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Melting point / freezing point

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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.
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
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.
according to guideline
EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
>= 723 K
Remarks on result:
other: No atmospheric pressure was recorded for this endpoint.


Please see Attachment 1 for Thermograms and thermographic data for Determinations 1 and 2.

The melting/freezing temperature of the test item has been determined to be not less than 450°C (723K).
Executive summary:


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.


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.


The melting/freezing temperature of the test item has been determined to be not less than 450°C (723K).

Description of key information

Melting point/freezing point (HEDP acid): >450°C (Tremain 2010)

Key value for chemical safety assessment

Additional information

HEDP-H has been demonstrated not to melt below 450ºC. The DSC thermograms show evidence of loss of water at about 100°C. This result has been reported in an up to date study which was conducted by differential scanning calorimetry (DSC) using ASTM E537-86 method. The result is considered as reliable and has therefore been assigned as key study.

In available secondary sources to which reliability could not be assigned, melting/freezing temperature values of <-10°C, -25°C and approximately -40°C were reported for the submission substance. Also, decomposition temperatures of >200°C, 198 -199°C and approximately 228°C were reported for HEDP-H.