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Sodium Hydroxide

Description: Deflocculant

Oxide Analysis Formula
Na2O 77.50% 1.00
LOI 22.50%n/a
Oxide Weight 62.00
Formula Weight 80.00


Also called caustic soda.
This is a powerful deflocculant in clay slurries and casting slips and behaves in a manner silimar to soda ash. However, it is corrosive and thus seldom used commercially.

Some people also use this for its chemistry to source Na2O to the glaze (it does not form crystals like soda ash). During the firing NaOH picks up oxygen and becomes Na2O.H2O. Thus we can deem Na2O.H2O as entering the kiln (weighing 80) and exiting as Na2O (weighing 62).

Related Information


Typecodes Additives for Ceramic Glazes
Materials that are added to glazes to impart physical working properties and usually burn away during firing. In industry all glazes, inks and engobes have additives, they are considered essential to control of cohesion, adhesion, suspension, dry hardness, surface leveling, rheology, speed-of-drying, etc. Among potters, it is common for glazes to have zero additives.
Materials Sodium Carbonate
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