Ammonium aluminum sulfate

Ammonium aluminum sulfate (CAS 7784-25-0), commonly known as ammonium alum, is an inorganic double salt.

Where is Ammonium aluminum sulfate used?

• Water treatment: coagulant that destabilizes suspended particles and clarifies raw water
• Textile and leather: mordant to fix dyes onto fiber substrates and tanning agent that improves hide durability
• Pulp and paper: supports rosin sizing by precipitating the sizing agent onto cellulose fibers, improving water resistance in the finished sheet
• Effluent treatment: pH correction and suspended solids removal before discharge
• It also functions as a pH-buffering agent in industrial processing and purification.

Good to know: Anhydrous and dodecahydrate forms are both available; buyers specify the form based on handling and dissolution requirements.

Commercial specifications

• Technical grade for industrial processing
• Food-grade material meeting FCC specifications for permitted food-contact and processing applications