CTO

Melting point / freezing point

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

16th February 2018 to 21st February 2018

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

unsuitable test system

Justification for type of information:

Melting point was already determined to be greater than 1000 °C based on testing via thermogravimetric analysis, which has a maximum measurement temperature of 1000 °C. Therefore, an attempt was made to melt the substance in a furnace using temperatures of up to 1050 °C.

Qualifier:

according to guideline

Guideline:

other: Internal method

Version / remarks:

attempt was made to melt the substance in a furnace using temperatures of up to 1050 °C

Principles of method if other than guideline:

The material was heated in a furnace until signs of melting were observed.
Three seperate firings were attempted, one at 1000 °C, one at 1040 °C and one at 1050 °C.

GLP compliance:

no

Type of method:

other: Heating within furnace with observation of melting.

Specific details on test material used for the study:

Batch number B1759

Key result

Melting / freezing pt.:

>= 1 040 - <= 1 050 °C

At 1040 °C no sign of melting was observed on removal from the furnace, whereas at 1050 °C, the substance has melted.

Conclusions:

Melting point had previously been determined to be greater than 1000 °C based on testing via thermogravimetric analysis, the equipment for which has a maximum measurement temperature of 1000 °C. Therefore, an attempt was made to melt the substance in a furnace using temperatures of up to 1050 °C.

At 1040 °C no sign of melting was observed on removal from the furnace, whereas at 1050 °C, the substance has melted. Therefore, melting point is determined to be somewhere between 1040 and 1050 °C.

Executive summary:

Melting point had previously been determined to be greater than 1000 °C based on testing via thermogravimetric analysis, the equipment for which has a maximum measurement temperature of 1000 °C. Therefore, an attempt was made to melt the substance in a furnace using temperatures of up to 1050 °C.

 

At 1040 °C no sign of melting was observed on removal from the furnace, whereas at 1050 °C, the substance has melted. Therefore, melting point is determined to be somewhere between 1040 and 1050 °C.

Reference 2

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

weight of evidence

Study period:

2017, no specific date given

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

documentation insufficient for assessment

Justification for type of information:

Data is a simple graph resulting from a thermogravimetric analysis (TGA) conducted on the substance.
The information is basic with no methodology indicated, nor any details on the test substance.

Reason / purpose for cross-reference:

other: Supporting study

Qualifier:

according to guideline

Guideline:

other: Internal Company test method

Deviations:

not specified

Principles of method if other than guideline:

information is basic with no methodology indicate

GLP compliance:

not specified

Type of method:

thermal analysis

Specific details on test material used for the study:

information is basic with no details on the test substance

Melting / freezing pt.:

> 1 000 °C

Decomposition:

no

Sublimation:

no

Conclusions:

The substance did not melt under the test conditions up to the limit of the test equipment which was 1000 °C.
No self-ignition was observed under the test conditions up to the limit of the test equipment which was 1000 °C.
No decomposition was observed under the test conditions up to the limit of the test equipment which was 1000 °C.

Executive summary:

The substance did not melt under the test conditions up to the limit of the test equipment which was 1000 °C.

No self-ignition was observed under the test conditions up to the limit of the test equipment which was 1000 °C.

No decomposition was observed under the test conditions up to the limit of the test equipment which was 1000 °C.

Description of key information

Results from thermogravimetric analysis showed that the test substance did not melt under the test conditions up to the limit of the test equipment (1,000 °C). No self-ignition was observed under the test conditions up to the limit of the test equipment (1,000 °C). No decomposition was observed under the test conditions up to the limit of the test equipment (1,000 °C). An additional study was conducted to determine the melting point of the test substance. An attempt was made to melt the substance in a furnace using temperatures of up to 1,050 °C. At 1,040 °C no sign of melting was observed on removal from the furnace, whereas at 1,050 °C, the substance has melted. Therefore, melting point is determined to be somewhere between 1,040 and 1,050 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

1 040 °C