type of method:
- dynamic method
- Remarks:
- under argon
Test material
- Reference substance name:
- 4-methylpyrazole
- EC Number:
- 231-445-0
- EC Name:
- 4-methylpyrazole
- Cas Number:
- 7554-65-6
- Molecular formula:
- C4H6N2
- IUPAC Name:
- 4-methyl-1H-pyrazole
- Test material form:
- other: liquid
- Details on test material:
- Name of test material (as cited in study report): 4-Methylpyrazol
Analytical purity: 99,3% (by GC)
Constituent 1
Results and discussion
Vapour pressureopen allclose all
- Temp.:
- 20 °C
- Vapour pressure:
- 0.071 hPa
- Remarks on result:
- other: calculated from the regression equation
- Temp.:
- 25 °C
- Vapour pressure:
- 0.114 hPa
- Remarks on result:
- other: calculated from the regression equation
- Temp.:
- 50 °C
- Vapour pressure:
- 0.878 hPa
- Remarks on result:
- other: calculated from the regression equation
Any other information on results incl. tables
Results:
Temperature [°C] |
Vapour pressure (exp.) [hPa] |
Vapour pressure (calc.) [hPa] |
Aberration [%] |
51.67 |
1.00 |
0.992 |
0.77 |
61.74 |
2.00 |
2.00 |
-0.07 |
67.96 |
3.00 |
3.01 |
-0.18 |
76.22 |
5.00 |
5.01 |
-0.22 |
81.96 |
7.00 |
7.02 |
-0.31 |
88.32 |
10.00 |
10.04 |
-0.43 |
101.44 |
20.00 |
20.02 |
-0.12 |
109.74 |
30.00 |
30.05 |
-0.16 |
120.84 |
50.00 |
50.02 |
-0.05 |
128.57 |
70.00 |
69.89 |
0.16 |
137.23 |
100.0 |
99.79 |
0.21 |
155.43 |
200.0 |
199.2 |
0.40 |
167.11 |
300.0 |
299.3 |
0.23 |
182.95 |
500.0 |
499.5 |
0.10 |
194.19 |
700.0 |
700.5 |
-0.07 |
206.90 |
1000.0 |
1004.0 |
-0.37 |
207.25 |
- |
1013.25 |
- |
The regression of the results leads with a mean deviation of 0.24 % to the following equation:
ln(p/hPa) = 11.0500 - 4452.20 / (206.90 + t/°C)
The vapour pressure at 20 °C, 25 °C and 50°C was calculated from the regression equation.
Applicant's summary and conclusion
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.
