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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 430-750-8 | CAS number: -
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 1999-02-15 to 1999-02-15
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- December 1992
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- July 1995
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7200 (Melting Point / Melting Range)
- Version / remarks:
- August 1996
- Deviations:
- no
- Principles of method if other than guideline:
- NA
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- capillary method
- Key result
- Decomposition:
- yes
- Decomp. temp.:
- >= 280 °C
- Sublimation:
- no
- Remarks on result:
- other: Urea 4 starts to decompose or react at temperatures above approximately 280 °C. Beginning at this temperature, Urea 4 changed from a white solid to a brown solid.
- Conclusions:
- No melting of Urea 4 was observed, but the test substance starts to decompose or react at about 280 °C using. Beginning at this temperature, Urea 4 changed from a white solid to a brown solid.
- Executive summary:
The melting point of Urea 4 was determined according to EU method A.1, OECD Guideline 102 and EPA OPPTS 830.7200 guideline. No melting of Urea 4 was observed, but the test substance starts to decompose at about 280 °C using a heating rate of 10 K/min. Beginning at this temperature, Urea 4 changed from a white solid to a brown solid.
Reference
Three independent aliquots of Urea 4 were heated each in a glass capillary in the melting point device up to about 300 °C with a heating rate of 10 K/min. No change of the appearance and the consistency of Urea 4 was observed from which a phase transition (e. g. melting or boiling) of the sample can be deduced. The sample remained solid during the whole experiment.
Description of key information
No melting of Urea 4 was observed, but the test substance starts to decompose at about 280 °C using a heating rate of 10 K/min. Beginning at this temperature, Urea 4 changed from a white solid to a brown solid.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 215 °C
Additional information
The melting point of Urea 4 was determined according to EU method A.1, OECD Guideline 102 and EPA OPPTS 830.7200 guideline. No melting of Urea 4 was observed, but the test substance starts to decompose at about 280 °C using a heating rate of 10 K/min. Beginning at this temperature, Urea 4 changed from a white solid to a brown solid.
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.
