Registration Dossier
Registration Dossier
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EC number: 257-467-0 | CAS number: 51839-25-9
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Justification for type of information:
- Physicochemical characteristics of the substance were checked according to standard protocols and state-of-the-art scientific principles, and extensively reported with the objective to answer the information requirements for the REACH legislation.
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- GLP compliance:
- not specified
- Type of method:
- thermal analysis
- Melting / freezing pt.:
- > 225 - < 270 °C
- Atm. press.:
- ca. 1 atm
- Decomposition:
- yes
- Decomp. temp.:
- > 225 - <= 270 °C
- Remarks on result:
- other: under nitrogen atmosphere
- Melting / freezing pt.:
- > 240 - <= 268 °C
- Atm. press.:
- ca. 1 atm
- Decomposition:
- yes
- Decomp. temp.:
- > 240 - <= 268 °C
- Remarks on result:
- other: under air atmosphere
- Conclusions:
- test done according to standard protocol, useful to assess the characteristic of the substance
- Executive summary:
Zinc carbonate melts under nitrogen at 225°C. At the same temperature, decomposition starts.
Under air, zinc carbonate melts at 240°C, and decomposition starts at that temperature,too.
Reference
During the melting test of the studied zinc carbonate hydroxide hydrate sample the endothermic peak is in the curve at the temperature range 225 – 270 °C and at the same time the mass of the sample decreases very strongly. This all indicates melting to crystal water and decomposition of zinc carbonate hydroxide hydrate. During decomposition the sample evolves gases e.g. CO2and H2O.
In the oxidation test of the studied zinc carbonate hydroxide hydrate sample there is a very small negligible exothermic peak in the curve at the temperature range 182 – 195 °C and the mass of sample has increased slowly all the time. These indicate some oxidation. The endothermic peak is in the curve at the temperature range 240 – 268 °C and at the same time the mass of the sample decreases very strongly. This all indicates melting to crystal water and decomposition of zinc carbonate hydroxide hydrate. During decomposition the sample evolves gases e.g. CO2and H2O.
Description of key information
Zinc carbonate melts in air at 240°C, and decomposition starts at that temperature, too.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 240 °C
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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