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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:

January the 30th, 2014

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

adopted July 27, 1995

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7200 (Melting Point / Melting Range)

GLP compliance:

yes (incl. QA statement)

Type of method:

capillary method

Specific details on test material used for the study:

Test Item was used in its initial form.

Decomposition:

yes

Decomp. temp.:

272 °C

Mean of the detected melting temperature values is 272 °C (545 K). At the end of the test the test item blackened and moved to the upper part of the capillary. Based on this observation and the high standard deviation of the replicate measurements the 272 °C is considered to be a decomposition temperature.

Measured temperatures corresponding to the decomposition (temp. 1./2./3.) of Yellow LF 6881 (three experiments (I, II, III) with three parallel samples each (1, 2, 3)

Sample	Temperature (°C)	Mean (°C)	Standard Deviation	Confidence interval (95 %)
I/1	273.3	271.7	2.40	1.84
I/2	270.1
I/3	276.2
II/1	272.0
II/2	267.4
II/3	270.7
III/1	271.1
III/2	272.0
III/3	272.4

 

Conclusions:

Substance decomposes at 272 °C

Executive summary:

The test item melting point was investigated according to OECD Test Guideline 102. A small amount of test item was charged in a capillary glass tube of a diameter of about 2 mm and packed tightly to obtain a filling level of approximately 5 mm. The tube was heated in the oven of the melting point device.In the main analysis, three capillaries containing the test item were placed into the apparatus, the block was heated from 264 °C to 300 °C at 0.5 °C/min heating rate. The transformations of the test item were observed by photosensors. Three parallel experiments were carried out and in each case three parallel samples were measured.

Mean of the detected melting temperature values is 272 °C (545 K). At the end of the test, the substance blackened and moved to the upper part of the capillary. Based on this observation and the high standard deviation of the replicate measurements the 272 °C is considered to be a decomposition temperature.

Conclusion

Substance decomposes at 272 °C

Description of key information

Substance decomposes before melting (at ca 200 °C)

Additional information

Capillary test method and DSC analysis - OECD 102 and 113