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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.

Diss Factsheets

Physical & Chemical properties

Boiling point

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Endpoint:
boiling point
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance is a solid which melts above 300°C
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
Type of method:
differential scanning calorimetry
Boiling pt.:
> 103 °C
Atm. press.:
981 mBar

The test item shows a boiling (and/or a thermal decomposition with evaporation of the decomposition components) from a subcomponent (ca. 11 wt. % - possibly water of crystallisation) earliest at ca. 103°C (at 981 mbar) according to the definition in the OECD guideline 103.

Conclusions:
HEDP-4Na shows a boiling (and/or a thermal decomposition with evaporation of the decomposition components) from a subcomponent (ca. 11 wt. % - possibly water of crystallisation) beginning at ca.103°C (at 981 mbar) according to the definition in the OECD guideline 103.

Description of key information

Boiling point: HEDP-xK is expected to melt above 450°C

Key value for chemical safety assessment

Additional information

The requirement to test the boiling point of HEDP-xK was waived because the substance is expected to have a melting temperature of >450°C (>723 K). This statement is supported by the evidence from a DSC study which demonstrates that the anhydrous form of the parent acid (HEDP-H) has a melting temperature of >450°C. The DSC thermograms show evidence of loss of water at about 100°C.

See melting point study reported in IUCLID Section 4.2.

This conclusion is supported by available data for HEDP-4Na which indicates that the test substance undergoes loss of water from 103°C at 981 mBar.

In available secondary sources to which reliability could not be assigned, aqueous solution of HEDP-xK has a reported initial boiling point of 100°C.