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Physical & Chemical properties

Appearance / physical state / colour

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Endpoint:
appearance / physical state / colour
Type of information:
not specified
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
Data from a peer-reviewed handbook, accepted as a reliable data source according to Chapter R.7A of REACH Guidance on information requirements and chemical safety assessment, adequate for assessment. Restrictions apply as no experimental details and purity is not specified.
Qualifier:
no guideline required
Principles of method if other than guideline:
Not applicable.
Physical state at 20°C and 1013 hPa:
solid
Key result
Form:
solid: crystalline
Colour:
White
Odour:
odourless
Substance type:
inorganic
Conclusions:
Aluminium sulphate, anhydrous, is solid at ambient temperature.
Executive summary:

A reference handbook, also cited in a reference database, describes the anhydrous form of the substance as white, lustrous crystals, pieces, granules, or powder, with no odour.

Endpoint:
appearance / physical state / colour
Type of information:
not specified
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
Data from a secondary source, accepted as a reliable data source according to Chapter R.7A of REACH Guidance on information requirements and chemical safety assessment, adequate for assessment. Restrictions apply as no experimental details and purity is not specified.
Reason / purpose:
reference to other study
Qualifier:
no guideline required
Principles of method if other than guideline:
Not applicable.
Physical state at 20°C and 1013 hPa:
solid
Form:
solid: crystalline
Colour:
colourless
Substance type:
inorganic
Conclusions:
Aluminium sulphate, octadecahydrate, is solid at ambient temperature.
Executive summary:

A reference database provides description of the octadecahydrate form of the substance as a solid, colourless, monoclinic crystals.

Endpoint:
appearance / physical state / colour
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
09 March 2010 to 04 June 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Remarks:
Description of the substance is provided in an experimental report regarding physico-chemical properties. No guideline is required, and test substance is adequately characterised. Therefore full validation applies.
Qualifier:
no guideline required
Specific details on test material used for the study:
Expiry date 18 December 2010 (allocated by NOTOX, 1 year after receipt of the test substance)
Physical state at 20°C and 1013 hPa:
solid
Form:
solid: granular
Colour:
white
Substance type:
inorganic
Conclusions:
The test substance is solid at ambient temperature.
Executive summary:

An experimental report on physico-chemical properties is available, and describes aluminium sulphate hydrated basic as white granules.

Endpoint:
appearance / physical state / colour
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
supporting study
Justification for type of information:
The test substance is aluminium sulphate basic, of formula Al2 (OH)0.16 (SO4)2.92, and not pure aluminium sulphate Al2 (SO4)3; however, according to the notifier, limited basicity may occur in the technical substance. Therefore, the chemical similarity (only 0.8% OH) is considered sufficient for supporting data on the hydrated form, the reference substance for the REACh registration dossier being the anhydrous form.
Reason / purpose:
read-across source
Physical state at 20°C and 1013 hPa:
solid
Executive summary:

From analogue, the 15 -16 H2O hydrated form of the registered substance is expected to be a solid at ambient temperature and pressure.

Description of key information

Aluminium sulphate (anhydrous) is a white, odourless, solid.

Octadecahydrate and other hydrated forms are expected to be solid too (from literature and experiment on analogue).

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:
solid

Additional information

A reliable literature source is provided for the reference substance (anhydrous form), and is considered as key data.

Supporting information on the common hydrated forms 18 and 14 H2O is extrapolated from literature and from description of an analogue in an experimental report.