Sodium aluminum sulfate

Sodium aluminum sulfate (CAS 10102-71-3), also known as sodium alum and listed as E521 in food applications, is a double salt used in food processing and water treatment.

Where is Sodium aluminum sulfate used?

• Food production: leavening acid in baking powders and self-rising flours
• Baked goods: controls gas release timing for consistent texture
• Water treatment: coagulant and flocculant that aggregates suspended solids and clarifies drinking water
• Industrial effluent streams: coagulation and flocculation
• Textile and leather processing: mordant and fixing agent that improves dye uptake and bonding to fiber substrates
• Pulp and paper: pH control and sizing retention, influencing surface quality and ink absorption
• It also functions as an acidulant, coagulant, and pH buffer depending on the application context.

Commercial specifications

• Food-grade material to E521 specifications and FCC standards, suitable for direct food contact