Industrial salts and alkalis
Caustic Soda 99% NaOH Flakes & Pearls — Bulk Supply
Request caustic soda bulk price quote — flakes and pearls from 24 MT, FOB/CFR/CIF
Key parameters — Caustic Soda 99% NaOH
Full specification — Caustic Soda 99% NaOH
| NaOH (sodium hydroxide) | 99% min |
| Sodium carbonate (Na2CO3) | 0.5% max |
| Chlorides (NaCl) | 0.05% max |
| Iron (Fe2O3) | 15 ppm max |
| Sulphates (SO4) | 0.005% max |
| Silica (SiO2) | 10 ppm max |
| Appearance | White opaque flakes or uniform pearls |
| NaOH (liquid, on request) | 50% min solution |
| UN number | 1823 (solid); 1824 (solution) |
| HS code | 2815.11 (solid) |
Product overview — Caustic Soda 99% NaOH
Alumina refineries, kraft pulp mills and soap manufacturers request caustic soda bulk price quotes when buying 99% NaOH flakes or pearls for Bayer digestion, bleaching sequences and saponification lines. We supply solid caustic with iron capped at 15 ppm and chlorides at 0.05% — the low-metal specification alumina and pulp circuits require on mill COA-backed contracts from 24 MT MOQ.
White flake grade dissolves rapidly in open dissolving tanks and suits pulp mills, municipal water-treatment plants and textile mercerizing operations running batch caustic make-down. Pearl grade has lower surface area, generates less dust during pneumatic transfer and is preferred by alumina refineries, detergent compounders and biodiesel plants feeding automated dissolution systems with controlled feed rates.
Typical buyers include Bayer-process alumina refineries in India and the Middle East securing merchant caustic when captive chlor-alkali units run at reduced rates, kraft pulp mills on annual caustic supply contracts, oleochemical and soap manufacturers, petroleum refineries for crude desalting and neutralization, and chemical distributors supplying MENA industrial parks. HS code 2815.11. MOQ from 24 MT on FOB, CFR or CIF terms.
Full product details
Loading ports & logistics — Caustic Soda 99% NaOH
Solid caustic soda is strongly hygroscopic and corrosive — moisture control and compatible handling equipment are mandatory at every transfer point. Contract MOQ is 24 MT — fulfilled by 25 kg PE-lined PP woven bags palletised into 20-foot containers (~24 MT net per unit). Standard carbon steel and aluminium fittings cannot receive this cargo without rapid corrosion failure.
25 kg PE-lined PP woven bags palletised into 20-foot containers hold approximately 24 MT net per unit and suit multi-modal routes to inland alumina refineries, pulp mills and detergent plants with covered warehouse discharge. Ideal for parcels of 24–500 MT assembled from multiple container units on FOB Black Sea or MENA origins.
1,000 kg UN-certified FIBC bulk bags with moisture-barrier liners move parcels of 100–3,000 MT on short-sea coaster routes to South Asian and Mediterranean ports with bulk-bag unloading equipment. Lower bag count per tonne reduces stevedoring cost versus 25 kg units on larger parcels.
For continuous-process buyers requiring liquid alkali, see caustic soda liquor 32–50% — shipped in nickel-lined ISO tanks from 100 MT MOQ, not in bagged solid form.
Packaging & documentation — Caustic Soda 99% NaOH
Solid NaOH ships in 25 kg PE-lined PP woven bags (palletised and stretch-wrapped) or 1,000 kg UN-certified FIBC with moisture-barrier liner. Liquid grade ships in dedicated stainless ISO tanks with heating capability for cold-climate discharge. Each lot is accompanied by a mill certificate of analysis showing NaOH assay, carbonate, chloride and iron results, safety data sheet (SDS) per GHS with corrosive hazard classification, commercial invoice, packing list, bill of lading and certificate of origin.
NaOH content is confirmed by acidimetric titration against hydrochloric acid standard on the COA. Third-party inspection (SGS, Bureau Veritas or equivalent) at loading can be arranged on buyer request. Bag integrity and moisture-barrier seal checks are mandatory before container stuffing; we issue stowage and segregation documentation with the shipping instructions package. IMDG dangerous goods declaration and emergency response guide references are included for Class 8 corrosive carriage.
FAQ — Caustic Soda 99% NaOH
When should buyers order caustic soda flakes versus pearls?
Flakes dissolve faster in open dissolving tanks and suit pulp mills and water-treatment plants running batch caustic make-down. Pearls have lower surface area, resist dusting during pneumatic transfer and are preferred by alumina refineries and detergent compounders feeding automated dissolution systems.
How is solid caustic soda shipped on export routes?
Solid NaOH moves in 25 kg PE-lined bags palletised into 20-foot containers (24 MT per unit) or 1,000 kg UN-certified FIBC bulk bags on coaster vessels. Liquid 50% caustic is available on request in dedicated stainless ISO tanks. IMDG Class 8 corrosive documentation is mandatory on every consignment.
Related products — Caustic Soda 99% NaOH
- Soda Ash Light — lower bulk-density sodium carbonate for detergents and water softening
- Soda Ash Dense — high-density grade preferred for glass furnace silo feed
- Potassium Hydroxide — caustic potash alkali for chloride-free fertilizer salts
- Hydrochloric Acid — co-product from chlor-alkali electrolysis circuits
