Sodium metabisulfite price

Sodium Metabisulfite (SMBS) is typically available in Food Grade (97-98% purity) and Industrial Grade (96-97% purity). For food processing or wine making, ensure the product meets FCC (Food Chemicals Codex) or E223 standards to guarantee low heavy metal content (Lead < 2ppm, Arsenic < 1ppm). For industrial uses like water treatment or mining, focus on the active SO2 (Sulfur Dioxide) content, which should ideally be above 65% to ensure effective dechlorination or ore flotation.

Price is heavily influenced by particle size (crystalline vs. powder) and anti-caking additives. Crystalline forms are generally more expensive but offer better flowability and longer shelf life by resisting moisture absorption. Always request a Certificate of Analysis (COA) to verify the Iron (Fe) content; high-purity grades for the photographic or textile industries require Iron levels below 5-10ppm to prevent staining or chemical interference.

As a chemical product, the supplier must provide a Safety Data Sheet (SDS/MSDS) compliant with the GHS (Globally Harmonized System). For shipments to Europe, verify REACH registration. Since SMBS can release toxic sulfur dioxide gas when in contact with acids, ensure the packaging is moisture-proof and airtight, typically using 25kg or 1000kg PP/PE bags with inner liners.

In water treatment (Reverse Osmosis), consistency is key to prevent membrane damage, so sourcing from ISO 9001 certified manufacturers is critical. In mining (gold extraction), volume and logistics costs dominate the price, so bulk purchasing (FCL - Full Container Load) is the most economically feasible strategy. For food preservation, prioritize suppliers with HACCP or ISO 22000 certifications to meet global food safety audits.

The biggest risk is product degradation due to moisture. SMBS is highly hygroscopic; if the seal is breached, it reacts with oxygen and moisture to become Sodium Sulfate, losing its efficacy. Mitigate this by mandating palletization with shrink-wrap and requesting pre-shipment inspections (such as SGS or Intertek) to verify packaging integrity and chemical potency.

Leverage volume-based pricing tiers. Suppliers often offer a 5-10% discount for orders exceeding 20 tons (1x20GP container). Additionally, discuss long-term supply contracts to hedge against the volatility of raw material costs (Sulfur and Soda Ash). Always ask for FOB (Free On Board) pricing to compare shipping rates independently, as chemical freight rates can fluctuate significantly.

Sodium Metabisulfite is generally classified as Class 8 (Corrosive) or Class 9 (Environmentally Hazardous) depending on the concentration and local regulations (UN 2693 or UN 1759). Ensure the supplier has a Dangerous Goods (DG) License and provides the IMDG Code documentation for sea freight. Failure to declare chemicals correctly can lead to heavy fines and seizure at customs.

Use Secure Payment services provided by Made-in-China.com to ensure funds are only released upon proof of shipment. Conduct factory audits or use the 'Audit Finished' filter on the platform to identify verified gold-tier suppliers. This reduces the risk of 'trading companies' posing as manufacturers, ensuring more stable lead times and direct-from-factory pricing.