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Diss Factsheets
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EC number: 233-135-0 | CAS number: 10043-01-3
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
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Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- 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.
- Principles of method if other than guideline:
- unspecified
- GLP compliance:
- not specified
- Type of method:
- other: no data
- Remarks:
- handbook data
- Melting / freezing pt.:
- ca. 770 °C
- Decomposition:
- yes
- Executive summary:
A reference handbook provides a melting/decomposition temperature of ca 770°C for the anhydrous form of the substance.
- Endpoint:
- melting point/freezing point
- 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 for cross-reference:
- reference to other study
- Melting / freezing pt.:
- 770 °C
- Decomposition:
- yes
- Remarks on result:
- other: (ref.1) supposed anhydrous form
- Melting / freezing pt.:
- 250 °C
- Decomposition:
- yes
- Remarks on result:
- other: (ref.2) Melts when gradually heated; at 250 deg C loses its water
- Melting / freezing pt.:
- 770 °C
- Decomposition:
- yes
- Remarks on result:
- other: (ref.3)
- Melting / freezing pt.:
- 86.5 °C
- Decomposition:
- yes
- Remarks on result:
- other: (ref.4) Aluminum Sulphate Octadecahydrate
- Executive summary:
A reference database provides different melting point values, showing that the hydrated forms loose the crystallisation water, before the anhydrous form decomposes at 770°C.
- Endpoint:
- melting point/freezing point
- 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 for cross-reference:
- read-across source
- Executive summary:
From analogue, no melting (i.e. transition to liquid form) is expected up to 550°C for the 15 - 16 H2O hydrated form, but with decomposition corresponding to crystal water loss.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- 09 March 2010- 04 June 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. Test substance is adequately characterised. Therefore full validation applies.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- thermal analysis
- Remarks:
- Differential Scanning Calorimetry + ThermoGravimetric Analysis
- Remarks on result:
- other: Melting of the test substance was not observed (under nitrogen).
- Conclusions:
- Decomposition of test substance without melting up to 550°C.
- Executive summary:
The melting point of aluminium sulphate basic hydrated was investigated according to OECD/EC guidelines, thermal analysis method. A preliminary assay was conducted with TGA; four main measurements were performed with DSC (varying parameters) under nitrogen. No melting (i.e. transition to liquid form) was observed up to 550°C, but weight loss and endotherms were recorded, and attributed to decomposition corresponding to crystal water loss.
Referenceopen allclose all
Experiments were performed from 25°C (initial temperature) to 550°C (maximum end temperature). During the experiments, endothermic effects were observed between 75°C and 175°C and between 325°C en 375°C. After all experiments, a white residue remained in the sample container (original colour: white).
The amount of water calculated from the structural formula Al2(SO4)3x 14H2O is approximately 42%. During the preliminary test, a 45% weight loss was observed. The endothermic effects observed between 75°Cand 175°C during the main study were due to evaporation of part of the crystal water. The endothermic effect observed between 325°C en 375°C during the main study were probably due to evaporation of the remaining crystal water.
Description of key information
Aluminium sulphate (anhydrous) decomposes at 770°C (literature).
Hydrated forms undergo primary decomposition corresponding to crystal water loss from ca 80°C (from literature and experiment on analogue).
Key value for chemical safety assessment
Additional information
A reliable literature source is provided for the reference substance (anhydrous form), and is considered as key data. The same result was also found in numerous commonly used handbooks or databases, despite not peer reviewed. However the value of 770°C is associated with decomposition, and therefore will not be retained as key value for purpose of CSA (no solid-liquid transition).
A single, updated, reference handbook provides a non-consistent value, but as no details are available, the usual and lower value is retained.
Supporting information on the 18 H2O and on analogue in an experimental report show that the hydrated forms undergo primary decomposition corresponding to crystal water loss from ca 80°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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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