Sodium metabisulfite price

The price is primarily driven by purity levels (typically 96.5% to 98%+) and the specific grade. Food Grade requires stricter adherence to heavy metal limits (e.g., Lead < 2ppm, Arsenic < 1ppm), while Industrial Grade focuses on the SO2 (Sulfur Dioxide) content, which should ideally be ≥ 65%. For photo or pharmaceutical grades, even higher purity and lower water-insoluble matter are required, commanding a premium price.

In water treatment, SMBS is used as a dechlorination agent; here, solubility and consistency are vital to prevent clogging dosing pumps. In the mining industry (gold cyanidation), large volumes are required, making bulk packaging (1000kg jumbo bags) and logistics efficiency the primary cost-saving factors. For food preservation, compliance with FCC (Food Chemicals Codex) or E223 standards is non-negotiable to ensure consumer safety.

Buyers must ensure the supplier provides a valid COA (Certificate of Analysis) for every batch. For international trade, look for ISO 9001 for quality management and HACCP/ISO 22000 if purchasing food grade. Additionally, because it is a chemical product, a current MSDS (Material Safety Data Sheet) is mandatory for safe handling and customs clearance.

The price is highly sensitive to the cost of raw materials, specifically Sulfur and Soda Ash. Furthermore, energy costs in the manufacturing region significantly impact the final quote. Buyers should monitor these commodity trends and consider long-term contracts or strategic stockpiling when raw material prices are low to hedge against volatility.

Sodium Metabisulfite is sensitive to moisture and heat, which can cause it to decompose and release toxic sulfur dioxide gas. Ensure the supplier uses moisture-proof PE-lined bags. During sea freight, request containers be placed away from heat sources and ensure the cargo is kept dry and well-ventilated to prevent caking and loss of potency.

Utilize secure payment methods and consider third-party pre-shipment inspections (such as SGS or Intertek) to verify the SO2 content and purity before the balance is paid. When sourcing via Made-in-China.com, prioritize Audited Suppliers who have undergone rigorous on-site verification of their manufacturing capabilities and legal status.

Negotiate based on volume tiers; increasing an order from a 20ft container to multiple units can often reduce the price by 5-8%. Also, discuss Incoterms clearly—while FOB gives you control over freight, CIF might be more economical if the supplier has high-volume contracts with shipping lines. Always ask for a sample (500g-1kg) to be tested in your own lab before committing to a bulk purchase.

SMBS is classified under HS Code 283210. While not always classified as a dangerous good for all concentrations, it is an irritant. Check for anti-dumping duties that may apply between the exporting country and your specific region. Ensure all labeling complies with the GHS (Globally Harmonized System) for chemical classification and labeling to avoid customs delays.