ALUMINUM SULFATE

IUPAC Name: Aluminum; sulfuric acid; octahydrate 
Following is the structure of Aluminium sulphate (CAS NO.16828-11-8):
               
Empirical Formula: H22Al2O20S3
Molecular Weight: 492.3208 
Enthalpy of Vaporization: 62.94 kJ/mol
Boiling Point: 330 °C at 760 mmHg
Vapour Pressure: 3.35E-05 mmHg at 25 °C 
Melting point: 770 °C (dec.)(lit.)
Storage temp. of Aluminium sulphate (CAS NO.16828-11-8): 0-6 °C
Density of Aluminium sulphate (CAS NO.16828-11-8): 2.71 g/mL at 25 °C(lit.)
Canonical SMILES: O.O.O.O.O.O.O.O.OS(=O)(=O)O.OS(=O)(=O)O.OS(=O)(=O)O.[Al].[Al]
InChI: InChI=1S/2Al.3H2O4S.8H2O/c;;3*1-5(2,3)4;;;;;;;;/h;;3*(H2,1,2,3,4);8*1H2
InChIKey: JANHUGNIVASISO-UHFFFAOYSA-N

 Aluminium sulphate (CAS NO.16828-11-8) is mainly used in papermaking, water purification, and also used as mordant, leather tanning, pharmaceutical astringent, wood preservatives, foam fire extinguishing agent.

 Aluminium sulphate (CAS NO.16828-11-8) hasn't been listed as a carcinogen by ACGIH, IARC, NTP, or CA Prop 65. And the toxicological properties have not been fully investigated. You can see actual entry in RTECS for complete information.

Hazard Codes: Xi
Risk Statements: 37/38-41 
R37/38:Irritating to respiratory system and skin. 
R41:Risk of serious damage to the eyes.
Safety Statements: 26-39 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S39:Wear eye / face protection.
WGK Germany: 1
RTECS: BD1700000

 Aluminium sulphate , its cas register number is 16828-11-8. It also can be called Aluminum sulfate hexadecahydrate ; and Aluminum sulfate hexahydrate . Aluminium sulphate (CAS NO.16828-11-8) could be stable under normal temperatures and pressures. But it absorbs moisture or water from the air. It should avoid the condition like incompatible materials, exposure to moist air or water. It is not compatible with strong oxidizing agents. And also prevent it to broken down into hazardous decomposition products: carbon monoxide, oxides of sulfur, carbon dioxide, aluminum oxide. However, its hazardous polymerization will not occur.