Custom Red #2

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

10 February 2009 - 08 May 2009

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: This study has been performed according to OECD and EC guidelines and according to GLP principles.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2009

Report date:

2009

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

other: Differential Scanning Colorimetry

Test material

Test material information

Constituent 1

Details on test material:

- Name of test material (as cited in study report): Custom Red #2
- Substance type: violet powder
- Physical state: solid
- Purity test date: no data
- Lot/batch No.: C50APR0805D
- Expiration date of the lot/batch: 08 January 2011
- Stability under storage conditions: stable
- Storage condition of test material: at room temperature in the dark

Results and discussion

Melting / freezing point

Melting / freezing pt.:

81 °C

Atm. press.:

101.3 kPa

Any other information on results incl. tables

Main study: During the first experiment an endothermic peak was observed between 50°C and 125°C. The extrapolated onset temperature of the peak was 80.61°C. Melting of the test substance was most likely the reason for the effect. To investigate the melting peak of the test substance a repeated heating cycle at a lower heating rate was applied. With the first heating the extrapolated onset temperature of the endothermic peak was 80.05°C. The value was obtained at a heating rate of 5°C/minute. The similar value indicated that melting of the test substance was the reason for the effect. During cooling exothermic peaks between 50°C and 100°C were observed. The effects were obtained due to crystallization of the test substance. With the second heating an extrapolated onset temperature of 79.10°C was obtained. The results demonstrated that the endothermic effect was due to melting of the test substance. After the experiment, a violet molten residue remained in the sample container. The third experiment was performed to determine the duplicate melting temperature of the test substance. The temperature program was similar as the program of the first experiment. Similar results as with the first experiment were obtained.

Applicant's summary and conclusion

Conclusions:

The melting temperature of the test substance is 81°C (354 K).