Classification
Product TypeIngredient
Product FormPowder
Industry PositionFood Additive
Market
Calcium sulfate (commonly known as gypsum in its dihydrate form) is an inorganic food additive used globally for functional roles such as firming/coagulation and anti-caking in selected food categories. Supply for food-grade material is ultimately anchored in gypsum/anhydrite availability plus industrial purification and milling to meet additive specifications. Gypsum production is geographically diverse, with large outputs in countries including China, the United States, Iran, Turkey, Thailand, and Spain, supporting broad feedstock availability for calcium sulfate. Market dynamics in food use are primarily shaped by regulatory compliance (identity and purity specifications) and quality assurance around mineral-origin contaminants, alongside bulk logistics costs for a mineral powder.
Major Producing Countries- 중국Large gypsum/anhydrite producer; key feedstock base for calcium sulfate production
- 미국Large gypsum producer with established industrial minerals processing capacity
- 이란Significant gypsum producer supporting regional supply
- 터키Significant gypsum producer; regional industrial minerals hub
- 태국Notable gypsum producer in Asia supporting industrial and additive supply chains
- 스페인Major European gypsum producer supporting regional industrial minerals markets
Supply Calendar- Global:Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, DecNon-seasonal: mining and industrial processing operate year-round; local weather, energy, and logistics conditions can affect output and shipment timing.
Specification
Major VarietiesCalcium sulfate dihydrate (gypsum, CaSO4·2H2O), Calcium sulfate anhydrous (anhydrite, CaSO4), Calcium sulfate hemihydrate (CaSO4·0.5H2O)
Physical Attributes- White to off-white solid, typically supplied as powder or granules for food use
- Low water solubility relative to many salts; functional performance depends on particle size and hydration state
- Mineral-origin material requires strong control of insoluble matter and extraneous mineral contaminants
Compositional Metrics- Identity and assay/purity aligned to food additive specifications (e.g., Codex/JECFA) or compendial standards (e.g., FCC/USP)
- Limits for heavy metals and other inorganic impurities (e.g., lead/arsenic) are commonly specified for food-grade material
- Moisture/loss on drying and hydration state are commonly controlled due to handling and performance impacts
- Particle size distribution and bulk density are commonly specified for flowability and dosing consistency
Grades- Food additive grade (Codex Alimentarius / JECFA specification context; EU food additive identity as E516)
- Food Chemicals Codex (FCC) grade
- USP/NF grade (where applicable for excipient/food-related uses)
- Technical/industrial grade (not intended for food use)
Packaging- Multiwall paper bags with inner liner or PE-lined sacks to limit moisture uptake
- FIBC/big bags for bulk industrial handling where appropriate
- Sealed containers for higher-specification food and pharmaceutical supply chains
ProcessingUsed as a coagulant in tofu production in some markets (calcium source and texture setting)Used as a firming agent in select processed foods where calcium salts support textureUsed as an anti-caking/processing aid function in dry powdered formulations in some applications, subject to local regulations
Supply Chain
Value Chain- Gypsum/anhydrite extraction or synthetic generation (industrial) -> crushing and beneficiation -> milling and classification -> purification/selection for food-grade -> quality testing to specification -> packaging -> distribution to food manufacturers
Demand Drivers- Regulated use as a food additive where permitted/assigned functions apply (Codex/EU/national frameworks)
- Ongoing demand from soy foods (tofu coagulant use in relevant markets) and selected processed food categories requiring firming/texture control
- Preference for well-specified mineral ingredients supported by compendial standards (e.g., FCC/USP) in higher-assurance supply chains
Temperature- Ambient storage is typical; moisture control is critical to prevent caking and loss of flowability
- Avoid prolonged exposure to high humidity; use sealed packaging and dry warehouses
Shelf Life- Generally stable as a dry mineral ingredient when kept sealed and dry; shelf life is primarily limited by moisture uptake and caking rather than microbial spoilage
- Functional consistency depends on maintaining specification (hydration state and particle size) through storage and handling
Risks
Food Safety HighFood-grade calcium sulfate must meet identity and impurity limits; mineral-origin contamination risks (e.g., heavy metals or extraneous mineral matter) can trigger regulatory non-compliance, recalls, or rejection by buyers.Source to recognized food additive/compendial specifications (Codex/JECFA, FCC/USP as applicable), require routine certificate of analysis plus periodic third-party testing for heavy metals and insoluble matter, and maintain strong raw-material traceability.
Regulatory Compliance MediumPermitted uses, functional classes, and labeling conventions for calcium sulfate (including E-number positioning in the EU) vary by jurisdiction, affecting formulations and market access.Verify allowed uses and maximum levels in each target market and align product identity/specification documentation with Codex, EU, and national requirements.
Quality Consistency MediumVariation in hydration state and particle size can change performance (e.g., coagulation behavior, flowability, and dosing), causing process variability for manufacturers.Control and specify hydration state, particle size distribution, and moisture; qualify suppliers with application testing (e.g., tofu/bakery trials) and maintain change-control agreements.
Logistics LowAs a bulky mineral powder, delivered cost can be sensitive to freight rates and port/transport disruptions, particularly for cross-region shipments.Use regional sourcing where feasible, maintain safety stock for critical SKUs, and qualify alternate suppliers in different logistics corridors.
Sustainability- Mining impacts (land disturbance, dust, and local water management) associated with gypsum/anhydrite extraction
- Energy use and emissions from crushing, drying, and milling operations in industrial minerals processing
- Waste and circularity considerations where gypsum is generated as an industrial byproduct, with strict segregation needed for food-grade suitability
Labor & Social- Worker health and safety risks in mining and mineral processing (dust exposure, heavy equipment, confined spaces)
- Supply-chain due diligence on contractor safety performance and labor standards in extractive industries
FAQ
Is calcium sulfate the same as the food additive E516?Yes. In the EU food additive system, calcium sulfate is identified as E516; international use and specifications are also addressed through Codex/JECFA frameworks referenced in this record.
Why do some tofu producers use calcium sulfate?Calcium sulfate can be used as a coagulant to help set soy proteins and develop tofu texture, and it also contributes calcium; this is a recognized application reflected in how the ingredient is positioned and specified for food use.
What quality checks matter most when buying food-grade calcium sulfate?Buyers typically focus on identity/purity to a recognized specification (Codex/JECFA and/or FCC/USP where applicable), plus impurity controls (notably heavy metals), moisture/loss on drying, insoluble matter, and particle size consistency to ensure predictable performance.