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EC number: 701-238-4 | 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:
- Testing was conducted between 31 March 2010 and 24 August 2010.
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Remarks:
- Study conducted in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of the relevant results. The study report was conclusive and done to a valid guideline.
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- ASTM E537-86
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- >= 723 K
- Decomposition:
- no
- Sublimation:
- no
- Remarks on result:
- other: No atmospheric pressure was recorded for this endpoint.
- Conclusions:
- The melting/freezing temperature of HEDP-H has been determined to be not less than 450°C (723K) at 1013 hPa. The result is considered to be reliable.
- Executive summary:
Introduction
General physico-chemical properties of the test item have been determined.
Methods employed are designed to be compatible with those specified in Commission Regulation (EC) No 440/2008 of 30 May 2008, Part A: Methods for the determination of physico-chemical properties.
Method
The determination was carried out by differential scanning calorimetry (DSC) using the procedure specified in ASTM E537-86 designed to be compatible with Method A1 Melting/Freezing Temperature ofCommissionRegulation (EC) No 440/2008 of 30 May 2008.
Conclusion
The melting/freezing temperature of the test item has been determined to be not less than 450°C (723K).
Reference
Results:
Please see Attachment 1 for Thermograms and thermographic data for Determinations 1 and 2.
Description of key information
Melting point: The acid form [HEDP-H] was observed to have a melting/freezing temperature of >450°C (>723 K). This conclusion is read across to the salt to indicate that HEDP (2-3Na) will also have a melting temperature of >450 °C (>723 K).
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 450 °C
Additional information
The melting point of the anhydrous form of the parent acid (HEDP-H) was determined using differential scanning calorimetry (DSC) in accordance with ASTM E537-86 test method and in compliance with GLP. HEDP-H (anhydrous form) was observed to have a melting/freezing temperature of >450°C (>723 K). The DSC thermograms show evidence of loss of water at about 100°C.
This result is read-across to the salt, HEDP (2-3Na); the salt will have a higher melting point than the parent acid. Salts would be expected to melt at a higher temperature than the parent acid, and to decompose on heating.
This conclusion is supported by available data for HEDP-4Na which indicates that the test substance shows no melting up to 500°C at 1013 hPa.
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