Registration Dossier
Registration Dossier
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EC number: 241-012-8 | CAS number: 16941-92-7
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:
- other: GLP compliant, guideline study, available as an unpublished report, acceptable without restrictions
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- other: ASTM E537-86, designed to be compatible with Method A1 Melting/Freezing Temperature of Commission Regulation(EC) No 440/2008 and Method 102 of OECD Guidelines for Testing of Chemicals
- Deviations:
- not specified
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- other: Differential scanning calorimetry (DSC) using the procedure specified in ASTM E537-86
- Melting / freezing pt.:
- > 450 °C
- Decomposition:
- yes
- Decomp. temp.:
- 80 °C
- Remarks on result:
- other: No definitive signs of melting below 450°C
- Conclusions:
- Hexachloroiridic acid, Hydrogen hexachloroiridate (IV) decomposed from approximately 80°C with no definitive signs of melting below 450°C.
- Executive summary:
This is a GLP compliant, guideline study considered suitable for use as the key study for this endpoint. Hexachloroiridic acid, Hydrogen hexachloroiridate (IV) decomposed from approximately 80°C with no definitive signs of melting below 450°C.
Reference
As the test item was known to have a corrosive effect on aluminium (and steel), gold crucibles were used. As a result of the complex enthalpy change during decomposition, the onset temperature can only be approximated. As the test item was supplied as hydrate, it was considered that the broad endotherm observed from approximately 80°C was most likely due to losses of water of crystallisation. Test item is known to be hydroscopic, therefore it was considered that the endotherm observed from 25 to 80°C was most likely due to entrained water. As similar thermographic profiles were obtained using air and nitrogen atmospheres, observed decomposition is probably thermal and not oxidative.
Description of key information
Hexachloroiridic acid, Hydrogen hexachloroiridate (IV) decomposed from approximately 80°C with no definitive signs of melting below 450°C.
Key value for chemical safety assessment
Additional information
Melting point was determined in a GLP-compliant study using differential scanning calorimetry, using ASTM E537-86 and designed to be compatible with EU method A1 and OECD guideline 102 (Harlan 2011). This study is considered suitable for use as the key study for this endpoint. Hexachloroiridic acid, Hydrogen hexachloroiridate (IV) decomposed from approximately 80°C with no definitive signs of melting below 450°C.
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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