Phosphoric Acid E338
Food-grade Phosphoric Acid is an industrial acidulant and acidity regulator used for pH control, beverage acidulation, flavour balance, buffering, process consistency and formulation standardisation. It is especially important in carbonated beverages, cola-type drinks, beverage concentrates, sauces, dressings, confectionery systems, dairy-style formulations and selected processed foods where controlled acidity directly affects taste, stability and processing performance.
This page is prepared for purchasing teams, R&D formulators, QA departments, importers and industrial food manufacturers who need a practical technical starting point for grade comparison, supplier evaluation, concentration review, packaging selection, document collection and quotation requests.
Product identity
| Product | Phosphoric Acid |
|---|---|
| Common references | Food Grade Phosphoric Acid, Orthophosphoric Acid, E338, INS 338 |
| Category | Acidulants & Acidity Regulators |
| Function | Acidity regulator, acidulant, pH control agent, buffering ingredient and flavour-balance acid |
| E / INS number | E338 / INS 338 |
| CAS / identity | 7664-38-2 |
| Chemical formula | H3PO4 |
| Chemical nature | Triprotic inorganic acid supplied as an aqueous food-grade concentrate |
| Typical commercial form | Clear, colourless to slightly yellowish liquid concentrate; commonly supplied as 75%, 80% or 85% depending on supplier and market |
| Key buying issue | Concentration, food-grade purity, impurity profile, packaging compatibility, safety handling and destination-market compliance must be confirmed before purchase |
Application fit
Potential use areas may include:
- Carbonated beverages and cola-type drinks
- Beverage concentrates, syrups and premixes
- Flavoured waters and selected acidified beverages
- Confectionery and sugar systems
- Sauces, dressings and savoury preparations
- Dairy systems and dairy-style products
- Processed foods requiring pH adjustment
- Food manufacturing systems requiring controlled acidity or buffering
Industrial functionality overview
Phosphoric Acid is selected when a manufacturer needs a strong, clean, mineral-acid profile with effective pH reduction and phosphate-based buffering contribution. In beverage and food systems, pH affects flavour perception, microbial control strategy, preservative performance, colour stability, protein behaviour, viscosity, heat-treatment response and finished-product shelf life.
Compared with many organic acidulants, Phosphoric Acid can provide a sharper, less fruity acidity profile. This is why it is frequently associated with cola-type beverages and dark soft drinks. In industrial formulation, the selected acid should be evaluated not only for pH reduction, but also for taste profile, buffering behaviour, interaction with minerals, preservative system, processing equipment and label requirements.
Functional benefits by application
Carbonated beverages and cola-type drinks
In carbonated beverages, Phosphoric Acid supports the characteristic sharp acidity, low pH and flavour balance of cola-type and dark soft drinks. It can help standardise acid bite, improve sweetness balance and support the overall microbial control strategy when used with appropriate processing, preservatives and packaging.
- Provides clean, sharp acidity and strong pH adjustment.
- Supports flavour balance in high-sweetness beverage systems.
- Can help stabilise target pH in beverage concentrates and finished drinks.
- Requires compatibility testing with colours, flavours, sweeteners, preservatives and carbonation.
Beverage concentrates and syrups
In concentrates, acid addition affects viscosity, flavour release, preservative effectiveness, colour stability and dilution behaviour. Phosphoric Acid concentration, dosing accuracy and mixing procedure are important because concentrate systems are often high in sugar, sweeteners, flavours and soluble solids.
- Supports consistent acid delivery after dilution.
- Helps adjust concentrate pH before filling or blending.
- Requires controlled dosing to avoid local over-acidification.
- Should be evaluated after storage, dilution and final beverage preparation.
Sauces, dressings and savoury systems
In sauces, dressings, marinades and savoury preparations, Phosphoric Acid may be used for pH adjustment, flavour sharpening and process standardisation. The final acid system should be tested with salt, starches, gums, proteins, oils, emulsifiers and heat treatment.
- Can help control pH in acidified savoury systems.
- Supports sharpness and balance in salty or sweet-sour recipes.
- Requires testing for emulsion stability, viscosity and flavour impact.
- Should be reviewed with preservatives, pasteurisation and packaging conditions.
Confectionery and sugar systems
In selected confectionery systems, Phosphoric Acid can contribute acidity, sourness balance and pH adjustment. It should be evaluated carefully because acid type affects sweetness perception, inversion, gelling behaviour, colour stability, flavour release and shelf-life texture.
- Supports acid profile design in selected sugar systems.
- Can be used with other acids for a blended acidity curve.
- Requires testing under cooking, depositing, cooling and storage conditions.
- Acid timing may affect gel formation, sugar inversion and final texture.
Dairy and dairy-style systems
In dairy and dairy-style applications, pH adjustment must be handled with caution because proteins, minerals, stabilisers and heat treatment are highly pH-sensitive. Phosphoric Acid may be reviewed for selected pH-control functions, but the grade and dosage must be validated in the real matrix.
- Can help adjust pH in selected processed dairy-style systems.
- Requires careful review of protein stability and mineral balance.
- Should be tested for precipitation, sediment, viscosity change and flavour impact.
- Process sequence and dilution are critical to avoid local protein destabilisation.
Processed foods and pH standardisation
In processed foods, Phosphoric Acid may be considered where the target is controlled pH, consistent acidity and process repeatability. It can be used alone or as part of an acid system, depending on the flavour profile, regulatory market and finished-product requirements.
- Supports pH standardisation between production batches.
- Can improve consistency of acidified formulations.
- Requires evaluation with colour, flavour, texture and preservative systems.
- Final use level must follow local regulation and customer specification.
Technical grade selection criteria
Food-grade Phosphoric Acid should be selected by concentration, purity, impurity limits, packaging format and technical suitability. A lower unit price may not represent the best industrial option if concentration, documentation, impurity profile, packaging compatibility or logistics conditions do not match the buyer’s requirements.
| Selection factor | Why it matters |
|---|---|
| Assay / concentration | Determines dosage rate, acid strength, dilution requirement, freight economics and formulation calculations. |
| Food-grade status | Confirms that the material is supplied under appropriate purity and documentation expectations for food use. |
| Appearance and clarity | Important for beverage concentrates, clear systems, quality control and contamination detection. |
| Impurity profile | Arsenic, lead, heavy metals, fluoride, chloride, sulphate and iron limits may be critical for food-grade approval. |
| Density | Used for tank measurement, dosing calibration, mass balance and concentration verification. |
| Production route and purification | Food-grade grades typically require tighter impurity controls than fertilizer or industrial grades. |
| Packaging compatibility | Corrosive liquid handling requires suitable drums, IBCs, tank materials, seals, pumps and transfer lines. |
| Regulatory destination | Permission, use level and label declaration can vary by market and food category. |
| Logistics and safety | Hazard classification, storage, transport rules and unloading method must be checked before shipment. |
Specification points to request
A complete sourcing review should be based on the supplier’s current technical data sheet and batch-specific certificate of analysis. Depending on grade, concentration and destination market, buyers commonly request the following parameters:
- Assay or concentration as H3PO4.
- P2O5 equivalent where requested by technical specification.
- Appearance, colour, clarity and odour.
- Density or specific gravity at the stated temperature.
- Arsenic, lead and heavy metals according to applicable food-grade limits.
- Fluoride, chloride, sulphate, nitrate or other inorganic impurity limits where specified.
- Iron, calcium, magnesium and other mineral impurities where relevant to the application.
- Residue on ignition or non-volatile residue where specified.
- Food-grade declaration, E338 / INS 338 declaration and compliance statement.
- Packaging type, net weight, pallet configuration and container loading quantity.
- Shelf-life, storage temperature and handling precautions.
- Safety data sheet, transport classification and emergency handling information.
Food grade versus industrial grade
Phosphoric Acid is used in many sectors, including food, beverages, pharmaceuticals, water treatment, detergents, fertilizers, metal treatment and industrial processing. These materials are not automatically interchangeable. Food-grade Phosphoric Acid requires appropriate purity, traceability, impurity control, packaging suitability and documentation for food-manufacturing use.
Food-grade review
- Confirm E338 / INS 338 identity where applicable.
- Review heavy metals and food-grade impurity limits.
- Check supplier food safety and quality system documentation.
- Confirm batch traceability and certificate availability.
- Verify destination-market compliance for the final application.
Industrial-grade warning
- Do not substitute industrial or fertilizer-grade acid for food use.
- Industrial grades may have unsuitable impurity profiles.
- Packaging may not be appropriate for food-grade supply chains.
- Documentation may not satisfy food manufacturer audits.
- Regulatory declarations may be unavailable or insufficient.
Concentration review
- Confirm whether the requested grade is 75%, 80%, 85% or another concentration.
- Recalculate dosage when changing concentration.
- Check freezing, viscosity and handling conditions.
- Verify density for dosing and tank-volume calculations.
- Align concentration with the approved formulation and production records.
Supplier approval points
- Manufacturer or approved supplier identity.
- Food safety certification where available.
- Specification revision control.
- Change-notification process.
- Lead time, sample policy, MOQ and export capability.
Processing and formulation guidance
Phosphoric Acid should be handled as a concentrated corrosive acid and added through controlled, validated dosing systems. For food applications, it is normally diluted or metered into a liquid phase under agitation. Incorrect addition sequence or poor mixing can create local low-pH zones, which may damage sensitive ingredients, destabilise proteins, alter colour or create inconsistent flavour.
- Dilution: when dilution is required, follow site safety procedures and supplier SDS guidance; concentrated acid addition should be controlled to manage heat release and splashing risk.
- Dosing: use calibrated pumps, mass flow meters, pH meters or validated batch-weighing systems to maintain repeatability.
- Mixing: add under sufficient agitation to avoid local over-acidification.
- Beverages: confirm final pH, titratable acidity, flavour balance, preservative performance and carbonation interaction.
- Dairy-style systems: avoid direct concentrated acid contact with proteins; validate addition sequence and dilution.
- Sauces and dressings: monitor pH, emulsion stability, viscosity and flavour after heat treatment and storage.
- Scale-up: confirm that laboratory dosage and pH targets remain stable in production tanks, continuous blending systems and CIP-controlled environments.
pH control, buffering and preservative system review
Phosphoric Acid is often part of a broader acid and preservation strategy. pH reduction can support microbial control, but it should not be treated as a complete preservation system by itself. Final product safety depends on formulation, water activity, preservatives, heat treatment, packaging, storage temperature and validation by the food manufacturer.
pH target
Define the target finished-product pH and acceptable tolerance range before selecting dosage. pH should be measured after full mixing and again after processing and storage if the matrix is complex.
- Use calibrated pH meters.
- Measure at controlled temperature.
- Confirm pH after equilibration.
Titratable acidity
Finished-product sourness and buffering capacity are not always predicted by pH alone. Titratable acidity may be useful for beverages, sauces, confectionery and fermented-style systems.
- Track flavour consistency.
- Compare different acid systems.
- Use product-specific test methods.
Preservative performance
Preservatives such as benzoates or sorbates may depend strongly on pH. Acid selection should be reviewed with the complete preservative system and validated by shelf-life testing.
- Confirm target pH for preservative activity.
- Validate under real packaging and storage conditions.
- Do not rely on pH alone for product safety.
Buffer interaction
Phosphoric Acid can interact with phosphate salts, minerals, proteins and buffers. This may affect final pH drift, mouthfeel, cloud stability or mineral solubility.
- Check mineral compatibility.
- Monitor pH drift during shelf life.
- Evaluate sediment or haze risk.
Equipment, safety and packaging compatibility
Concentrated Phosphoric Acid is corrosive and should be handled using appropriate personal protective equipment, trained personnel and compatible materials. Buyers should review packaging, unloading equipment, storage tanks, transfer pumps, hoses, seals and dosing systems before confirming supply.
- Common packaging may include HDPE drums, food-grade IBCs, bulk tanks or other supplier-approved containers.
- Storage and transfer materials must be compatible with the acid concentration and operating temperature.
- Use closed transfer where possible to reduce splash and exposure risk.
- Ensure local spill-control, eyewash, shower and emergency procedures are available.
- Segregate from incompatible alkalis, reactive materials and non-food chemicals according to the SDS.
- Train operators on corrosive-liquid handling and dilution procedures.
- Verify transport classification, labeling and import rules before shipment.
Quality, compliance and documentation
For international food manufacturers, Phosphoric Acid approval normally requires technical, safety, regulatory and logistics documentation. Global Food Additives can support document collection and supplier communication before purchase and export.
Core documents
- Technical data sheet or product specification.
- Certificate of analysis for the available batch or lot.
- Safety data sheet.
- Manufacturing origin and country-of-origin statement.
- Shelf-life and recommended storage conditions.
- Packaging, net weight and pallet configuration.
Regulatory documents
- Food-grade declaration.
- E338 / INS 338 declaration where applicable.
- Destination-market compliance statement.
- Heavy metal and impurity compliance statement.
- Allergen and GMO statements where required.
- Halal or kosher certificate if required.
Technical documents
- Assay or concentration declaration.
- Density or specific gravity information.
- Impurity limits and analytical method references.
- Batch traceability information.
- Specification revision number.
- Application or handling guidance from the supplier.
Logistics documents
- Commercial invoice and packing list.
- Certificate of origin where required.
- Transport classification and handling labels.
- Container loading plan and pallet dimensions.
- Import permits or market-specific documents if required.
- Emergency contact and transport safety information.
Storage and handling considerations
Food-grade Phosphoric Acid should be stored according to supplier instructions in sealed compatible containers, protected from contamination and unauthorized access. Storage conditions should consider concentration, temperature, ventilation, secondary containment and local chemical-safety rules.
- Keep containers closed when not in use.
- Store away from incompatible materials and non-food chemicals.
- Use secondary containment where required by local rules.
- Protect containers from physical damage, freezing or excessive heat according to supplier guidance.
- Use first-expiry-first-out stock rotation.
- Inspect incoming goods for leakage, swelling, discoloration, contamination or packaging damage.
- Confirm that pumps, hoses and gaskets are suitable for the supplied concentration.
Technical purchasing notes
When reviewing Phosphoric Acid, compare the supplier specification against the intended food application, process conditions, target function, label expectations and destination-market rules. For industrial purchasing, the most useful inquiry normally includes target concentration, food-grade requirement, assay, packaging size, quantity, destination, delivery term and required documents.
Buyers should avoid approving Phosphoric Acid only by product name. A stronger approval process links the exact supplier grade to concentration, impurity limits, packaging format, application, target pH, approved use level, safety handling and regulatory market.
| Information to include | Example details |
|---|---|
| Target concentration | 75%, 80%, 85% or buyer-specific concentration requirement. |
| Application | Carbonated beverage, cola-type drink, beverage concentrate, sauce, dressing, confectionery, dairy-style system or processed food. |
| Target function | pH control, acidulant, acidity regulator, flavour balance, buffering or process standardisation. |
| Quality requirement | Food-grade, E338 / INS 338, buyer specification or destination-market compliance requirement. |
| Packaging preference | HDPE drum, IBC, bulk tank, pail or other compatible food-grade package. |
| Quantity | Sample, trial quantity, drum quantity, IBC quantity, pallet quantity, container quantity or annual contract volume. |
| Destination | Country, port, city, delivery term and import-document requirements. |
| Documents | TDS, specification, COA, SDS, food-grade declaration, E338 statement, heavy metals, allergen, GMO, halal, kosher, origin and shelf-life documents. |
Documents to request
- Product specification or technical data sheet.
- Certificate of analysis for available batch or lot.
- Safety data sheet and transport safety information.
- Food-grade, E338 / INS 338 or regulatory status statement where relevant.
- Assay / concentration declaration and impurity profile.
- Heavy metals, arsenic, lead, fluoride and other impurity statements where required.
- Origin, manufacturer, shelf-life and storage information.
- Allergen, GMO, halal, kosher or vegan statements where required.
- Packaging details, net weight, pallet configuration and container loading information.
- Market-specific declarations required by the destination country.
How to request this product
Send the product name, target concentration, reference specification, intended application, target function, quantity, destination country, packaging preference, expected shipment date and required documents. If you already purchase Phosphoric Acid, attach or describe your existing specification, label, supplier reference or certificate of analysis so supplier options can be compared more accurately.
Useful technical answers
What is Phosphoric Acid used for in food manufacturing?
Phosphoric Acid is used as an acidulant and acidity regulator for pH control, flavour balance, beverage acidulation, buffering, process stability and formulation standardisation. Exact suitability depends on concentration, grade, application, process, regulations and supplier documents.
Is food-grade Phosphoric Acid different from industrial-grade acid?
Yes. Food-grade Phosphoric Acid should meet appropriate purity, traceability, impurity-control and documentation expectations for food manufacturing. Industrial or fertilizer-grade material should not be substituted for food use unless the buyer’s QA and regulatory teams approve the exact grade and documents.
Which concentration should I request?
The correct concentration depends on the approved formulation, dosing system, logistics plan and storage conditions. Common commercial food-grade concentrations include 75%, 80% and 85%, but the buyer should request the exact concentration listed in the approved specification.
Which documents should be requested?
Buyers commonly request a technical data sheet, product specification, certificate of analysis, safety data sheet, food-grade declaration, E338 / INS 338 statement, impurity profile, heavy metal statement, origin statement, allergen statement, GMO statement, shelf-life information, storage conditions, packaging details and market-specific compliance declarations.
Can Global Food Additives source Phosphoric Acid?
Global Food Additives can review sourcing options for food-grade Phosphoric Acid according to target concentration, application, specification, quantity, destination, packaging preference, delivery term and required documentation.
Is this product permitted in every country?
No. Food additive use depends on destination-market rules, food category, use level, label requirements and buyer responsibility. Always confirm local regulatory status before commercial use.
Tell us which Phosphoric Acid grade you need.
Send product name, target concentration, food-grade requirement, application, target function, specification, quantity, destination country, packaging preference, delivery term and document requirements. Our team will review your inquiry and respond from [email protected].
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