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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:

18 November 2020 - 10 March 2021

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

July 27, 1995

Deviations:

no

GLP compliance:

no

Remarks:

The study was conducted in a laboratory that operates in accordance with GLP principles; however, no claim of GLP compliance was intended nor is made for this study.

Type of method:

pour point

Specific details on test material used for the study:

EC No.: 950-853-6
Appearance/Physical state: solid (deliquescent)*
Batch: 209-653 (dried material from [Tradename] batch number 0001569403)
Purity: ~94.5%*
Expiry / Retest date: 03 December 2021
Storage conditions: ambient temperature, in the dark, under nitrogen

* As the test item is a deliquescent solid and the samples used in this study were all viscous liquids, it indicates the solid had absorbed up to 10% water. The purity of the liquid samples was therefore 85.05%.

Key result

Remarks on result:

not determinable

Remarks:

The test item may not have a definitive melting point but instead decomposes.

The results of the main test are shown in the following table:

Observation	Determination 1	Determination 2
Stationary point (°C)	-9.0	-9.0
Pour point (°C)	-6.0	-6.0

 

Overall pour point result: -6 ± 3 °C (267 ± 3 K)

Conclusions:

The pour point of the test item has been determined to be -6 ± 3 °C (267 ± 3 K). Test item may not have a definitive melting point but instead decomposes.

Executive summary:

The melting point determination was carried out by the pour point method, using a procedure designed to be compatible with Method 102 of the OECD Guidelines for Testing of Chemicals, 27 July 1995.

 

The sample from the preliminary test was heated to 46 °C in a water bath set at 48 °C before being allowed to cool in air. At 35 °C the sample was transferred to an ice/water bath maintained at -1 to 2 °C. At 10 °C the sample was transferred to a dry ice/acetone bath maintained at -18 to -15 °C. At -7 °C the sample was transferred to a dry ice/acetone bath maintained at -35 to -32 °C.
Starting at 3 °C and at intervals of 3 °C, the sample was tilted to a horizontal position for a period of 5 seconds during which time the sample was observed for signs of flow. The sample was continued to be observed until the test item was no longer mobile. The determination was carried out in duplicate.

 

The pour point of the test item has been determined to be -6 ± 3 °C (267 ± 3 K). The presence of up to 10% absorbed moisture in the test item will have affected the test result as the test item would have been a solid if it contained no absorbed moisture. Considering the Boiling Point test data, no melting point was evident in Determination 6 when the absorbed moisture had been driven off. Therefore, the test item may not have a definitive melting point but instead decomposes.

Description of key information

The pour point of the test item has been determined to be -6 ± 3 °C (267 ± 3 K). Test item may not have a definitive melting point but instead decomposes.