Caustic soda (sodium hydroxide) sourcing guide
Caustic soda is offered as flakes (98–99%), pearls and liquid (32–50%). It is the base alkali of the chemical, aluminium, paper, textile and detergent industries; being corrosive, packaging integrity, moisture protection and ADR/IMDG-compliant transport matter.
Updated October 11, 2026
Quick facts
- HS code
- 2815.11 / 2815.12
- CAS number
- 1310-73-2
- Chemical formula
- NaOH
- Common grades
- Flakes 98–99%, pearls, liquid 32–50%
- Packaging
- 25 kg bags, big bags, ISO tank
Overview
Caustic soda is offered as flakes (98–99%), pearls and liquid (32–50%). It is the base alkali of the chemical, aluminium, paper, textile and detergent industries; being corrosive, packaging integrity, moisture protection and ADR/IMDG-compliant transport matter.
Typical applications
- Alumina production
- soap and detergents
- pulp and paper
- textile mercerising
- water treatment
- petroleum refining
- food processing
Specifications to agree with your supplier
When buying Caustic soda, agree in writing on the grade, applicable standard, packaging, delivery term (Incoterm) and acceptance criteria. Ask for a certificate of analysis (COA) for every lot, the technical data sheet (TDS) and, where relevant, the safety data sheet (SDS).
How to source reliably
Work with verified (KYC) suppliers, request samples and a trial lot before large volumes, use independent inspection (SGS, Bureau Veritas, etc.) and tie payment terms to shipping milestones. The platform deal room keeps offer history, the digital contract and delivery steps on record in one place.
Transport, storage & customs
Customs usually classify Caustic soda under HS heading 2815.11 / 2815.12; always confirm the exact code in your importing country’s tariff. Store the goods dry, protected from moisture and direct sunlight with packaging intact, and ask for loading photos and the bill of lading (B/L) before shipment.
Frequently asked questions
What is the HS code for Caustic soda?
It is usually classified under heading 2815.11 / 2815.12. The sub-heading depends on form and purity — confirm it in your importing country’s customs tariff.
How do I find a reliable Caustic soda supplier?
Prefer suppliers with the verified badge, a high trust score and completed deals. For large volumes, post a buying request to compare several offers and sign the contract in the deal room.
Can I buy small quantities as well?
Yes. For samples and small quantities you can message suppliers directly from the directory, free and commission-free. The deal room is designed for large, protected deals.