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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
Conclusions:
The boiling point study does not need to be conducted as the substance decomposes without boiling.
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:
OECD Guideline 103 (Boiling point/boiling range)
Type of method:
other: DSC
Boiling pt.:
> 103 °C
Atm. press.:
981 mBar

The test item shows a boiling (or/ and 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:
The test item shows a boiling (or/ and 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 salt melts above 450°C.

Key value for chemical safety assessment

Additional information

The requirement to conduct a boiling point study for the substance is waived because the substance has a melting temperature of >450°C. This statement is supported by a recent, reliable DSC test which demonstrates that the parent HEDP acid does not melt below 450°C. The DSC thermograms show evidence of loss of water at about 100°C. Salts would also be expected to undergo thermal loss of water as the parent acid. 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.