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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
Reliability:
1 (reliable without restriction)
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Name CARMINE LAKE
Batch no. HPFC16006A
Composition Hydrated aluminium chelate of carminic acid (7-beta-D-glucopyranosyl- 3,5,6,8-tetrahydroxy-1-methyl-9,10-dioxo-anthracene-2-carboxylic acid)
CAS No. 1390-65-4
Purity 55% Carmine
Expiry date 12. Apr. 2020
Storage Room Temperature (20 ± 5 °C); Keep away from light

Key result
Atm. press.:
ca. 1 atm
Decomposition:
yes
Decomp. temp.:
> 34.11 - < 52.76 °C
Sublimation:
no

For the calculation of the mean and the standard deviation all three determinations were taken into account.

Beginning of Event

in °C (event mark)

in K

1 Determination

43.15

316.30

2 Determination

41.47

314.62

3 Determination

29.76

302.91

Min

29.76

302.91

Ending of Event

in °C (event mark)

in K

1 Determination

195.92

469.07

2 Determination

183.61

456.76

3 Determination

153.19

426.34

Min

153.19

426.34

Peak max

in °C

in K

1 Determination

98.46

371.61

2 Determination

90.81

363.96

3 Determination

66.62

339.77

Onset

in °C (onset)

in K

1 Determination

52.75

325.90

2 Determination

49.21

322.36

3 Determination

34.11

307.26

Min

34.11

307.26

Conclusions:
The determination of the melting and boiling point of CARMINE LAKE was performed via DSC (differential scanning calorimetry).
Based on the observations of the pre-test, the endotherm event could be indicated as de-hydration under decomposition, evaluated with onset function. Event marker function was used to evaluate the beginning and ending of the event.
Therefore no melting and no boiling point could be determined under these circumstanc-es as the test substance decomposed.

Description of key information

No melting point could be determined under these circumstances as the test substance decomposed

Key value for chemical safety assessment

Additional information