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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
June 12, 2017 - July 21, 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Decomposition:
yes
Decomp. temp.:
> 245 °C

Melting point / melting range: DSC measurement

Two DSC measurements with a heating rate of 10 K/min showed no endothermal effects. An exothermal effect was observed in the temperature range of 245 – 280 °C. The results of the DSC measurements are summarized inTable 1.

Table1: Melting point (DSC measurements)

Ident No.

Test item /

mg

Starting temperature /

°C

Final test temperature /

°C

Temperature range (endo-thermal) /

°C

Onset (melting) / °C

Crucible

Observations after the measurement

36310

7.61

25

500

-

-

Aluminium with a hole

Black residue

36311

5.94

25

280

-

-

Aluminium with a hole

Black residue

No endothermal effects were observed before the exothermal effect. The DSC measurements showed therefore no melting before the decomposition started. The test item had no melting point under atmospheric conditions.

Executive summary:

The test item Disperse Yellow 79 had no melting point under atmospheric conditions.

Description of key information

The test item Disperse Yellow 79 had no melting point under atmospheric conditions.

Key value for chemical safety assessment

Additional information