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Diss Factsheets

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:
04 September 2017 - 01 November 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:
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:
Differential scanning calorimetry (thermal analysis) and a modified capillary / liquid bath method (visual evaluation)
Specific details on test material used for the study:
- Source and lot/batch No.of test material: A065/99
- Expiration date of the lot/batch: 1st July 2019
- Purity: UVCB
Key result
Melting / freezing pt.:
131 °C
Decomposition:
yes

The test item was determined to potentially lose a volatile fraction at approximately 131°C, before rapidly decomposing, prior to melting, with further, ongoing decomposition being evident as heating of the test item continued. Testing was performed by differential scanning calorimetry (thermal analysis) a modified capillary method with liquid bath (visual evaluation),

Conclusions:
The melting point of the test item could not be determined. The test item was determined to potentially lose a volatile fraction at approximately 131°C, before rapidly decomposing, prior to melting, with further, ongoing decomposition being evident as heating of the test item continued.
Executive summary:

The melting point of naphthenic acids, lithium salts was determined in a GLP-compliant study following OECD guideline 102. The test item was determined to potentially lose a volatile fraction at approximately 131°C, before rapidly decomposing, prior to melting, with further, ongoing decomposition being evident as heating of the test item continued. Testing was performed by differential scanning calorimetry (thermal analysis) a modified capillary method with liquid bath (visual evaluation),

Description of key information

The melting point of the test item could not be determined. The test item was determined to potentially lose a volatile fraction at approximately 131°C, before rapidly decomposing, prior to melting, with further, ongoing decomposition being evident as heating of the test item continued.

Key value for chemical safety assessment

Additional information

The melting point of naphthenic acids, lithium salts was determined in a GLP-compliant study following OECD guideline 102. The test item was determined to potentially lose a volatile fraction at approximately 131°C, before rapidly decomposing, prior to melting, with further, ongoing decomposition being evident as heating of the test item continued. Testing was performed by differential scanning calorimetry (thermal analysis) and a modified capillary method with liquid bath (visual evaluation).

The melting points of the representative structures of lithium naphthenate were estimated using a QSAR model (MPBPVP v1.43 in EPISuite v4.11, US EPA 2010). The melting points of the representative structures for lithium naphthenate are estimated to be in the range of -20.85 - 262.29°C.