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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 231-449-2 | CAS number: 7558-80-7
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:
- Testing was conducted between 29 September 2009 and 15 October 2009
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- Date of GLP inspection: 19 August 2008 Date of Signature on GLP certificate: 04 March 2009
- Type of method:
- thermal analysis
- Remarks:
- differential scanning calorimetry (DSC)
- Melting / freezing pt.:
- > 723 K
- Conclusions:
- The test material was determined to have a melting temperature greater than 723 K. Although the test material was identified as undergoing stepwise dehydration from approximately 327 K, with a minimum of five stepwise losses seen at approximately 327 K, 475 K, 559 K, 584 K and 614 K. No phase transition (i.e. melting) of the test material was associated with these thermal events.
This study is conducted according to an appropriate guideline and under the conditions of GLP and therefore the study is considered to be acceptable and to adequately satisfy both the guideline requirement and the regulatory requirement as a key study for this endpoint. - Executive summary:
Method
The determination was carried out by differential scanning calorimetry (DSC) using the procedure specified in ASTM E537-86, Method A1 Melting/Freezing Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008.
Conclusion
The test material was determined to have a melting temperature greater than 723 K. Although the test material was identified as undergoing stepwise dehydration from approximately 327 K, with a minimum of five stepwise losses seen at approximately 327 K, 475 K, 559 K, 584 K and 614 K. No phase transition (i.e. melting) of the test material was associated with these thermal events.
Reference
Description of key information
The melting point of sodium dihydrogenorthophosphate was determined according to EU Method A.1 (Melting / Freezing Temperature) and under the conditions of GLP.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 450 °C
Additional information
The test material was determined to have a melting temperature greater than 723 K. Although the test material was identified as undergoing stepwise dehydration from approximately 327 K, with a minimum of five stepwise losses seen at approximately 327 K, 475 K, 559 K, 584 K and 614 K. No phase transition (i.e. melting) of the test material was associated with these thermal events.
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.
