Caustic Soda Flakes vs Pearls: How to Choose 99% NaOH

Quick Answer

Caustic Soda Flakes and Caustic Soda Pearls are both 99% Sodium Hydroxide (NaOH) with the same CAS number (1310-73-2) and the same chemical performance in solution. The only real difference is particle shape and how each form behaves in your feeding and dissolving equipment.

• Choose Flakes if you dose manually or in small batches (roughly under 50 kg per addition), or your plant already runs flake-handling equipment.
• Choose Pearls if you use automated/gravimetric feeding systems, because their more uniform, rounded shape typically flows more consistently through hoppers and screw feeders and generates less dust during transfer.
• If neither applies, flakes are usually the lower-cost, more widely available option , while pearls carry a modest price premium for the added processing step.