Registration Dossier

Physical & Chemical properties

Melting point / freezing point

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010-03-15 to 2010-03-16
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 Calorimetry (DSC)
Atm. press.:
>= 1 015 - <= 1 017 hPa
Decomposition:
yes
Decomp. temp.:
ca. 370 °C
Remarks on result:
other: based on DSC-measurement, performed under nitrogen

Thermal stability:

The DSC-measurement (measured at 1015 hPa) in a closed glass crucible with the test item showed an endothermic effect in the temperature range 30 °C to 210 °C. At 260 °C another endothermic effect started. This effect was not yet finished when measurement reached maximum temperature of 400 °C. An optical inspection showed a discoloration of the test item from rose to black. However the test item was still a powder after measurement.

DSC:

Due to the optical inspection and the result of the capillary measurement it can be concluded that the test item has no melting point at atmospheric condition up to the maximum temperature of the measurement (600 °C). Due to the capillary measurement and the measurements in open aluminium crucibles it can be concluded that the test item starts to decompose at 370 °C. The endothermic effects (50 -200°C, 280 -390°C) up to this temperature based on humidity and other “low” melting impurities.

Conclusions:
The test item, Cobalt di(acetate) tetrahydrate, starts to decompose around 370 °C.

Description of key information

No melting point can be stated. Cobalt di(acetate) decomposes before melting. Temperature of decomposition: around 370 °C.

Key value for chemical safety assessment

Additional information