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Boiling point

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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

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 HEDP-4Na undergoes loss of water from 103°C at 981 mBar. Similarly, in available secondary sources, HEDP-xK has a reported initial boiling point of 100°C.