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Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

The information on the physical and chemical properties were from experimental results with test sample provided by Lead Registrant, or either cited from peer-reviewed database or handbooks, or publications. These studies followed standard guidelines for methodology and so the data is considered reliable and suitable for use. Expert judgement-based waiving are applied for the endpoints on which tests are not necessary.


Aluminium chloride hydroxide sulphate, always manufactured as aqueous solution for stability of composition purpose, is a dense, clear colourless liquid, with low freezing point. Negligible vapour pressure is anticipated for the pure substance. Other PC properties are mostly driven by the solvent. It is fully miscible in water, without surface-active properties, and undergoes complex pH-dependent speciation.

It is not classified for physical hazards, based on CLP criteria, except that solutions are corrosive to metals.

Additional information

Summary of relevant physico-chemical properties:


Aluminium chloride hydroxide sulphate (typical aqueous solution)

 Appearance  Clear colourless liquid
 Freezing/melting point  Freezing range between -35 and -45°C, melting at ca -26°C.
 Boiling range  ca 105°C (evaporation of water)
 Relative density  1.20
Water solubility  Aqueous solution as manufactured is totally miscible; however aluminium speciation rapidly leads to salting out to various degrees which are water quality-, and expecially highly pH-dependent. Solubility of monomeric Al can descend as low as 12 µg Al/L.
 Surface tension  74.5 mN/m at 1 g/L (of solution)
 Flammability No FP observed up to boiling ca 104°C.

No Auto-Ignition Temperature observed up to 650°C.

No pyrophoric properties expected, or release of flammable gas if contact with water (based on experience).

Self-heating unlikely for liquids (method not applicable).

 Explosive / Self-Reactive properties  No explosive or self-reactive properties anticipated (based on chemical structure).
 Oxidising properties  No oxidising properties anticipated (based on chemical structure). Not a peroxide.
 Dissociation constant  Not required (forms various hydroxides and polymeric species, depending on pH).
 Metal corrosivity

 100% mass loss on aluminium within 2 days (from analogue 1).

Solution is corrosive to aluminum./May corrode metals in presence of moisture. (from analogue 2)

Numerical values above are given for a typical 16%w/w solution, containing 4.4% Al, having the formula Al (SO4)0.09 (OH)2.03 Cl0.79.

As an UVCB, it should be noted that the above parameters may show some variations.

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