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Physical & Chemical properties

Explosiveness

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Description of key information

HEBMP-H is not explosive.

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

The molecule has no chemical groups that are associated with explosive properties. Therefore, in accordance with Column 2 of REACH Annex VII, there is no need to conduct the explosive properties study.

In solution, HEBMP-H (CAS 5995-42-6) undergoes a reversible internal condensation reaction to form a pH-dependent equilibrium mixture with the cyclised structure 4-(Phosphonomethyl)-2-hydroxy-2-oxo-1,4,2-oxaza-phosphorinane (CAS 32422-02-9, c-HEBMP) and water. The precise proportion of the two forms is dependent on pH, temperature and time, and under acidic or neutral conditions, the proportion of c-HEBMP in the multi-constituent substance may reach proportions as high as ≥50% w/w. Spectroscopic evidence from 31P-NMR analysis suggests that in the pH range ca. 1 – 7 a high proportion (50-75% w/w) is present as the cyclised form. The two forms exist in equilibrium therefore it is extremely difficult to separate and purify both forms. The properties of the whole substance, in which both forms are present at representative levels, are used in the chemical safety assessment.

Justification for classification or non-classification

There is no evidence to suggest that the substance should be classified for this endpoint.