Buying caustic soda for industrial use is not just a matter of comparing prices. Inconsistent quality, unsuitable packaging or incomplete documents can cost your production line far more than any price difference. This guide covers the key points to check before placing an order.
1. Purity and technical specifications
The sodium hydroxide percentage is the main quality indicator, but not the only one. In the technical data sheet (TDS), also check:
- Sodium carbonate (Na₂CO₃) content, a sign of CO₂ absorption and ageing
- Sodium chloride (NaCl) content
- Iron (Fe) content, which matters greatly for textile, food and detergent applications
For liquid caustic, the exact concentration (for example 32% or 50%) must be stated in the contract and the certificate of analysis, since the price is based on the active substance.
2. A certificate of analysis for every shipment (COA)
A reliable supplier provides a certificate of analysis for every production batch. The COA should show the batch number, production date and actual test results, not just general catalogue figures. If possible, have a sample checked by an independent laboratory as well.
3. Packaging that fits your use
Flakes usually come in 25 kg bags or jumbo bags, and liquid caustic in tankers or IBC containers. Packaging must resist moisture and carry the hazard label, net weight, batch number and production date. For export, packaging and palletising must meet sea-freight and destination-country requirements.
4. Required documents
- TDS: technical data sheet
- MSDS: safety data sheet
- COA: certificate of analysis for each shipment
- Certificate of origin: for export orders and preferential tariffs
5. Supply reliability and delivery time
For a plant with continuous consumption, even a few days without supply is expensive. Check the seller’s production capacity or supply network, their on-time delivery record and whether long-term contracts are possible. Buying directly from the manufacturer usually brings more stable quality and prices.
6. Shipping and customs clearance
Caustic soda is a Class 8 dangerous good, and shipping it requires special vehicles and documents. If the supplier handles transport, insurance and customs clearance itself, the risk of delays and hidden costs drops noticeably.
Summary
Before buying, ask the seller for exact technical specifications, a COA for each shipment, suitable packaging, complete documents and proof of reliable supply. As a caustic soda manufacturer and chemical supplier, Petrozal provides all of these with every order. Submit a quote request to receive technical specifications and today’s price.
