Ammonium aluminum sulfate

Ammonium aluminum sulfate (CAS 7784-25-0), commonly known as ammonium alum, is an inorganic double salt used across water treatment, textile, leather, and paper manufacturing.

It functions primarily as a coagulant, flocculant, and pH-buffering agent in both industrial processing and purification applications. In municipal and industrial water treatment, it acts as a coagulant.

The compound works to destabilize suspended particles and clarify raw water at scale. Textile and leather processors use it as a mordant to fix dyes onto fiber substrates and as a tanning agent.

This chemical improves hide durability during the tanning process. In pulp and paper production, it supports rosin sizing by precipitating the sizing agent onto cellulose fibers for better results.

This process improves water resistance in the finished sheet. It also serves effluent treatment operations where pH correction and suspended solids removal are required before discharge.

Ammonium aluminum sulfate is supplied as a white crystalline powder or granules. Standard commercial grades include technical grade for industrial processing and food-grade material meeting FCC specifications.

These specifications are for permitted food-contact and processing applications. Anhydrous and dodecahydrate forms are both available, with buyers specifying the form based on handling preferences.

The choice between forms often depends on specific dissolution requirements. This versatile chemical remains a staple for industrial manufacturers requiring reliable flocculation and pH control.