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Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
28 May 2010- 5 August 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
This study has been performed according to OECD and EC guidelines and according to GLP principles. The test substance is adequately characterised. Therefore full validation applies.
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Remarks:
+ ThermoGravimetric Analysis (TGA)
Remarks on result:
other: No melting and/or boiling point below 400°C (673 K) could be determined using DSC.

Results

Preliminary test

The TGA-curve of the test substance shows that from 75°C upwards the weight of the sample decreased significantly. At 281°C the sample weight had decreased by 25%.

 

After the experiment, a black reddish residue remained on the outside of the sample container (original colour: white). The change of the colour indicated reaction and/or decomposition of the test substance.

 

Main study

The DSC-curve obtained with the first experiment shows that several small endothermic effects were observed. It was assumed that elimination of the water from the molecular structure of the test substance was predominantly responsible for these endothermic effects. No endothermic effects which could be attributed to either melting and/or boiling of the test substance were observed.

 

After the experiment, a white residue remained in the sample container.

Conclusions:
Decomposition of test substance, without boiling up to 400°C (673 K).
Executive summary:

The boiling point of dialuminium chloride pentahydroxide was investigated according to OECD/EC guidelines, thermal analysis method. A preliminary assay was conducted with TGA; one main measurement was performed with DSC under nitrogen. No boiling was observed up to 400°C, but weight loss and endotherms were recorded, and attributed to decomposition corresponding to crystal water loss.

Description of key information

Decomposes without boiling up to 400°C.

Key value for chemical safety assessment

Additional information

A fully reliable experimental study, conducted according to a recognized OECD/EC method and under GLP, is available. Therefore, it is considered as a key study. Crystal water loss was observed from ca 75°C, but no boiling occured up to 400°C. Therefore, the result is expressed as a limit value, and cannot be retained as key data for purpose of CSA.

It should be noted that the endpoint could have been waived: in accordance with column 2 of REACH Annex VII, the boiling point study does not need to be conducted as the substance has a melting point above 300°C (please refer to section 4.2).