Reaction mass of 3,4,5-trichlorophthalic acid, strontium salt and 3,4,6-trichlorophthalic acid, strontium salt and 3,4-dichlorophthalic acid, strontium salt and 3,5-dichlorophthalic acid, strontium salt and 3,6-dichlorophthalic acid, strontium salt and 3-chlorophthalic acid, strontium salt and 4,5-dichlorophthalic acid, strontium salt and 4-chlorophthalic acid, strontium salt

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

Study period:

2019-10-18 to 2019-10-24

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Qualifier:

according to guideline

Guideline:

other: ASTM E 537-76

GLP compliance:

no

Type of method:

differential scanning calorimetry

Key result

Decomposition:

yes

Decomp. temp.:

> 400 °C

Remarks on result:

other: No melting point was observed before decomposition starts >400 °C.

The substance shows first a small endothermic signal between 173 °C and 202 °C which corresponds to a mass loss of 0.9 weight% in the TGA (Thermogravimetric Analysis).

This signal has not been considered as a melting point but indicates the release of unknown volatile compounds, although the test item has been previously dried.

Above 400 °C a highly exothermic decomposition reaction has been measured that is not finished at the end of the scan at 500 °C. The energy content that could be measured is already 3107 J/g, indicating most likely a REDOX reaction of the test item with the aluminum crucible. The overall loss of mass due to the decomposition of the substance is 42 weight% within the scan and 53 weight% after the end of the measurement. No melting point was measured before the decomposition starts at > 400°C.

Conclusions:

No melting point was measured for the test item before the decomposition at > 400 °C starts.

Executive summary:

The melting point of the test item has been determined by DSC measurements according to test method ASTM E 537 -76. No melting point was measured for the test item before the decomposition at > 400 °C starts.

Description of key information

The melting point of the test item has been determined by DSC measurements according to test method ASTM E 537 -76. No melting point was measured for the test item before decomposition at > 400 °C starts.