Classification
Product TypeIngredient
Product FormCrystalline powder
Industry PositionFood additive (acidity regulator / buffering agent / raising agent / anticaking agent)
Market
Sodium sesquicarbonate (INS 500(iii)) is an inorganic food additive used globally as an alkali/buffering agent and in applications requiring pH control, anticaking, and leavening functionality under good manufacturing practice conditions. International identity and purity expectations are anchored in JECFA specifications, and the WHO JECFA database lists an ADI of "not specified" (group ADI for carbonates and bicarbonates). Industrial availability is closely linked to soda ash and natural soda minerals (trona and carbonate-rich brines); USGS reports soda ash production is highly concentrated in China, the United States, and Turkey, making upstream supply/demand shifts in those hubs material to input costs and reliability. In Codex GSFA, sodium sesquicarbonate is explicitly listed with multiple functional classes (including acidity regulator, anticaking agent, and raising agent) across a wide set of food categories under GMP.
Major Producing Countries- 중국USGS identifies China as the leading global soda ash producer in 2025; soda ash availability is a key upstream input for sodium sesquicarbonate manufacturing.
- 미국USGS lists the United States as a leading producer of natural soda ash (from trona and carbonate-rich brines), supporting upstream availability for carbonate/bicarbonate-based additives.
- 터키USGS lists Turkey among the leading global soda ash producers, with production largely from natural trona; relevant upstream base for carbonate/bicarbonate salts used in food additives.
- 보츠와나USGS lists Botswana among countries producing natural soda ash from brines; comparatively smaller upstream base than the leading producers.
- 케냐USGS lists Kenya among countries producing natural soda ash from brines; smaller upstream base relative to China/US/Turkey.
- 에티오피아USGS lists Ethiopia among countries producing natural soda ash; smaller upstream base relative to leading producers.
Specification
Physical Attributes- White flakes, crystals, or crystalline powder
Compositional Metrics- INS 500(iii); CAS 533-96-0
- Chemical formula reported in JECFA specifications: C2HNa3O6 · 2H2O (Na2CO3–NaHCO3 · 2H2O)
- JECFA assay ranges: 35.0–38.6% NaHCO3 and 46.4–50.0% Na2CO3
- Freely soluble in water (JECFA characteristics)
- JECFA purity limits include: water 13.8–16.7%; sodium chloride ≤0.5%; iron ≤20 mg/kg; lead ≤2 mg/kg
Grades- JECFA specification monograph (FAO Combined Compendium of Food Additive Specifications) for sodium sesquicarbonate (INS 500(iii))
- Food Chemicals Codex (FCC) specifications referenced for U.S. GRAS listing in 21 CFR 184.1792
ProcessingManufactured via partial carbonation of soda ash solution followed by crystallization, centrifugation, and drying, or by double refining of trona ore (U.S. FDA 21 CFR 184.1792).
Supply Chain
Value Chain- Soda mineral resource extraction (trona or carbonate-rich brines) → soda ash refining (upstream) → partial carbonation/crystallization route or refined-trona route to sodium sesquicarbonate → drying/milling → packaging → shipment to food manufacturers/blenders
Demand Drivers- Formulation needs for buffering/alkalizing and pH control (e.g., dairy and other processed foods) under GMP use conditions
- Use as anticaking/raising agent functionality in dry mixes and bakery-related applications where permitted under Codex GSFA provisions
Risks
Supply Concentration HighSodium sesquicarbonate supply is closely tied to soda ash/trona availability. USGS reports that China, the United States, and Turkey together accounted for approximately 80% of global soda ash production in 2025, meaning disruptions or policy/energy shocks affecting these hubs can propagate into carbonate/bicarbonate-based additive inputs used for food-grade sodium sesquicarbonate.Qualify multiple suppliers across regions and routes (soda-ash carbonation route vs. refined-trona route where available) and maintain inventory buffers for food-grade material meeting JECFA/FCC specifications.
Market Price Volatility MediumUSGS notes global soda ash prices declined during 2025 due to oversupply and weak demand, influenced by China’s capacity expansion in Inner Mongolia; such upstream swings can affect input economics for sodium sesquicarbonate produced from soda ash solutions.Track USGS soda ash market signals and negotiate pricing structures that reduce exposure to short-cycle soda ash price movements.
Regulatory Compliance MediumFood-grade acceptance is specification-driven: JECFA sets identity/purity expectations (including assay and heavy metal limits), Codex GSFA lists functional classes and permitted uses under GMP, and U.S. regulations reference FCC specifications and GMP conditions of use. Material not meeting these specifications can be rejected in regulated food supply chains.Require certificates of analysis aligned to JECFA and relevant national regulations (e.g., FCC where applicable) and verify key purity parameters (assay and heavy metals) in supplier qualification.
Sustainability- Upstream soda ash route choice influences energy and emissions footprint: USGS notes synthetic soda ash typically consumes more energy and costs more than natural soda ash, giving natural producers (notably in China, Turkey, and the United States) an advantage.
- Dependence on soda mineral extraction (trona/brines) creates location-specific environmental management needs (mining/solution extraction and brine handling) in major producing regions such as Wyoming (United States) and Inner Mongolia (China), highlighted in USGS soda ash market commentary.
FAQ
What is sodium sesquicarbonate used for in foods?Codex GSFA lists sodium sesquicarbonate (INS 500(iii)) with functional classes including acidity regulator, anticaking agent, and raising agent, and JECFA describes its functional use as an alkali and buffering agent. In practice, it is used where formulations need pH control/buffering and dry-mix flow or leavening support under good manufacturing practice conditions.
How is food-grade sodium sesquicarbonate manufactured?Under U.S. FDA’s GRAS regulation (21 CFR 184.1792), sodium sesquicarbonate is prepared either by partial carbonation of a soda ash solution followed by crystallization, centrifugation, and drying, or by double refining of trona ore (a naturally occurring impure sodium sesquicarbonate).
What does JECFA say about safety (ADI) for sodium sesquicarbonate?The WHO JECFA database lists sodium sesquicarbonate with an ADI of "not specified," noting it is included in the group ADI for carbonates and bicarbonates.