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Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Remarks:

melting point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From 19 December 2018 to 22 February 2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

not specified

GLP compliance:

no

Remarks:

The study was conducted in a facility which operates in accordance with Good Laboratory Practice principles; however no claim of GLP compliance was intended nor is made for this study

Type of method:

differential scanning calorimetry

Key result

Melting / freezing pt.:

ca. 31 - ca. 121 °C

Atm. press.:

ca. 100 kPa

Results

For the thermograms and thermographic data for Determinations 1 and 2, kindly refer the attached background material section of the IUCLID.

Thermographic Data

Thermal Event	Interpretation	Temperature (°C)
		Determination 1	Determination 2
Endotherm	Onset of melting	31.11	31.43
	Endset of melting	119.81	120.67

Atmospheric pressure:  100 kPa

Melting temperature: over the range 31 to 121 °C (304 to 395 K)

Discussion

From observing the thermograms, it appeared that the endotherm indicated that the test substance melted over a broad range. To confirm this, the test substance was observed after the main part of the endotherm (70 °C) and at the end of the endotherm (130 °C). After being heated to 70 °C the test substance was a white waxy residue that appeared to have softened. However, after being heated to 130 °C the test substance was a white waxy residue that lay around the periphery of the crucible demonstrating that the test substance had fully liquefied by 130 °C.

The test substance softened gradually over a broad temperature range with apparently 3 or 4 observable phases in the thermograms. This may have been due to not only the test substance being a mixture of components, but also components having different organic functional groups. Therefore, each component or group of components could have their own melting temperature resulting in the test substance not completely melting until 121 °C. This effect resulted in the test substance gradually softening rather than a sudden complete melt over a short temperature range.

Conclusion

The melting point of the test substance has been determined to be over the range 31 to 121 °C (304 to 395 K).

Conclusions:

Under the study conditions, the melting point range of the test substance was determined to be 31 to 121°C.

Executive summary:

A study was conducted to determine the melting point of the test substance according to OECD Guideline 102, using differential scanning calorimetry. The melting point range of the test substance was determined to be 31 to 121°C (Envigo, 2019).

Description of key information

The melting point of the test substance was determined using the differential scanning calorimetry method, according to OECD Guideline 102 (Envigo, 2019).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

31 °C

Additional information

Melting point range: 31 to 121°C