Lignosulfonate is used in some ceramic body formulations as a binder and deflocculant aid, helping to improve the green (unfired) strength of ceramic bodies while supporting workable slip or paste flow during forming.
How lignosulfonate functions in ceramic formulations
- Green strength: Lignosulfonate can act as a binder that helps hold ceramic particles together before firing, improving the handling strength of the unfired (“green”) body.
- Deflocculation support: In slip casting formulations, lignosulfonate can work alongside other deflocculants (such as sodium silicate) to help manage slurry flow and viscosity.
- Formulation flexibility: Lignosulfonate is sometimes used as an alternative or complement to other binder and deflocculant chemistries (such as sodium tripolyphosphate or sodium carboxymethyl cellulose) in ceramic body formulations.
The effect of lignosulfonate on green strength, slurry flow, and overall formulation cost depends heavily on the specific ceramic body composition, the lignosulfonate grade and dosage, and the other additives present in the formulation. Reported performance data from trials run with one formulation and dosage range does not necessarily transfer to a different ceramic body, clay source, or production process.
Because ceramic body formulation is highly specific to the raw materials and process used, any trial of lignosulfonate as a binder or deflocculant aid should be run directly with the target formulation and firing process, starting from a supplier’s recommended trial dosage and comparing against the current control formulation, rather than assuming results reported for a different body composition.
