Classification
Product TypeIngredient
Product FormPowder (typically anhydrous; also traded as hydrate)
Industry PositionFood Additive / Food Ingredient
Market
Sodium sulfite (disodium sulfite) is an inorganic sulfite salt used internationally as an antioxidant and preservative in food applications (Codex/WHO INS 221), while also being widely traded for industrial uses (e.g., pulp & paper and water treatment). Global cross-border trade is commonly captured under HS 283210 (“sodium sulphites”), a category that can include both food-grade and technical-grade material. Recent UN Comtrade-based trade tables show export supply led by China, with additional major exporting capacity in Europe and Asia (e.g., Italy, Thailand, Turkey, India). Market access and downstream demand are strongly influenced by sulfite-related food safety rules and labeling/traceability expectations because sulfites can trigger adverse reactions in sensitive individuals at relevant concentrations.
Major Producing Countries- 중국Large global manufacturing base for inorganic chemicals; also the top exporter of HS 283210 in recent UN Comtrade-based trade tables.
- 이탈리아Significant exporter within HS 283210 trade tables, indicating meaningful production and/or regional re-export capacity.
- 태국Notable exporter in HS 283210 trade tables, consistent with established chemical manufacturing and export logistics in the region.
- 터키Major exporter in HS 283210 trade tables, reflecting industrial chemical production and proximity to EU/EMEA markets.
- 인도Active exporter in HS 283210 trade tables; production supported by domestic chemical and soda ash supply chains.
- 미국Producer and exporter at smaller scale in HS 283210 trade tables; also a major import market.
Major Exporting Countries- 중국Top exporter of HS 283210 (“sodium sulphites”) in recent UN Comtrade-based trade tables.
- 이탈리아Major exporter of HS 283210 in recent UN Comtrade-based trade tables.
- 태국Major exporter of HS 283210 in recent UN Comtrade-based trade tables.
- 터키Major exporter of HS 283210 in recent UN Comtrade-based trade tables.
- 인도Significant exporter of HS 283210 in recent UN Comtrade-based trade tables.
- 미국Exporter within HS 283210 trade tables; often serves regional markets.
Major Importing Countries- 콩고 민주 공화국Appears as a top importer in HS 283210 trade tables; likely reflects substantial industrial demand (HS 283210 covers sodium sulphites broadly, not only food-grade).
- 미국Major import market in HS 283210 trade tables; food and industrial uses operate under strict labeling/safety expectations for sulfites where applicable.
- 브라질Significant importer in HS 283210 trade tables.
- 남아프리카Significant importer in HS 283210 trade tables; regional hub dynamics can influence demand.
- 필리핀Notable importer in HS 283210 trade tables.
Specification
Physical Attributes- White, odorless crystalline powder (commonly traded as anhydrous; also transported as a heptahydrate).
- Reducing agent; can oxidize during storage/handling (quality managed via packaging and moisture control).
Compositional Metrics- Identity anchored by CAS 7757-83-7 and formula Na2SO3; commonly referenced in chemical and food-additive databases.
- Food-additive identity/classification referenced as INS 221 (sodium sulfite / disodium sulfite) in Codex/WHO systems.
- Buyer specifications commonly address assay/purity, moisture, insoluble matter, and trace impurities (limits set by applicable food-additive specifications or pharmacopeial/food-ingredient standards).
Grades- Food additive grade aligned to FAO/WHO (JECFA) specifications for sodium sulfite (INS 221).
- Food ingredient trade frequently references Food Chemicals Codex (FCC) as a food-grade quality benchmark (monograph-dependent).
- Technical/industrial grades traded for non-food applications (note: HS 283210 trade flows can include these grades).
Packaging- Typically shipped in moisture-protective bags (often 25 kg) and/or bulk formats for industrial users.
- Packaging and storage focus on keeping material dry to reduce oxidation and caking risk.
ProcessingReadily dissolves for use as a reducing/antioxidant agent in aqueous systems; handling controls focus on dust, moisture, and compatibility with oxidizers.
Supply Chain
Value Chain- Sulfur dioxide source → absorption/reaction in sodium-alkali solution → crystallization/solid separation → drying → milling/sieving → packaging → distribution to food and industrial users.
Demand Drivers- Food additive demand where sulfites are permitted/needed as antioxidants/preservatives under national rules and Codex-aligned specifications (INS 221).
- Regulatory-driven labeling compliance needs in major consumer markets (sulfite declaration thresholds and allergen/intolerance frameworks).
- Industrial demand in pulp & paper, water treatment/dechlorination, and other reducing-agent applications (often traded under the same HS 283210 code family).
Shelf Life- Generally stable when kept dry and sealed; exposure to air/moisture can promote oxidation (quality drift) and caking.
Risks
Regulatory Compliance HighSulfite-related labeling and compliance failures can rapidly disrupt trade and trigger detentions/recalls of finished foods. In the United States, standardized foods with sulfiting agents at a “detectable” concentration (defined as 10 ppm or more) require declaration to avoid misbranding, and in the EU sulphur dioxide/sulphites are among substances requiring labeling above 10 mg/kg or 10 mg/L (as total SO2).Implement supplier CoAs aligned to applicable JECFA/FCC specs, validate sulfite residuals with fit-for-purpose methods, and maintain label/traceability controls that meet destination-market thresholds and terminology requirements.
Trade Classification Risk MediumHS 283210 (“sodium sulphites”) trade statistics and customs documentation may pool food-grade and industrial-grade material, creating sourcing ambiguity and compliance risk if buyers assume food-grade equivalence without specification alignment.Contract explicitly to food-additive specifications (INS 221) where relevant, require destination-market compliant impurity profiles, and segregate food-grade supply chains from technical-grade lanes.
Chemical Logistics MediumBulk chemical logistics (moisture control, packaging integrity, and hazmat handling where applicable) can affect delivered quality; oxidation during transit/storage can reduce effective sulfite content and performance.Use moisture-barrier packaging, verify storage conditions at ports/warehouses, and include acceptance testing for assay and key impurities at receipt.
Input Cost Volatility MediumCosts and availability can be influenced by upstream sulfur dioxide/sulfur supply dynamics, soda ash/alkali markets, and energy prices, with potential knock-on effects on export competitiveness and spot availability.Dual-source across regions, negotiate indexed pricing where feasible, and maintain safety stock for critical applications.
Sustainability- Air emissions and effluent management expectations in inorganic chemical manufacturing (notably for sulfur dioxide handling and sulfate/sulfite-containing wastewater).
- Energy-cost sensitivity typical of bulk inorganic chemicals (indirectly affecting cost competitiveness and trade flows).
Labor & Social- Occupational health and process-safety risk management in chemical plants handling sulfur dioxide and sulfite dust (worker exposure controls and incident prevention).
- Downstream consumer protection expectations because sulfites can trigger allergic-type reactions in susceptible individuals, increasing reputational and recall risk if misdeclared.
FAQ
What is sodium sulfite’s Codex/WHO INS number and functional role in foods?WHO’s JECFA food additives database lists sodium sulfite (disodium sulfite) as INS 221 and classifies it in functional classes such as antioxidant and preservative. In practice, this means it is used to limit oxidation and help preserve certain foods where permitted by regulation and product standards.
Why is sulfite labeling a high-risk compliance area for foods containing sodium sulfite?Because sulfites can cause allergic-type reactions in susceptible individuals, many regulators require clear declaration above defined thresholds. For example, U.S. rules define a “detectable” concentration as 10 ppm or more for certain standardized foods (triggering label declaration), and EU consumer guidance highlights mandatory labeling for sulphur dioxide/sulphites above 10 mg/kg or 10 mg/L (as total SO2).
Which countries are major exporters and importers in global trade statistics for sodium sulphites (HS 283210)?Recent UN Comtrade-derived trade tables (as surfaced via WITS) show China as the leading exporter by value for HS 283210, with other major exporters including Italy, Thailand, Turkey, and India. On the import side, the same HS 283210 tables show large import demand from countries including the United States, Brazil, and South Africa, noting that HS 283210 can include both food-grade and industrial-grade sodium sulphites.