Anhydrous Caustic Soda is produced by multi-stage evaporation process and transformed into the solid state either as micro spherical particles called Prills (Pearl) or as Caustic Soda Solid (Fused).

Anhydrous Caustic Soda is produced by SODA in two forms:

  • Prills (Caustic Soda Prills)

  • Solid (Caustic Soda Solid [Fused])


  • Highly hygroscopic and deliquescent (soluble in moisture absorbed from atmosphere).

  • Reacts with carbon dioxide present in the air to form sodium carbonate.

  • Attract metals such as lead, zinc, aluminum, magnesium and other alloys, resulting in evolution of hydrogen.

  • Odourless, non-combustible and has no explosive limit.

Caustic Soda in the form of Prills offers    distinct advantages over flakes, as enumerated below:

  • Uniform and optimum size of prills facilitate good blending characteristics in dry mix formulation and posses excellent free-flow properties.

  • Prills are hard and crush resistant as they do not easily break down into irritant dust. Low irritant dust means low moisture absorption, greatly reduces the risk of caking.

  • Prills dissolve faster needing only a shorter period of agitation.

  • Prills being denser than flakes, occupy less space for the same weight of Caustic. This permits optimum utilization of storage facilities and minimal transport cost.