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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:
2009-10-21 to 2009-11-12
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline study.
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
no
Type of method:
thermal analysis
Remarks:
differential scanning calometry (DSC)
Atm. press.:
ca. 1 002 hPa
Decomposition:
yes
Decomp. temp.:
ca. 125 °C
Remarks on result:
other: based on DSC-measurement, performed under nitrogen

Thermal stability:

The DSC-measurement in a closed glass crucible with the test item showed no endothermic or exothermic effect, respectively.

DSC:

The DSC-measurement in aluminium crucible (measured at 999 hPa) with a hole with the test item showed two exothermic effects in the temperature range 290 °C to 420 °C and 420 °C to 460 °C, respectively. The second DSC-measurement in aluminium crucible (measured at 1002 hPa) with a hole with the test item showed an indistinct course of the base line.

The two DSC-measurements in open glass crucibles (measured at 1002 hPa and unknown (the exact pressure can not be reported anymore due to the loss of the measurement form; the results from the measurement are not influenced by this loss)) showed multiple endothermic effects in the temperature range 40 °C to 200 °C. Over 370 °C the course of the base line is indistinctive.

Due to the different courses of the DSC-measurements in different crucibles and the capillary measurement it can be concluded that the test item reacts with the aluminium crucible, due to the chemical reaction of the test substance with water which results in neodecanoic acid. This acid is seen to be corrosive to different metals, amongst other aluminium.

The measurement in the open glass crucible showed an endothermic effect with an onset temperature of 57°C (melting point of neodecanoic acid; assumed) and could therefore be assigned to the melting point of neodecanoic acid. During one of the measurements in the open glass crucible the test item melted and and at the same time overflowed the crucible. The second endothermic effect (onset 125°C) resulted due to the decomposition of the test substance under evaporation of decomposition products.

Conclusions:
Under the described test conditions the test item, cobalt, borate neodecanoate complexes, decomposes before melting at approximately 125°C.

Description of key information

No melting point can be stated. Cobalt borate neodecanoate decomposes before melting. Temperature of decomposition: ca. 125 °C.

Key value for chemical safety assessment

Additional information

The melting point of the test substance was determined according to OECD guideline 102 with the differential scanning calorimetry method (DSC). The test item was heated up from ambient to the final temperature (250 °C and 500 °C, respectively) at a constant heating rate (10 K/min) in a defined atmosphere (nitrogen). The quantity of heat absorbed or released was measured and recorded. Aluminium crucibles with a small hole were used as containers for the test item and as empty reference crucible.

A measurement in a capillary tube in a metal block was used to clarify the results from the DSC-measurement. The maximum temperature of this equipment is limited to 400 °C. Set point and maximum temperature were chosen according to the results of the DSC measurements.

The results from both measurements showed that cobalt, borate neodecanoate complexes, decomposes before melting at approximately 125°C.