Market
Calcium hydroxide (slaked/hydrated lime; INS 526 / E 526) is a mineral-derived food additive used primarily as an acidity regulator and firming agent, with usage provisions referenced in Codex GSFA and national regulations. Global availability is closely linked to the broader lime industry because calcium hydroxide is produced by hydrating lime made from limestone, and large lime-producing countries (e.g., China, the United States, and India) underpin supply capacity. International trade exists, but supply is often regionally oriented because the product is bulky, alkaline, and commonly distributed through industrial chemical and food-ingredient channels. Commercial differentiation is driven by compliance with food-grade purity and contaminant limits (e.g., lead/arsenic and other inorganic impurities) and consistent particle-size/handling characteristics.
Market GrowthNot Mentioned
Major Producing Countries- ChinaLargest lime-producing country in USGS world lime production statistics; lime production base is a proxy for hydrated lime (calcium hydroxide) supply capacity.
- IndiaLarge lime-producing country in USGS world lime production statistics; lime production base supports calcium hydroxide supply.
- United StatesLarge lime-producing country in USGS world lime production statistics; calcium hydroxide is produced by hydration of lime under U.S. food ingredient definitions.
- RussiaSignificant lime-producing country in USGS world lime production statistics.
- BrazilSignificant lime-producing country in USGS world lime production statistics.
- JapanSignificant lime-producing country in USGS world lime production statistics.
- TurkiyeSignificant lime-producing country in USGS world lime production statistics.
- GermanySignificant lime-producing country in USGS world lime production statistics.
Specification
Physical Attributes- White powder (food additive specification descriptions commonly reference a white powder form).
- Slightly soluble in water; forms alkaline suspensions/slurries for use as a processing aid or pH adjuster.
Compositional Metrics- Food additive specifications may set a minimum assay (e.g., EU specification indicates not less than 92.0% for E 526).
- Food additive specifications may include impurity limits for inorganic contaminants (e.g., EU specification lists limits for acid-insoluble ash, magnesium and alkali salts, barium, fluoride, arsenic, and lead).
- JECFA evaluation entry for calcium hydroxide lists an ADI of 'not limited' in the WHO JECFA database.
Grades- Food additive grade: INS 526 / E 526 meeting applicable Codex/JECFA and jurisdictional purity specifications.
- Technical/industrial grade: used in non-food applications (not interchangeable with food additive grade without demonstrated specification compliance).
Packaging- Moisture-protective multiwall paper bags (commonly used for powdered inorganic food ingredients).
- Bulk bags (FIBCs) or bulk pneumatic delivery for large-volume industrial users, depending on market and facility design.
ProcessingStrongly alkaline; used for pH adjustment and firming/texture effects in certain processed foods.Absorbs carbon dioxide from air over time (can carbonate), so moisture/air exposure control matters for storage and consistent performance.
Risks
Food Safety HighFood additive supply can be disrupted by purity and contaminant non-compliance (e.g., heavy metals and inorganic impurities) versus jurisdictional specifications for E 526 / INS 526, leading to border rejections, customer delisting, or downstream product holds where calcium hydroxide is used under GMP provisions.Qualify suppliers against applicable food additive specifications (e.g., EU E 526 specifications and JECFA/Codex references), require lot-level certificates of analysis, and verify via periodic third-party testing for key impurities (e.g., Pb/As/fluoride/acid-insoluble matter) aligned to buyer and regulatory requirements.
Energy And Carbon Policy MediumUpstream lime kilns generate both process CO2 emissions from calcination and combustion emissions from fuel use; energy price volatility and carbon policy can raise production costs or constrain supply in regions with tighter emissions controls.Diversify sourcing across regions, assess supplier energy/emissions management plans, and incorporate energy/carbon cost pass-through clauses for longer-term supply agreements where feasible.
Occupational Safety MediumCalcium hydroxide dust is irritating/corrosive to eyes, skin, and the respiratory system; poor dust control can cause injuries, regulatory findings, and operational downtime at producers and end users.Implement engineering controls (enclosed handling, local exhaust), enforce PPE requirements, and use documented safe handling procedures consistent with recognized occupational hygiene guidance.
Regulatory Compliance MediumPermitted uses and conditions vary by jurisdiction (e.g., Codex GSFA provisions, EU Union list conditions, and national rules), and changes or differing interpretations can affect addressable markets and customer formulations.Maintain an up-to-date regulatory dossier (Codex/JECFA references and key market regulations) and provide application-specific compliance support to customers (food category and maximum levels where applicable).
Sustainability- High CO2 emissions exposure in upstream lime manufacturing: process CO2 from calcination and fuel-combustion emissions are material considerations for cost and compliance in many jurisdictions.
- Local environmental controls for particulate/dust and hazardous air pollutants at lime manufacturing facilities can affect operating costs and continuity.
Labor & Social- Worker health and safety risks from caustic/irritant dust exposure during handling, conveying, and packaging; requires PPE, dust control, and training.
- Occupational exposure management is relevant across the supply chain (production sites, warehouses, and end-user facilities handling powders/slurries).
FAQ
Is calcium hydroxide recognized internationally as a food additive, and what is it used for?Yes. Codex GSFA lists calcium hydroxide as INS 526 and identifies it as an acidity regulator and firming agent, with food-category provisions and maximum levels/GMP notes depending on the category.
What are the main quality risks for food-grade calcium hydroxide in global trade?The main risks are failing food additive purity/contaminant specifications (for example, limits for lead, arsenic, fluoride, and insoluble matter referenced in EU specifications for E 526 and similar buyer specs), which can trigger shipment rejection or downstream product holds.
How is calcium hydroxide produced for food ingredient use?U.S. food ingredient regulations describe calcium hydroxide (slaked/hydrated lime) as being produced by the hydration of lime; industrially, lime is made by calcining limestone and then hydrated (slaked) with water to form calcium hydroxide.