← Critical Product/Equipment/Process: Chemicals, Pharma & Process (all topics)
Caustic soda / soda ash
What it is
Both are alkalis but made differently and used differently. Caustic soda comes from brine electrolysis and serves alumina, textiles, paper and soaps; soda ash is made by the Solvay process or from natural trona and goes mainly into glass, detergents and now lithium carbonate processing
They are partial substitutes in some applications
Impact on industries
- Soda ash demand is pulled by solar glass and lithium processing, both structurally growing, which differentiates it from caustic's mature end-markets
- Both face Chinese overcapacity and import pressure, and anti-dumping duties have been sought repeatedly on soda ash
- Soda ash is energy-intensive and, unlike caustic, has no valuable co-product to offset cost
- Substitution between them at the margin means each is capped by the other's price in overlapping applications