Caustic soda flakes vs pearls vs liquid: which should you buy?
Flakes, pearls and liquid caustic soda are the same chemical — NaOH, CAS 1310-73-2 — in three physical forms. Choosing between them is a logistics and handling decision, not a chemistry decision. Here is the honest comparison we give buyers who ask.
The three forms
- Flakes — molten caustic solidified on a cooled drum and broken into thin flakes, typically 98–99% NaOH. The standard form in international trade.
- Pearls (prills, beads) — sprayed and cooled into uniform spheres of about 0.5–2 mm, usually 99% min. Free-flowing and low-dust.
- Liquid (lye, 48–50%) — caustic solution in water. Ready to dose, but roughly half of what you ship and store is water.
Side by side
| Flakes | Pearls | Liquid 50% | |
|---|---|---|---|
| Typical assay | 98–99% | ≥ 99% | 48–50% |
| Dust | Low | Very low | None |
| Dissolving | Fast, needs agitation | Fast and uniform | Already dissolved |
| Storage | Dry warehouse, bags | Dry warehouse, bags; flows in hoppers | Heated tanks; crystallises below ~12 °C |
| Freight per tonne of NaOH | Efficient | Efficient | Double — you freight the water too |
| Best fit | Importers, distributors, most industrial users | Plants with automated or closed dosing | Large local users with tank farms |
How to decide
- Importing or distributing? Take flakes — the best combination of assay, shelf life and freight economy, and the form your downstream buyers will recognise.
- Dosing automatically? Pearls flow like sand and do not bridge in hoppers; flakes can interlock. If your plant was designed for pearls, stay with pearls.
- Using thousands of tonnes near a producer? Liquid can win on handling — but only if you have heated, lined tankage and short freight. Across an ocean, solid almost always wins.
- Winter routes through cold climates? Remember liquid 50% starts to crystallise around 12 °C; flakes do not care about the cold, only about moisture.
Our plant specialises in flakes, in 25 kg bags and 1 MT jumbo bags — see the specification and current test data. If your process needs pearls or liquid, tell us in your enquiry and we will confirm what can be arranged before you commit.
Request a quotation
Send us your required grade, quantity and destination port. We reply with an indicative price, packing options and a specification sheet — normally within one working day.