Diammonium tartrate

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:

2015-10-23 to 2015-11-04

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to other study

Remarks:

4.1-1

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

GLP compliance:

no

Type of method:

differential scanning calorimetry

Key result

Decomposition:

yes

Decomp. temp.:

> 215 - < 260 °C

Remarks on result:

other: Test item decomposed to black residues, mass loss about 91%

One DSC measurement with a heating rate of 10 K/min showed an endothermal effect in the temperature range 215 - 260 °C. However only some decomposed black particles remained of the test item after the measurement and a mass loss of approximately 91% was observed.

An additional measurement with capillary method was performed in order to clarify the melting. Since this measurement was performed only as a verifying screening a high heating rate of 10 K/min was chosen and therefore the absolute temperature values derived with the capillary method are not as accurate as the DSC results. The filling height of the test item was approximately 5 mm. By the capillary method DSC data were confirmed: No melting occurs, instead substance decomposes before melting or boling could occur. The results in capillary test showed at 227°C decomposing with dark dots of test substance, at 234°C test item discoloured to grey, at 245°C discoloration to black at 255°C decomposed substance starts to melt and boil.

Description of key information

Substance decomposes at about 215°C

Additional information

A study was conducted according to EU Method A.1 and OECD guideline 102 up to 500°C. In the Differential Scanning Calorimetry measurements according to EU A.1 substance decomposition starts at 215°C with a mass loss of about 91%. These results were confirmed by the capillary method showing decoloration beginning at the same temperature range with melting and boiling of the black residue at 250°C.