What is Trisodium Phosphate used for in food manufacturing?

Depending on the food category and local regulation, Trisodium Phosphate may be considered for pH increase, buffering, mineral-ion management, protein hydration, ionic-strength adjustment and inclusion in phosphate or emulsifying-salt systems.

Are anhydrous and hydrated Trisodium Phosphate interchangeable?

Not on an equal-weight basis. Hydrated grades contain crystallisation water and may have different assay, bulk density, dissolution behaviour and handling properties. Dosage should be corrected using the supplier's declared active content and certificate of analysis.

What should be checked on a Trisodium Phosphate specification?

Important parameters include hydration state, assay basis, phosphate content, pH, loss on drying or ignition, water-insoluble matter, fluoride, elemental impurities, particle size, bulk density, packaging, shelf life and regulatory declarations.

How should Trisodium Phosphate be added to a process?

A common approach is to add the powder gradually to water under controlled agitation, prepare a uniform premix and meter it into the process while monitoring pH and product response. Addition order, temperature, concentration and compatibility with calcium, magnesium, acids and proteins should be validated by trial.

Is food-grade Trisodium Phosphate permitted in every country and food category?

No. Permitted food categories, maximum levels, good-manufacturing-practice provisions and labelling rules differ by jurisdiction. The buyer and finished-food manufacturer must confirm the current rules for the destination market and intended application.

Which documents should buyers request?

Buyers commonly request a technical specification, lot-specific certificate of analysis, safety data sheet, allergen and GMO statements, origin and manufacturer information, shelf-life data, food-grade declaration, packaging specification, traceability details and market-specific compliance documents.

Food-Grade Phosphates, Salts & Sequestrants

Trisodium Phosphate — E 339(iii)

Name: Trisodium Phosphate
Brand: Global Food Additives, Inc.
SKU: GFA-TSP-E339III

Trisodium Phosphate, also known as trisodium orthophosphate or tribasic sodium phosphate, is a water-soluble, highly alkaline orthophosphate used in controlled food-manufacturing systems. Depending on the application and applicable regulation, it may support pH adjustment, buffering, mineral-ion control, ionic-strength modification, protein hydration and phosphate-system formulation.

Commercial products may be supplied as anhydrous or hydrated material. The hydration state materially affects active content, bulk density, transport efficiency, dissolution behaviour and required dosage. Procurement documents should therefore specify the exact chemical form, assay basis, application, destination market and required compliance standard rather than requesting only “TSP.”

Request quotation Review technical data

Food-grade Trisodium Phosphate E339(iii) crystals or powder

Grade-definition requirement: Anhydrous Trisodium Phosphate and hydrated Trisodium Phosphate are not equal-weight substitutes. Always identify the hydration state and use the lot-specific assay or active-content value when calculating process dosage.

Product identity

Product name	Trisodium Phosphate
Common synonyms	Trisodium orthophosphate, tribasic sodium phosphate, sodium phosphate tribasic
Food additive identity	E 339(iii) / INS 339(iii)
Chemical family	Inorganic sodium orthophosphate
Anhydrous formula	Na₃PO₄
Hydrated formula	Na₃PO₄·nH₂O
Molecular weight	163.94 g/mol for anhydrous Na₃PO₄
CAS number — anhydrous	7601-54-9
CAS number — dodecahydrate	10101-89-0
EC / EINECS number	231-509-8
Typical appearance	White, odourless crystals, granules or crystalline powder
Water behaviour	Freely soluble in water; forms a strongly alkaline phosphate solution
Solubility in ethanol	Insoluble
Typical commercial forms	Anhydrous, monohydrate and dodecahydrate; other hydrate forms may be defined by regional or supplier specifications

Primary technical functions

Alkalinity and pH adjustment: raises process or formulation pH where a strong alkaline phosphate is technically suitable.
Buffer-system component: can be combined with mono- or disodium phosphates to establish a selected phosphate-buffer range.
Mineral-ion management: interacts with calcium, magnesium and other multivalent ions, influencing hardness, precipitation and product stability.
Protein functionality: may affect protein charge, hydration, extraction and water binding through pH and ionic-strength modification.
Emulsifying-salt formulation: may be evaluated as one component of a broader phosphate system, particularly where mineral balance and pH must be controlled.
Process standardisation: can help compensate for controlled variation in raw-material acidity or process-water mineral composition.

Formulation caution: Trisodium Phosphate is a comparatively alkaline phosphate. Excessive addition can produce undesirable flavour, texture, colour, sodium contribution, protein damage or regulatory non-compliance.

Specification review

Technical specification benchmark

The values below are useful as a regulatory and purchasing reference for E 339(iii), but they are not a substitute for the contracted supplier specification. Every purchase order should identify the required edition of the standard, analytical method, hydrate form and reporting basis.

Parameter	EU E 339(iii) benchmark	Purchasing interpretation
Identity	Trisodium monophosphate / Trisodium phosphate / Trisodium orthophosphate	Confirm that the product is orthophosphate and not tripolyphosphate, pyrophosphate or a blended phosphate.
Hydration forms	Anhydrous and hydrates containing 1/2, 1, 6, 8 or 12 H₂O	State the required hydrate explicitly because water content changes active mass, bulk density and dosage.
Assay — anhydrous and most hydrates	Not less than 97.0% Na₃PO₄, calculated on the dried basis	Confirm whether the supplier reports dry basis, as-is basis or another contractual basis.
Assay — dodecahydrate	Not less than 92.0% Na₃PO₄, calculated on the ignited basis	Do not interpret this value as equal to as-is anhydrous active content without reviewing the test method and COA.
P₂O₅ content	40.5%–43.5% on the anhydrous basis	Useful for identity, composition control and comparison between phosphate sources.
pH	11.5–12.5 for a 1% solution	Indicates strong alkalinity; the exact preparation method, temperature and water quality should be controlled.
Water-insoluble matter	Not more than 0.2% on the anhydrous basis	Relevant to solution clarity, filtration load, deposits, nozzle blockage and visible residue.
Loss on ignition — anhydrous	Not more than 2.0%	Supports confirmation of moisture and volatile-content control.
Loss on ignition — monohydrate	Not more than 11.0%	Verify the specified hydrate and analytical preparation.
Loss on ignition — dodecahydrate	45.0%–58.0%	Large ignition loss reflects crystallisation water and the defined dodecahydrate composition.
Fluoride	Not more than 10 mg/kg, expressed as fluorine	Include on the COA when required by the purchase specification.
Arsenic	Not more than 1 mg/kg	Confirm analytical method, reporting limit, accredited-laboratory status and destination-market requirements for elemental impurities.
Cadmium	Not more than 1 mg/kg
Lead	Not more than 1 mg/kg
Mercury	Not more than 1 mg/kg

Contract-control note: Supplier specifications may be narrower, wider or based on another recognised standard such as FCC, JECFA, a national pharmacopoeia or a customer-specific requirement. The purchase contract should state which specification takes precedence if documents differ.

Grade engineering

Selecting anhydrous or hydrated material

Anhydrous grade

Higher Na₃PO₄ content per transported kilogram.
Can reduce freight and storage volume when compared on an equivalent-active basis.
May exhibit different flow, dusting, dissolution and heat-of-wetting behaviour from hydrated grades.
Requires effective moisture protection because phosphate products can absorb atmospheric moisture and form lumps.
Best suited where accurate dry dosing and active-content efficiency are purchasing priorities.

Hydrated grade

Contains chemically associated crystallisation water.
Generally requires more product mass to deliver the same amount of anhydrous Na₃PO₄.
May provide different handling, dissolution or dust characteristics.
Bulk density and pallet efficiency can differ substantially from anhydrous material.
The exact hydrate must appear on the specification, label and COA.

Equivalent-active dosage calculation

When changing supplier or hydrate form, recalculate dosage using the declared lot or contractual active fraction:

Required new product mass = target anhydrous-equivalent mass ÷ new product active fraction

For direct supplier-to-supplier replacement, a practical comparison is:

New product mass = current product mass × current active fraction ÷ new active fraction

Active fractions should be expressed as decimals and taken from comparable analytical bases. A dry-basis assay must not be compared directly with an as-is assay unless moisture or ignition-loss correction has been applied.

Application engineering

Potential food-manufacturing applications

Suitability depends on the exact food category, formulation, legal permission, total phosphate level, sodium target, process conditions and desired finished-product characteristics. The following areas should be treated as technical evaluation pathways rather than universal use claims.

Application area	Potential technical purpose	Critical validation points
Processed cheese and cheese preparations	pH adjustment, calcium-ion management and support within a designed emulsifying-salt or phosphate blend.	Melt behaviour, firmness, oil separation, protein hydration, calcium balance, flavour, final pH and applicable additive limits.
Meat and poultry systems	Modification of brine pH and ionic conditions that may influence protein extraction, water binding and processing yield.	Total phosphate, sodium, pickup, purge, cook yield, texture, colour, sensory profile, injection uniformity and jurisdictional rules.
Fish and seafood processing	Phosphate-system adjustment for moisture management, mineral interactions and process-yield control.	Water pickup, drip loss, thaw loss, cooking loss, texture, surface residue, labelling and market-specific restrictions.
Plant-protein processing	pH-shift processing, hydration, extraction support and mineral-interaction control.	Protein solubility, flavour, colour, viscosity, sediment, sodium contribution and downstream neutralisation requirements.
Bakery and cereal products	Controlled alkalinity, buffering or mineral management in specialised formulations.	Leavening balance, dough rheology, browning, crumb colour, flavour, mineral interactions and final pH.
Beverage bases and concentrates	Neutralisation, buffer preparation or process-water mineral control where strong alkalinity is specifically required.	Haze, precipitation, flavour, carbonation response, acid-addition sequence, heat stability and package compatibility.
Sauces, emulsions and prepared foods	pH correction and inclusion in a broader mineral-control or phosphate formulation.	Emulsion stability, viscosity, taste, colour, preservative performance, protein response and final sodium level.
Industrial food-process water	Selected pH or hardness-control duties where food-contact and process rules permit the intended use.	Precipitation, scale, equipment compatibility, rinse validation, wastewater phosphorus load and processing-aid status.

Functional mechanism

How Trisodium Phosphate affects a formulation

pH and protein charge

Trisodium Phosphate produces an alkaline solution. Increasing pH changes the net electrical charge of many proteins and can move the system away from the protein isoelectric region. Depending on the raw material, this may alter swelling, solubility, extraction, viscosity and water retention.

The response is not linear in every food matrix. Protein source, salt concentration, temperature, shear, residence time and the presence of calcium or magnesium can materially change the result.

Ionic strength and mineral interactions

Sodium and phosphate ions influence ionic strength and interact with multivalent minerals. This can be beneficial in a designed system, but concentrated contact with calcium- or magnesium-rich ingredients can also generate haze, sediment or phosphate precipitation.

Water hardness, ingredient addition order and local concentration should therefore be evaluated during laboratory and pilot trials.

Buffer-system design

Trisodium Phosphate is normally selected for its alkaline contribution, not as a universal stand-alone buffer. Where tighter pH control is required, formulators may evaluate a controlled ratio of mono-, di- and trisodium phosphates.

Buffer selection should consider target pH, buffering capacity, sensory impact, sodium contribution, acid load and the legal status of every phosphate component.

Process-yield versus product quality

Increased water binding or process yield must be evaluated together with texture, flavour, colour, nutritional declaration, purge, cooking loss and consumer expectations. A technically measurable yield increase is not automatically the optimum commercial result.

Plant implementation

Process integration and dosing guidance

Recommended development sequence

Define the target function. Specify whether the objective is pH adjustment, buffering, mineral control, protein functionality, water binding or inclusion in a phosphate blend.
Confirm regulatory eligibility. Check the food category, maximum level or GMP provision, labelling rules and any cumulative phosphate limit in the destination market.
Characterise the raw materials. Record starting pH, acidity, calcium, magnesium, protein, salt, moisture, temperature and process-water hardness.
Select the exact grade. Define anhydrous or hydrate form, active-content basis, particle size, bulk density and required compliance standard.
Conduct bench trials. Use controlled dose increments and measure pH, appearance, viscosity, solubility, yield, texture and sensory response.
Verify addition order. Compare direct addition with aqueous premixing and assess local high-pH effects, precipitation and dispersion time.
Scale to pilot production. Confirm mixing energy, dosing accuracy, hold time, temperature, filtration, equipment compatibility and batch-to-batch repeatability.
Establish release limits. Set internal control ranges for ingredient dose, finished-product pH, total phosphate, sodium, yield and critical quality attributes.

Premix preparation

Use potable or otherwise specification-compliant process water.
Add powder gradually to water under effective agitation rather than creating a high-concentration stationary layer.
Control dust, splashing and solution temperature during charging.
Allow sufficient mixing time to obtain a visually uniform solution.
Check for insoluble matter, haze or mineral precipitate before dosing.
Use a defined solution concentration and preparation record to improve dosing repeatability.

Addition-order controls

Avoid uncontrolled direct contact between concentrated phosphate solution and concentrated acid.
Avoid local overdose onto sensitive proteins or colour systems.
Evaluate calcium- and magnesium-containing ingredients for precipitation risk.
Meter the premix into a well-agitated zone whenever possible.
Monitor pH after adequate equilibration rather than immediately beside the dosing point.
Validate whether hot or cold addition produces the preferred dissolution and product response.

Scale-up risk: A laboratory formula can behave differently in a production vessel because local concentration, shear, dosing time, water hardness and temperature gradients are different. Production implementation should include a controlled pilot or first-industrial-batch protocol.

Quality assurance

Incoming quality-control and COA review

Identity and composition

Exact product and chemical name
E 339(iii) or relevant destination-market identity
Anhydrous or declared hydrate form
CAS and EC identifiers
Assay with stated analytical basis
P₂O₅ or phosphate content
Loss on drying or loss on ignition
pH with solution concentration and method

Purity and physical performance

Water-insoluble matter
Fluoride
Lead, arsenic, cadmium and mercury
Iron or other customer-specified trace elements
Particle-size distribution
Bulk and tapped density where dosing equipment requires it
Colour or whiteness where visually critical
Flowability, caking or sieve residue where specified

Traceability controls

Manufacturer name and approved manufacturing site
Country of origin and country of manufacture
Batch or lot number
Manufacturing and retest or expiry date
COA authorisation and issue date
Purchase-order and specification revision reference
Packaging code and net-weight verification
Upstream lot traceability where contractually required

Food-safety declarations

Food-grade or food-additive compliance statement
Allergen statement and cross-contact information
GMO status
Irradiation status
Nanomaterial status where required
Animal-origin or vegan/vegetarian status
Halal and Kosher certificates when requested
Contaminant, pesticide or microbiological statements where relevant
Food-fraud and supply-chain traceability information

Basis-matching rule: Assay, phosphate content, moisture and ignition loss must be interpreted together. A result reported on a dried or ignited basis cannot be used as an as-is dosage value without the appropriate mass-balance correction.

Supply-chain planning

Packaging, storage and logistics

Packaging considerations

Packaging depends on the manufacturer, grade, shipment size and destination. Common commercial options may include lined multiwall bags, woven polypropylene bags with an inner liner, bulk bags or other moisture-resistant industrial formats.

Confirm the following before purchase:

Net weight per bag or bulk container
Primary-contact liner material
Tamper evidence and bag-closing method
Bags per pallet and net pallet weight
Pallet material and dimensions
Stretch wrapping, top sheet and corner protection
Container loading quantity and maximum stack height
Private-label, neutral-label or manufacturer-label requirement
Food-contact compliance for packaging components

Storage controls

Store in a cool, dry and well-ventilated warehouse.
Keep bags tightly closed and protected from humidity.
Store on clean pallets and away from walls or wet floors.
Protect from rain, condensation and direct water contact.
Segregate from acids and incompatible chemicals.
Prevent contamination by dust, pests, odours and foreign material.
Reseal partly used packaging immediately after dispensing.
Apply FEFO or the supplier-recommended stock-rotation system.
Use the shelf life and storage temperature stated by the supplier.

Logistics data to include in a quotation

Requested quantity	Trial quantity, pallet quantity, full-container load or annual forecast
Packaging	Required bag size, liner, palletisation and labelling format
Destination	City, port, country and final food market
Delivery basis	Requested Incoterm, delivery point and target shipment window
Container conditions	Palletised or floor-loaded, moisture protection and loading limits
Documents	COA, specification, SDS, origin, health certificate, analysis certificate or other import documents

Operational safety

Handling and workplace controls

Trisodium Phosphate solutions are strongly alkaline. Workplace handling must follow the current supplier Safety Data Sheet, local occupational regulations and the facility’s chemical-risk assessment.

Typical control measures

Minimise airborne dust during bag opening and charging.
Use enclosed transfer or local extraction where practical.
Wear suitable eye, skin and respiratory protection as defined by the SDS.
Provide accessible eyewash and emergency washing facilities.
Train operators on alkaline-material handling and spill response.
Prevent unauthorised mixing with acids or incompatible materials.
Use clearly identified, dedicated or validated-clean dispensing tools.

Equipment and material compatibility

Confirm compatibility of tanks, seals, pumps, hoses and dosing lines with the intended solution concentration and temperature.
Review compatibility with metals, coatings and elastomers before using concentrated alkaline phosphate solutions.
Avoid dead legs or stagnant zones where concentrated solution can crystallise or leave deposits.
Include water-flush or validated cleaning steps where the process permits.
Inspect dosing nozzles, filters and strainers for mineral deposits.

Market compliance

Regulatory and labelling considerations

European Union

Trisodium Phosphate is identified as E 339(iii). The compositional specification and the permission to use the additive are separate regulatory questions. A product may comply chemically with the E 339(iii) specification while a proposed use is still restricted or not permitted in a particular food category.

Buyers should review the current consolidated versions of:

United States

Under 21 CFR 182.1778, sodium phosphate in mono-, di- and tribasic form is listed as generally recognised as safe when used in accordance with good manufacturing practice. This general provision does not replace product-specific standards of identity, meat or poultry requirements, labelling rules or other conditions that may apply to the finished food.

Reference: 21 CFR 182.1778 — Sodium phosphate

Other destination markets

Codex references, GCC rules, national positive lists, customs classifications and local labelling requirements should be checked separately. Market acceptance must not be assumed from an EU E number, U.S. GRAS status or a supplier’s general food-grade statement.

Confirm the permitted food category.
Confirm the maximum level, quantum satis or GMP condition.
Review total-phosphate calculation requirements.
Determine whether use is additive, ingredient or processing aid.
Confirm the required declaration name on the finished-food label.
Review sodium and nutrition-labelling consequences.
Check import registration, health-certificate and language requirements.

Responsibility statement: Final regulatory approval belongs to the buyer and finished-food manufacturer. Regulations, food categories, maximum levels and required label wording can change and must be checked for the intended market at the time of use.

Resource efficiency

Process efficiency and environmental control

Phosphate optimisation should consider both product performance and plant-wide phosphorus management. Excess dosage can increase raw-material cost, sodium contribution, cleaning demand and phosphorus loading in wastewater.

Manufacturing-efficiency measures

Use calibrated loss-in-weight or validated volumetric dosing.
Track actual ingredient use against standard batch consumption.
Correct recipes when changing hydrate or supplier assay.
Reduce bag residue through suitable emptying and handling practices.
Optimise solution concentration to minimise unnecessary water movement.
Use pilot data to establish the minimum effective dose.

Wastewater and spill controls

Prevent dry powder and concentrated solution from entering drains.
Capture spills using the procedure defined by the SDS and site plan.
Include phosphate inputs in the facility’s phosphorus mass balance.
Monitor wastewater phosphorus where discharge permits require it.
Coordinate formulation changes with wastewater-treatment personnel.
Dispose of damaged or off-specification material through approved channels.

Supplier qualification

Documents to request before approval

Core product documents

Current product specification or Technical Data Sheet
Representative and lot-specific Certificate of Analysis
Current Safety Data Sheet
Product label or label draft
Packaging and pallet specification
Shelf-life and storage statement
Manufacturing-flow summary where qualification requires it
Country of origin and manufacturing-site statement

Compliance and certification documents

Food-grade compliance declaration
Applicable EU, FCC, JECFA or national-standard statement
Allergen and cross-contact declaration
GMO, irradiation and nanomaterial statements
Halal and Kosher certificates where required
Quality-system or food-safety certification
Traceability and recall-system declaration
Heavy-metal and contaminant compliance statement

Additional documents for international trade

Commercial invoice and packing-list format
Certificate of origin
Health, sanitary or free-sale certificate where applicable
Certificate of analysis legalisation or chamber approval if required
Transport classification and non-dangerous-goods statement where applicable
Container loading plan and pallet declaration
Wood-packaging or ISPM 15 documentation where required
Importer-specific registration or product-notification documents

Commercial preparation

Information required for an accurate quotation

Inquiry field	Information to provide
Product identity	Trisodium Phosphate, E 339(iii), with the preferred synonym or existing supplier reference
Grade	Anhydrous, monohydrate, dodecahydrate or specification-equivalent option
Required standard	EU 231/2012, FCC, JECFA, national standard or attached customer specification
Application	Finished-food category and intended technical function
Target parameters	Assay, pH, P₂O₅, particle size, bulk density, insolubles and impurity limits
Quantity	Sample, trial order, pallet, container quantity and annual forecast
Packaging	Bag size, liner, palletisation, label language and private-label requirement
Destination	Delivery city, port, country and final regulatory market
Commercial term	Requested Incoterm, currency, payment preference and delivery window
Documentation	COA, specification, SDS, origin, certifications and import documents
Reference material	Existing COA, specification, label, approved sample or competitor grade

Technical questions

Frequently asked questions

What is the correct E number for Trisodium Phosphate?

The specific designation is E 339(iii). E 339 is the wider sodium phosphate group, which also includes monosodium phosphate E 339(i) and disodium phosphate E 339(ii).

What is the difference between Trisodium Phosphate and Sodium Tripolyphosphate?

Trisodium Phosphate is an orthophosphate with the formula Na₃PO₄ and the identity E 339(iii). Sodium Tripolyphosphate is a condensed phosphate with a different structure, additive identity, specification and functional profile. They are not direct one-for-one substitutes.

Are anhydrous and hydrated grades interchangeable?

Not on an equal-weight basis. Hydrated material contains crystallisation water and may differ in assay, bulk density, dissolution behaviour and handling. Dosage must be corrected using comparable active-content data from the supplier specification or COA.

Why is solution pH important?

Trisodium Phosphate is strongly alkaline. Its pH response influences protein charge, water binding, mineral interactions, texture, flavour, colour and the performance of other ingredients. Solution concentration, water quality and temperature should be controlled when comparing results.

Can it be added directly as a dry powder?

Direct dry addition may be possible in some processes, but an aqueous premix often improves dispersion and dosing control. The preferred method depends on mixing energy, batch size, powder handling, local concentration risk and the sensitivity of the food matrix.

Can Trisodium Phosphate cause precipitation?

Yes. Concentrated phosphate can interact with calcium, magnesium and other multivalent ions. Water hardness, ingredient composition, temperature, pH and addition order should be evaluated for haze, sediment or scale formation.

How is the correct dosage determined?

Dosage should be established through laboratory and pilot trials based on the target function, raw-material properties, hydrate form, assay, final pH, total phosphate, sodium contribution and applicable legal limit. Supplier guidance cannot replace application validation.

What is the difference between food grade and technical grade?

Food-grade material should comply with an identified food-additive specification and be manufactured, packed, documented and traceable for food use. Technical grade may have different impurity controls, manufacturing systems, packaging or documentation and should not be substituted without formal food-safety and regulatory approval.

Which COA values should be compared between suppliers?

Compare hydrate form, assay basis, P₂O₅, pH, ignition loss or moisture, insoluble matter, fluoride, elemental impurities, particle size, bulk density and the analytical methods used. Values reported on different bases should be normalised before comparison.

Is Trisodium Phosphate permitted in every food category?

No. Authorised categories, maximum levels, GMP provisions and labelling rules vary by jurisdiction. Chemical compliance with an E 339(iii) specification does not automatically authorise every proposed use.

What storage conditions are recommended?

Store in sealed, moisture-resistant packaging in a cool, dry and well-ventilated area. Protect from water, condensation, acids, contamination and strong odours. Follow the supplier’s stated shelf life and storage conditions.

Can Global Food Additives review an existing specification?

Yes. Buyers can submit an existing specification, COA, label, approved sample reference or required standard. Supplier options can then be compared on identity, hydrate, active basis, purity, packaging, documentation, origin, quantity and destination.

Request a technical quotation

Tell us the grade, specification and delivery conditions you require.

For an accurate review, include the requested hydrate form, applicable standard, target assay, application, quantity, packaging, destination, Incoterm, shipment timing and required documents. Existing specifications, COAs or product labels can be referenced in the message.

Our team will review the inquiry and respond from orders@foodgradeadditives.com .

orders@foodgradeadditives.com +90 507 856 26 11 Istanbul, Turkey