Potassium Hydrogen Sulphite
Potassium Hydrogen Sulphite, also known as Potassium Bisulphite or E228, is a sulphite-based preservative and antioxidant used in selected food and beverage systems for microbial stability, enzymatic browning control, oxygen management and shelf-life support where regulations permit its use.
For industrial buyers, Potassium Hydrogen Sulphite should be evaluated through both a formulation and compliance lens. The most important purchasing questions are the available sulphur dioxide equivalent, assay basis, intended food category, maximum permitted residual level, sulphite declaration requirement, process pH, packaging barrier, storage stability, SDS handling guidance and destination-market documentation.
Product identity
| Product name | Potassium Hydrogen Sulphite |
|---|---|
| Common names | Potassium Bisulphite, Potassium Bisulfite, Potassium Hydrogen Sulfite |
| Category | Preservatives & Antimicrobials |
| Function | Preservative, antioxidant, antimicrobial shelf-life support and sulphur dioxide source where permitted |
| E / INS number | E228 / INS 228 |
| CAS / identity | 7773-03-7 |
| Chemical formula | KHSO3 |
| Approximate molecular weight | 120.16 g/mol |
| Functional basis | Usually specified by sulphite content or available sulphur dioxide equivalent |
| Typical physical form | Powder, crystalline powder, granule or aqueous solution depending on supplier and specification |
| Typical sensory note | May have sulphurous odour; supplier specification and finished-product trials should confirm suitability |
| Handling focus | Protection from air, moisture, heat, acids, oxidizing materials and uncontrolled sulphur dioxide release |
Application fit
Potential use areas may include the following when permitted by local food law, product category and finished-product residue limits:
- Wine, cider and fermented beverage processing
- Fruit preparations, fruit fillings, pulps, purees and syrups
- Dried fruit systems and colour-retention applications
- Vegetable processing and selected brined products
- Sauces, dressings, condiments and acidified systems
- Juice concentrates, beverage bases and sugar syrups
- Starch, potato and plant-based processing where permitted
- Antioxidant support in oxygen-sensitive food matrices
Technical purchasing notes
When reviewing Potassium Hydrogen Sulphite, compare the supplier specification against the intended food application, pH range, process temperature, oxygen exposure, target microbial control, colour-protection requirement, residual SO2 target, allergen declaration obligation, label expectations and local rules. The most useful inquiry normally includes target grade, assay, available SO2 equivalent, solid or liquid form, packaging size, quantity, destination country, application and document requirements.
Sulphite performance is highly matrix-dependent. The preservative effect is influenced by product pH, dissolved oxygen, sugar content, water activity, microbial load, metal ions, enzyme activity, packaging oxygen transmission and storage temperature. For this reason, buyers should not rely only on theoretical dosage. Pilot trials, residual SO2 analysis, sensory evaluation and finished-product shelf-life testing are usually required before commercial approval.
Industrial formulation considerations
SO2 equivalent and dosage control
Potassium Hydrogen Sulphite is normally evaluated by its ability to contribute sulphite activity or sulphur dioxide equivalent. Formulators should define the permitted addition rate, expected binding losses, target free SO2 where relevant, total SO2 limit, final residual level and label declaration requirement.
- Confirm whether the specification is expressed as KHSO3, sulphite, bisulphite or SO2 equivalent.
- Use validated weighing, metering or dilution procedures to prevent over-dosing.
- Measure residual SO2 in the finished product rather than relying only on input calculation.
- Account for binding to sugars, aldehydes, pigments, phenolics and other matrix components.
- Maintain batch records showing addition rate, lot number, application point and analytical release data.
pH, microbiology and antioxidant performance
Sulphite antimicrobial activity is generally stronger in acidic systems because molecular sulphur dioxide becomes more available at lower pH. It can also help limit oxidative browning and flavour deterioration, but efficacy depends on matrix chemistry and oxygen exposure.
- Define the pH range before selecting a sulphite-based preservative system.
- Validate performance against yeast, mould and target spoilage organisms in the actual product.
- Assess colour, aroma and flavour impact during shelf-life testing.
- Review compatibility with ascorbic acid, enzymes, colours, metals and packaging oxygen barrier.
- Use hurdle preservation design rather than relying on sulphite alone where microbial risk is high.
Specification parameters to compare
| Parameter | Why it matters for food manufacturers |
|---|---|
| Assay / active content | Confirms the active ingredient basis used for dosage, cost-in-use comparison and batch release. |
| Available SO2 equivalent | Critical for calculating preservative strength, residual limits and sulphite declaration requirements. |
| Identity testing | Verifies that the supplied material matches the declared potassium hydrogen sulphite identity and is not another sulphite salt. |
| pH of solution | Supports compatibility review for beverage, fruit, sauce and acidified-food systems. |
| Insoluble matter | Important for liquid systems, clear beverages, syrups, brines and filtration-sensitive products. |
| Heavy metals / elemental impurities | Required for food safety review, customer specifications and destination-market compliance. |
| Appearance and odour | May indicate oxidation, contamination, storage damage or suitability issues for sensitive applications. |
| Particle size / physical form | Affects dusting, dissolution, dosing accuracy, segregation risk and operator exposure. |
| Liquid concentration | For solution grade, concentration determines dosing pump calibration, transport economics and shelf-life planning. |
| Packaging barrier | Protects against air, moisture, oxidation, leakage and loss of active sulphite during transport and storage. |
| Shelf life and storage conditions | Supports inventory planning and helps avoid potency loss, oxidation, caking or concentration drift. |
Food manufacturing applications
Wine, cider and fermented beverages
Potassium Hydrogen Sulphite may be considered for microbial control and oxidation management in wine-style and fermented beverage systems where permitted. Application review should include free SO2, total SO2, pH, dissolved oxygen, microbial status, sensory profile, packaging format and destination-market labelling.
Fruit preparations and syrups
In fruit pulps, purees, fillings and syrups, sulphites may help control enzymatic browning, colour loss and spoilage organisms. Formulators should evaluate fruit pH, sugar concentration, enzyme activity, heat treatment, residual SO2, colour retention and taste impact.
Dried fruit and vegetable systems
Sulphite preservatives are often discussed for dried products because colour retention and oxidative protection are important. Buyers must confirm whether the target product category permits sulphites and whether final residue levels trigger allergen or sensitivity-related declarations.
Sauces, dressings and condiments
Acidified sauces and condiment systems may use sulphite-based preservation where allowed. Formulation review should include pH, vinegar or organic acid system, sugar, salt, water activity, headspace oxygen, packaging barrier, sulphite binding and flavour compatibility.
Juice concentrates and beverage bases
For concentrates and beverage bases, Potassium Hydrogen Sulphite can be evaluated for antioxidant support and microbial stability. Finished-product trials should check clarity, colour, aroma, taste, residual SO2 and compatibility with vitamins, flavours and colour systems.
Starch, potato and plant processing
In some plant-based processing routes, sulphites may be discussed for browning control and process protection. The application should define contact time, washing or removal step, residual level, wastewater handling and whether the material is treated as an additive or processing aid.
Process engineering and plant handling
Industrial use of Potassium Hydrogen Sulphite requires a controlled plant-handling plan. Solid grades may dust and lose activity if exposed to air or moisture, while liquid grades require concentration control, compatible storage and metering equipment. Sulphites can release sulphur dioxide under acidic conditions, so production areas should review ventilation, PPE, SDS requirements, spill response, emergency procedures and storage segregation.
- Store in tightly closed original packaging away from acids, oxidizers, heat and moisture.
- Use controlled transfer and local ventilation where dust or sulphur dioxide odour may occur.
- Avoid mixing directly with acids unless the process and safety controls are designed for SO2 release.
- Calibrate dosing systems according to active content or SO2 equivalent, not only gross material weight.
- Use compatible pumps, seals, hoses and tanks for solution grades.
- Include sulphite handling in allergen or sensitivity control programs where required by the buyer’s food-safety system.
- Document cleaning, changeover and line-clearance procedures when using sulphite-containing materials.
Quality, safety and compliance checklist
- Confirm food-grade status and the exact standard referenced by the supplier.
- Request assay, SO2 equivalent, pH, insoluble matter, appearance, odour and heavy metal limits.
- Verify whether the offered material is solid grade, solution grade or a customer-specific dilution.
- Confirm permitted use and maximum level for the target food category in the destination market.
- Check sulphite declaration rules, including thresholds expressed as sulphur dioxide equivalent.
- Review the SDS for sulphur dioxide release, respiratory exposure, PPE, first-aid and storage incompatibilities.
- Validate residual SO2 testing in the finished product or process stream.
- Assess sensory impact, especially sulphurous odour, flavour changes and colour effects.
- Verify lot traceability from manufacturer to exporter, including batch number, production date and expiry or retest date.
- Request allergen, GMO, vegan, halal, kosher and irradiation statements when required by the buyer or destination market.
- Do not approve label claims, preservative claims or processing-aid status without local regulatory review.
Documents to request
- Product specification or technical data sheet
- Certificate of analysis for the offered batch or lot
- Safety data sheet with sulphite and sulphur dioxide handling information
- Food-grade declaration and intended-use statement
- Country of origin, manufacturer statement and lot traceability declaration
- Shelf-life, retest period and storage-condition statement
- Available SO2 equivalent or sulphite-content declaration
- Heavy metals, elemental impurities and contaminant declaration
- Allergen or sulphite declaration statement for the destination market
- Allergen, GMO, vegan, halal, kosher and irradiation statements when required
- Packaging specification, net weight, pallet pattern and container-loading information
- Market-specific declarations required by the destination country or buyer quality system
- Transport classification and dangerous-goods documentation where applicable
Packaging, handling and storage
Potassium Hydrogen Sulphite should be stored in tightly closed, compatible packaging away from humidity, heat, acids, oxidizing agents and direct sunlight. Exposure to air and moisture can reduce active sulphite content, affect odour and compromise dosing accuracy. Opened containers should be resealed quickly, labelled clearly and used under FIFO or FEFO inventory control.
For export shipments, buyers should confirm net weight, packaging type, liner or drum specification, seal integrity, pallet configuration, label language, batch marking, container-loading details, temperature exposure and whether the receiving warehouse can store sulphite materials separately from acids and oxidizers. For solution grades, confirm concentration stability, leakage protection, container compatibility and unloading method before shipment.
Quotation and sourcing variables
| Inquiry item | Information to provide |
|---|---|
| Target grade | Food grade, E228 / INS 228, customer specification or other required standard. |
| Physical form | Powder, crystalline powder, granule or aqueous solution. |
| Assay / SO2 basis | Required active content, sulphite basis or sulphur dioxide equivalent. |
| Application | Wine, beverage, dried fruit, fruit preparation, sauce, vegetable processing, starch processing or other use. |
| Residue target | Maximum final SO2 level, free SO2 target where relevant and declaration threshold to be managed. |
| Quantity | Trial quantity, first commercial order, annual demand and shipment frequency. |
| Destination | Country, port, delivery address, Incoterms preference and import documentation requirements. |
| Packaging | Bag, drum, IBC, liner, net weight, pallet requirement and container-loading preference. |
| Documentation | COA, TDS, SDS, food-grade declaration, origin, shelf life, sulphite declaration, allergen/GMO/halal/kosher statements and transport documents. |
How to request this product
Send the product name, target grade or reference specification, required assay or SO2 equivalent, physical form, intended application, expected final residual limit, quantity, destination country, preferred packaging, delivery term, expected shipment date and documentation checklist. If you already purchase Potassium Hydrogen Sulphite, attach your current specification, certificate of analysis, SDS or process requirement so available supplier options can be compared more accurately.
Useful answers
What is Potassium Hydrogen Sulphite used for in food manufacturing?
Potassium Hydrogen Sulphite is used as a sulphite preservative and antioxidant for microbial stability, yeast and mould inhibition, enzymatic browning control, oxygen management and shelf-life support in permitted food and beverage applications.
Is Potassium Hydrogen Sulphite the same as Potassium Bisulphite?
Yes. Potassium Hydrogen Sulphite is commonly referred to as Potassium Bisulphite or Potassium Bisulfite. It is normally evaluated as a sulphite source that can contribute sulphur dioxide activity in food systems.
What is the E number for Potassium Hydrogen Sulphite?
Potassium Hydrogen Sulphite is commonly identified as E228 or INS 228. Buyers should confirm permitted use, food category restrictions, maximum levels, residual SO2 limits and label requirements in the destination market.
Why is pH important for sulphite preservatives?
Sulphite antimicrobial activity is strongly affected by pH. Acidic systems generally provide stronger sulphur dioxide activity, while higher-pH systems may require different preservation strategies or additional hurdles.
Why is sulphite declaration important?
Sulphites are sensitivity-related additives in many markets. Finished products may require clear declaration when sulphur dioxide or sulphite residues exceed market-specific thresholds, so buyers must confirm local rules before label approval.
Can Global Food Additives source Potassium Hydrogen Sulphite?
Global Food Additives can review sourcing options according to target specification, food-grade requirement, assay or SO2 equivalent, quantity, destination, packaging preference and documentation needs.
Which documents should be requested?
Buyers commonly request a technical data sheet, certificate of analysis, safety data sheet, food-grade declaration, SO2 equivalent statement, origin statement, shelf-life statement, storage conditions, packaging details, traceability information and market-specific declarations.
Is this product permitted in every country?
No. Food additive use, processing-aid status, maximum SO2 levels, residual limits and labelling depend on destination-market rules, food category, use level, finished-product residue and buyer responsibility.
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