Classification
Product TypeIngredient
Product FormPowder (anhydrous) / Crystalline hydrates
Industry PositionFood Additive (Acidity Regulator / Buffer; Emulsifying Salt)
Market
Disodium hydrogen phosphate (Na2HPO4; also referred to as disodium phosphate; INS 339(ii)/E339(ii)) is a globally traded inorganic food additive used for buffering/acidity regulation, sequestration, stabilization, and emulsifying-salt functionality. Supply economics and availability are closely linked to the upstream phosphate chain (phosphate rock to phosphoric acid to phosphate salts), which is subject to concentration and policy risks in major mining and processing regions. In the EU, detailed identity, purity, and contaminant specifications are codified for E339(ii), and similar food-ingredient compliance expectations apply across many import markets. Demand is primarily anchored in industrial food manufacturing where pH control, moisture retention, and emulsification performance are needed.
Specification
Physical Attributes- White, odourless powder in anhydrous form; hygroscopic
- Hydrated forms commonly traded include dihydrate, heptahydrate, and dodecahydrate (white, odourless crystalline/efflorescent forms)
- Freely soluble in water; insoluble in ethanol
Compositional Metrics- Food-additive specifications commonly define assay on an anhydrous basis and set a pH range for a 1% solution (alkaline buffer range specified in EU additive specifications)
- Purity expectations commonly include limits for water-insoluble matter and controlled loss on drying (hydrate-state dependent)
- Contaminant limits are commonly specified for fluoride and toxic elements (e.g., arsenic, cadmium, lead, mercury) in EU additive specifications
Grades- Codex INS 339(ii) naming aligned to Codex additive classification system
- EU food additive identity/specification for E339(ii) under Regulation (EU) No 231/2012
Packaging- Moisture-protective multiwall paper bags with inner liner (common bulk format for food-ingredient distribution)
- FIBC/big bags for industrial users where permitted by buyer specifications
- Sealed drums or intermediate packs for higher-specification applications where moisture pickup and contamination control are critical
ProcessingBuffering/acidity regulation performance in aqueous systems; alkaline pH behavior in solution per specificationHygroscopic/efflorescent behavior (hydrate-dependent) can affect flowability and caking risk in dry blends
Supply Chain
Value Chain- Phosphate rock mining -> phosphoric acid production -> neutralization to sodium phosphate salt -> crystallization to target hydrate -> drying/milling -> packaging -> global ingredient distribution
Demand Drivers- Processed food manufacturing needs for buffering/acidity regulation and pH stability
- Emulsifying-salt and stabilization functionality in formulated foods (Codex functional classes listed for INS 339(ii))
- Cost-effective inorganic sequestration/buffering option used across multiple product categories where permitted by regulation
Temperature- Ambient-stable chemical ingredient; protect from humidity and water ingress to prevent caking and specification drift
Shelf Life- Typically long shelf life when stored sealed in dry conditions; moisture uptake (hydrate changes/caking) is a primary practical shelf-life limiter
Risks
Upstream Raw Material Supply HighDisodium hydrogen phosphate supply depends on upstream phosphate rock and phosphoric acid availability; disruptions, export policy shifts, or geopolitically sensitive sourcing in the phosphate chain can tighten supply and raise costs for sodium phosphate food additives.Qualify multiple approved suppliers across different production regions, specify acceptable impurity profiles by origin, and maintain safety stocks for critical formulations.
Regulatory Compliance MediumPhosphate additives are subject to ongoing safety and exposure review; regulatory outcomes (e.g., acceptable daily intake context and permitted uses) can drive reformulation pressure and tighter customer specifications in some markets.Track Codex and regional risk-assessment updates, maintain documented use-level justifications by application, and prepare reformulation alternatives for high-phosphate product portfolios.
Food Safety MediumPhosphate salts can carry specification and contaminant risks (e.g., fluoride and toxic elements) that are explicitly limited in additive specifications; non-conforming lots can trigger border holds, recalls, or customer rejections.Use food-additive specification-aligned COAs, implement lot-level verification testing for key contaminants, and audit upstream raw-material controls.
Quality And Handling LowHygroscopic and hydrate-form variability can cause caking, flow problems, and performance variability in dry blending and dosing operations if storage and packaging are inadequate.Specify particle size and hydrate form where relevant, use moisture-barrier packaging, and control warehouse humidity and first-in-first-out rotation.
Sustainability- Contested-origin upstream phosphate rock (including exports from occupied Western Sahara reported by monitoring organizations) can create ESG and customer-acceptance risk for downstream phosphate-derived ingredients
Labor & Social- Resource-governance and consent-related scrutiny tied to phosphate exports from occupied Western Sahara can create reputational and procurement-policy risk
FAQ
What is disodium hydrogen phosphate used for in food manufacturing?It is used as a multifunctional food additive for buffering/acidity regulation and as a sequestrant, stabilizer, and emulsifying-salt/emulsifier depending on the application. Codex lists these functional classes for INS 339(ii) (disodium hydrogen phosphate), and EU specifications define the identity and purity expectations for E339(ii).
Is disodium hydrogen phosphate the same as E339(ii) / INS 339(ii)?Yes in common additive naming: Codex lists INS 339(ii) as disodium hydrogen phosphate, and EU additive specifications list E 339(ii) as disodium phosphate with chemical naming that includes disodium hydrogen phosphate/orthophosphate (Na2HPO4 and its hydrates).
What are typical buyer-critical specifications for E339(ii) disodium hydrogen phosphate?Buyer specifications typically focus on assay/purity and functional pH range (often specified via a 1% solution), hydrate-state related loss on drying, water-insoluble matter, and limits for contaminants such as fluoride and toxic elements (e.g., arsenic, cadmium, lead, mercury). These parameters are explicitly enumerated in EU additive specifications for E 339(ii).