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Aluminum sulfate

CAS Number
10043-01-3
EC Number
233-135-0
Chemical Formula
Al.3/2H2O4S
Molecular Weight
342.2 g/mol

Description

Aluminum sulfate (CAS 10043-01-3 ), commonly known as alum, is an inorganic salt used across municipal and industrial sectors primarily as a coagulant and flocculant. It destabilizes suspended particles in water and process streams, enabling their removal through settling or filtration. In water and wastewater treatment, this chemical is dosed into raw water to aggregate colloidal solids, turbidity, and organic matter ahead of clarification stages. This process is essential for ensuring high-quality output in municipal systems. Pulp and paper manufacturers apply it to size paper with rosin, improving water resistance and controlling fiber retention on the wire. This application remains a cornerstone of the industrial manufacturing process for various paper grades. In textile and leather processing, it acts as a mordant and tanning auxiliary, fixing dyes and preparing hides for further treatment. These properties make it indispensable for achieving consistent color and texture in finished goods. Building and construction applications include use as a set accelerator in concrete and cement formulations, reducing cure time under controlled conditions. This allows for faster project completion and improved structural integrity in specific environments. The product is supplied as granules, powder, and liquid solution, with the anhydrous and hydrated forms both commercially available. Standard grades include technical, water treatment, and paper-grade specifications to meet diverse needs. Purity and iron content are tightly controlled depending on the end use to ensure compliance with industrial requirements. Bulk supply in dry or liquid form is standard for high-volume water treatment and industrial buyers globally. Contact us for supply of Aluminum sulfate Request Quote

Other Names (Synonyms)

sulfuric acid, aluminum salt (3:2) | sulfuric acid, aluminium salt (3:2) | sulfatodialuminum disulfate | sulfatodialuminium disulfate | papermaker's alum | dialuminum trisulfate | dialuminum sulfate | dialuminium trisulfate

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

Physical Properties

Melting Point770 °C (decomp)
Boiling Point759.71°C (estimate)
Density1.61 g/cm³
AppearanceWhite powder
ColorWhite
Odorat 100.00?%. odorless
FormPowder and/or Chunks
Water Solubilitysoluble
Vapor Pressure0-0.001Pa at 20-25℃
Log P-5.08--0.12 at 20℃

Safety & Handling

Danger
GHS05· CorrosiveGHS07· Irritant

Hazard Statements

H290May be corrosive to metals
H318Causes serious eye damage
H319Causes serious eye irritation

Precautionary Statements

P234Keep only in original packaging.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P317Get emergency medical help.
P390Absorb spillage to prevent material damage.
P406Store in a corrosion-resistant/… container with a resistant inner liner.
P265Wash … thoroughly after handling.
P317If eye irritation persists: Get medical advice/attention. Get emergency medical help.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code28332200
UN Number1760
Storage Class8B - Non-combustible corrosive hazardous materials
WGK (Germany)1