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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:
29 May 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
Commission Regulation (EC) No 440/2008 of 30 May 2008 laying down test methods pursuant to Regulation (EC) No 1907/2006 of the European Parliament and of the Council on the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH), Method A.1, Official Journal of the European Union L 142 of 31 May 2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
Organisation for Economic Co-operation and Development (OECD), Guidelines for Testing of Chemicals, Guideline No. 102, “Melting Point / Melting Range”; adopted July 27, 1995
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
capillary method
Specific details on test material used for the study:
No further details specified in the study report.
Key result
Melting / freezing pt.:
> 82.7 - < 83.9 °C
Decomposition:
no
Sublimation:
no

Using a linear heating rate of 0.5 °C/min, the melting range of 6,6’-di-tert-butyl-2,2’-thiodi-p-cresol was found to be 82.7 – 83.9 °C ± 0.24 °C (95% confidence interval), i.e. 355.8 – 357.0 K.

 

Measured temperature corresponding to the melting of the test item (three experiments (I, II, III) with three parallel sample each (1, 2, 3)

 

Measured Temperature during the Main Study (°C)

I / 1

I / 2

I / 3

II / 1

II / 2

II / 3

III / 1

III / 2

III / 3

Mean

Beginning of melting

83.1

83.0

83.1

82.5

82.5

82.5

82.5

82.4

82.3

82.7 ± 0.24

Final stage of melting

83.9

83.9

83.9

83.8

83.8

83.9

83.9

83.8

83.8

83.9 ± 0.04

 

No significant change of colour or other changes suggesting degradation were observed.

Conclusions:
Using a linear heating rate of 0.5 °C/min, the melting range of 6,6’-di-tert-butyl-2,2’-thiodi-p-cresol was found to be 82.7 – 83.9 °C ± 0.24 °C
Executive summary:

For the determination of the melting point or melting range, the capillary method using a metal block was applied.

Using a linear heating rate of 0.5 °C/min the melting range of 6,6’-di-tert-butyl-2,2’-thiodi-p-cresol was found to be 82.7 – 83.9 °C ± 0.24 °C (95% confidence interval), i.e. 355.8 – 357.0 K.

Description of key information

For the determination of the melting point or melting range, the capillary method using a metal block was applied.

Using a linear heating rate of 0.5 °C/min the melting range of 6,6’-di-tert-butyl-2,2’-thiodi-p-cresol was found to be 82.7 – 83.9 °C ± 0.24 °C (95% confidence interval), i.e. 355.8 – 357.0 K.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
82.7 °C

Additional information

No significant change of colour or other changes suggesting degradation were observed.