Dipotassium 3,4,5,6-tetrabromophthalate

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Principles of method if other than guideline:

Included thermogravimetric observations

GLP compliance:

no

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

Dried material, 98% purity
Batch LP081119

Decomposition:

yes

Decomp. temp.:

> 286 °C

Sublimation:

ambiguous

Subl. temp.:

> 286 °C

Remarks on result:

not determinable

There was a mass loss from 286 C with no clear melting transition observed prior to this point.

After the heating ramp to 800 C was complete most of the solid appeared to have decomposed, leaving only a few dark coloured spots in the pan.

The DSC trace shows a clear exotherm peak at ca 407°C with an energy of 271.4J/g. There was no remaining sample visible after this test when heated to 500 C maximum.

Conclusions:

The sample appears to decompose with weight loss from 286 C and although there was an apparent exotherm at over 400 C, it is likely that this relates to a decomposition product. After heating to 500 C, there was no visible remains of the substance.
In the thermogravimetric study, black residues were observed, even though this was heated to a maximum 800 C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

400 °C

Additional information

Figure of 400 C used for summary, but in reality, this melting transition seen by DSC may relate to a thermal degradation product.