Registration Dossier
Registration Dossier
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EC number: 267-956-0 | CAS number: 67953-76-8
Boiling point
Administrative data
Link to relevant study record(s)
- 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
- 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.
Referenceopen allclose all
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.
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.
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