Aluminium Sulphate
Alum, Filter Alum, Papermaker's Alum, Al2(SO4)3
- CAS
- 10043-01-3
- EC
- 233-135-0
- Sectors
- Water & Wastewater Treatment, Textiles, Leather & Paper
Aluminium Sulphate (CAS 10043-01-3) is an inorganic coagulant salt supplied in technical grade, a white powder or chunk material that dissolves readily and neutralizes suspended particles in water treatment, paper sizing as papermaker's alum, textile dyeing as a mordant, and leather tanning. It features high solubility and a superior ability to neutralize suspended particles for efficient sedimentation. Commonly known as paper alum, it is critical for internal sizing in the paper industry to enhance ink resistance. This chemical is valued for its pH regulating properties and its role as a mordant in textile manufacturing. It ensures high-purity results in clarification processes across diverse industrial sectors.
Typical Properties
| Molecular formula | Al.3/2H2O4S |
|---|---|
| Molecular weight | 342.15 g/mol |
| Appearance | White powder |
| Form | Powder and/or Chunks |
| Color | White |
| Odor | at 100.00?%. odorless |
| Melting point | 770 °C (decomp) |
| Density | 1.61 g/cm³ |
| Water solubility | soluble |
| GHS signal word | Warning · Corrosive, Irritant / harmful |
| HS code | 28332200 |
| Grades available | Technical Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Aluminium Sulphate
Applications
• Water Clarification: Used as a primary flocculant to remove turbidity and organic matter from municipal water.
• Paper Sizing: Applied in the papermaking process to improve water resistance and surface strength of the sheet.
• Textile Mordant: Enhances the binding of dyes to fibers, ensuring color fastness and vibrancy in fabrics.
Safety & Risks
Classified as Irritant. Exposure can cause severe eye irritation and skin redness. Operators should wear protective goggles, nitrile gloves, and long-sleeve workwear.
Packaging
25kg PP/PE bags, 1000kg Big Bags, and bulk liquid tankers.