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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
09 August 2017 - 28 November 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study was conducted in accordance with international guidelines and in accordance with GLP. All guideline validity criteria were met.
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
Regulation (EC) 440/2008 of 30 May 2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
27 July 1995.
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
capillary method
Remarks:
Melting temperature devices with metal block as per Regulation (EC) 440/2008, Method A.1.
Key result
Melting / freezing pt.:
161.7 °C
Atm. press.:
ca. 101 325 Pa
Decomposition:
no

Preliminary Test:

The test item was put into the capillary tube so that the filling level was approximately 4 to 6 mm. Then the filled capillary tube was placed in the metal heating block of the instrument.

 

The test was started at 30 °C. The heating rate was 5 K/min. The melting was observed at 161.9 °C.

 

 

Main Test:

The test was started at 150 °C with a heating rate of 0.5 K/min.

 

The following results were observed:

 

Table 4:          Results of the Main Test

Main test

Melting temperature

No.

[K]

[°C]

1

434.9

161.7

2

434.8

161.6

3

434.9

161.7

Mean:

434.9

161.7

 

 

Conclusions:
The test item has a mean melting point of 161.7 °C ± 0.5 °C (434.9 K ± 0.5 K).
Executive summary:

EU Method A.1. – The melting point of the test item was determined using the capillary method.  The procedure employed was designed to be compatible with Method A.1. Melting/Freezing Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008.


 


Aliquots of test item (4 – 6 mm) were placed in capillary tubes fused at one end and subjected to heating at a rate of 0.5 K/min from a temperature of 10 K below the test item melting temperature determined during a preliminary test.  Heating was continued until melting of the sample was observed.  The main test was performed three times.


 


The mean melting temperature of the test item was established as being 161.7 °C ± 0.5 °C.

Description of key information

Melting Point: 161.7°C ± 0.5 °C (434.9 K ± 0.5 K); EU Method A.1.; C Bär (2017)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
161.7 °C

Additional information

EU Method A.1. – The melting point of the test item was determined using the capillary method.  The procedure employed was designed to be compatible with Method A.1. Melting/Freezing Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008.


 


Aliquots of test item (4 – 6 mm) were placed in capillary tubes fused at one end and subjected to heating at a rate of 0.5 K/min from a temperature of 10 K below the test item melting temperature determined during a preliminary test.  Heating was continued until melting of the sample was observed.  The main test was performed three times.


 


The mean melting temperature of the test item was established as being 161.7 °C ± 0.5 °C.