Solid caustic soda (flakes, prills, or granules) contains a much higher NaOH concentration than the aqueous solution typically traded domestically, which reduces the weight and volume of freight per unit of active chemical. This makes solid forms more economical for long ocean voyages, though they require moisture-proof packaging and careful handling to prevent hydration and heat generation during storage.

Antidumping and countervailing duty orders have been applied to caustic soda from specific countries at various times. Before finalizing a supply agreement, importers should consult a licensed customs broker to check whether current orders apply to the intended country of origin, as applicable duties can materially affect landed cost calculations.