| Identification | More | [Name]
Aluminium sulfate octadecahydrate | [CAS]
7784-31-8 | [Synonyms]
ALUM
ALUMINIUM SULFATE-18-HYDRATE
ALUMINIUM SULFATE HEXADECAHYDRATE
Aluminium sulfate octadecahydrate
ALUMINIUM SULPHATE 16H2O
ALUMINIUM SULPHATE 18-HYDRATE
ALUMINIUM SULPHATE HYDRATED
ALUMINUM SULFATE
ALUMINUM SULFATE-18 H2O
ALUMINUM SULFATE, 18-HYDRATE
ALUMINUM SULFATE HEXADECAHYDRATE
ALUMINUM SULFATE, HYDRATED
ALUMINUM SULFATE OCTADECAHYDRATE
CAKE ALUM
PATENT ALUM
PICKLE ALUM
Aluminiumsulfate,octadecahyd
aluminiumsulfateocatadecahydrate
aluminiumsulphateocatadecahydrate
aluminumsulfate(non-specificname) | [EINECS(EC#)]
233-135-0 | [Molecular Formula]
Al2H36O30S3 | [MDL Number]
MFCD00149136 | [Molecular Weight]
666.43 | [MOL File]
7784-31-8.mol |
| Chemical Properties | Back Directory | [Appearance]
white crystalline powder and chunks | [Melting point ]
86 °C
| [density ]
1,69 g/cm3 | [storage temp. ]
Sealed in dry,Room Temperature | [solubility ]
364g/l | [form ]
Powder/Solid | [color ]
White | [Specific Gravity]
1.69 | [PH]
2.5-4.0 (20g/l, H2O, 20℃) | [PH Range]
3 - 4 | [Water Solubility ]
Soluble | [Sensitive ]
moisture sensitive | [Uses]
Alum is a preservative, the inclusive term for several inum-type compounds such as inum sulfate and inum potassium sulfate. It is used with edta to prevent discoloration of potatoes and to maintain the firmness of shrimp packs. It is also used in pickles and pickle relish. | [CAS DataBase Reference]
7784-31-8(CAS DataBase Reference) | [EPA Substance Registry System]
7784-31-8(EPA Substance) |
| Safety Data | Back Directory | [Hazard Codes ]
N-Xn,Xi | [Risk Statements ]
R51/53:Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment .
R41:Risk of serious damage to eyes.
R36/37/38:Irritating to eyes, respiratory system and skin .
R22:Harmful if swallowed. | [Safety Statements ]
S61:Avoid release to the environment. Refer to special instructions safety data sheet .
S37/39:Wear suitable gloves and eye/face protection .
S29:Do not empty into drains .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S39:Wear eye/face protection . | [RIDADR ]
UN3260 - class 8 - PG 3 - RQ - Corrosive solid, acidic, inorganic, n.o.s., HI: all | [WGK Germany ]
1 | [RTECS ]
WS5697000 | [HS Code ]
28332200 | [Toxicity]
LD50 orally in Rabbit: > 5000 mg/kg |
| Questions And Answer | Back Directory | [Uses]
The compound is used heavily in the paper industry. In its acidic solution form, which contains a slight excess of H2SO4, it is used for pH control of pulp slurries, treatment of process waters, setting of dyes and also for precipitating dissolved resin for setting the size on the fibers. In slight basic form (containing a slight excess of Al2O3), it is used for treatment of drinking and waste waters (e.g., for reducing phosphorus content). Other major applications include dyeing, tanning, catalysts, modification of concrete, and in the manufacture of various chemicals and pharmaceutical products.
| [Preparation]
Prepared from bauxite, kaolin or aluminum compounds on reaction with H2SO4. The insoluble silicic acid is filtered out; the hydrate salt forms on crystallization.
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| Hazard Information | Back Directory | [Chemical Properties]
white crystalline powder and chunks | [Physical properties]
White crystal; sweet taste; density 1.62 g/cm3: decomposes at 86.5°C; soluble in water. | [Definition]
ChEBI: A hydrate resulting from the the formal combination of anhydrous aluminium sulfate with approximately 18 mol eq. of water. The commercial product usually contains 5-10% less water than theory. It is one of the commonest hydrates of aluminium sulfate. |
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