Aluminum potassium sulfate dodecahydrate

Aluminum potassium sulfate dodecahydrate (CAS 7784-24-9), commonly known as potassium alum or E522, is the fully hydrated crystalline form of alum used across water treatment, food processing, and industrial manufacturing.

It functions primarily as a coagulant, flocculant, and pH buffer, enabling solid-liquid separation and surface fixation across multiple process industries. In municipal and industrial water treatment, it acts as a coagulant to aggregate suspended particles.

This chemical is essential for clarifying drinking water and managing wastewater. Food processors use it as a firming agent and leavening component in baked goods, pickles, and starch-based products to maintain texture and quality.

Leather tanning and textile dyeing operations rely on it to fix dyes and mordant fibers, improving color retention and surface adhesion. In paper manufacturing, it controls sizing by precipitating rosin onto cellulose fibers.

This process directly affects paper strength and ink absorption in commercial printing. The product is supplied as white crystalline powder or granules, with crystal lump forms available for specific industrial applications.

Recognized grades include food-grade (FCC, E522-compliant) and technical grade for industrial use. Pharmaceutical and cosmetic supply is available under BP and USP specifications where purity requirements are more stringent.