Sodium Metabisulfite – Industrial Chemical

Sodium Metabisulfite (SMBS) is a versatile reducing agent that manufacturers use in water treatment, food preservation, textile processing, mining, and chemical production. This white to pale yellow crystalline powder helps remove residual chlorine, control oxidation, and support industrial processing. Its reliable performance and economical handling make it a valuable raw material for many industries. Basekim supplies Sodium Metabisulfite for commercial and industrial buyers seeking consistent quality, suitable grades, and bulk purchasing options.

What Is Sodium Metabisulfite?

Sodium Metabisulfite is an inorganic compound with the molecular formula Na₂S₂O₅ and CAS number 7681-57-4. Chemical suppliers also identify it as sodium pyrosulfite, sodium disulfite, disodium disulfite, and SMBS.

When this chemical dissolves in water, it forms bisulfite species that participate in reduction reactions. These reactions allow manufacturers to neutralize oxidizing agents, limit unwanted oxidation, and support selected chemical processes.

Food processors use approved grades to protect certain products against discoloration and deterioration. Meanwhile, industrial facilities use this reducing agent in water purification, textile production, and chemical manufacturing.

Its broad functionality makes it an economical option for companies that need reliable chemical performance across different operating conditions.

Sodium Metabisulfite Technical Specifications

Industrial buyers should review chemical composition, purity, physical characteristics, and application requirements before choosing a suitable grade.

These figures represent general commercial characteristics. Actual values depend on the manufacturer, product grade, and production batch. Buyers should request a current Certificate of Analysis (COA) and Technical Data Sheet (TDS) before purchasing.

Sodium Metabisulfite Uses and Industrial Applications

Manufacturers choose SMBS because its reducing properties support several important industrial processes. The following applications represent major areas of commercial demand.

1. Water Treatment and Dechlorination

Water treatment facilities use this chemical to neutralize residual chlorine and other oxidizing substances.

Chlorine can damage sensitive filtration equipment, particularly reverse osmosis membranes. Treatment operators therefore add controlled quantities of SMBS before water enters critical membrane systems.

Common applications include:

• Reverse osmosis membrane protection

• Industrial wastewater treatment

• Process water dechlorination

• Residual chlorine removal

• Selected boiler feedwater applications

• Chemical reduction in treatment systems

The compound reacts with free chlorine and converts it into chloride under appropriate treatment conditions.

Operators must calculate dosage according to chlorine concentration, water chemistry, and treatment objectives. Excessive dosing can create unnecessary chemical consumption and affect downstream processes.

2. Food Preservation and Antioxidant Applications

Food manufacturers use approved food-grade sodium pyrosulfite to limit oxidation and maintain the quality of selected products.

Its sulfiting activity helps protect color, reduce certain deterioration reactions, and inhibit some microorganisms under suitable conditions.

Typical applications include:

• Dried fruit processing

• Wine production

• Selected beverage manufacturing

• Certain processed vegetables

• Starch processing

• Approved food ingredient formulations

Food processors must follow the regulations that apply to each product category and destination market.

Manufacturers should also evaluate sulfite labeling requirements because some consumers experience sensitivity to sulfiting agents.

Food-grade material must meet applicable purity and impurity specifications. Industrial-grade chemicals do not automatically qualify for food processing.

3. Textile Manufacturing and Bleaching Processes

Textile producers use SMBS in selected reduction and neutralization operations.

During bleaching, manufacturers sometimes need to remove residual oxidizing agents before continuing with dyeing or finishing.

This reducing chemical helps control those residues and supports consistent processing conditions.

Applications include:

• Neutralization after bleaching

• Residual chlorine removal

• Selected fiber treatment operations

• Chemical reduction processes

• Preparation for certain dyeing procedures

Manufacturers should select appropriate concentrations and treatment conditions according to fabric composition, temperature, and process chemistry.

4. Mining and Mineral Processing

Mining operations use sodium disulfite in selected flotation circuits to influence mineral separation.

Its reducing activity can modify process chemistry and help operators control the flotation behavior of certain sulfide minerals.

Common applications include:

• Copper flotation circuits

• Lead and zinc separation

• Sulfide mineral processing

• Selected flotation reagent systems

• Process water chemistry adjustment

Ore composition, dissolved oxygen, pH, and interactions with other reagents influence performance.

Therefore, mining engineers should conduct laboratory testing before introducing this chemical into full-scale processing operations.

5. Chemical Manufacturing and Industrial Processing

Chemical manufacturers use sulfite-based reducing agents to support various production and purification processes.

These compounds help control oxidation reactions, neutralize certain residual oxidants, and support chemical synthesis.

Industrial applications include:

• Chemical reduction reactions

• Process stabilization

• Preparation of sulfite-based compounds

• Selected purification procedures

• Removal of residual oxidizing chemicals

Companies that require a separate buffering or mild alkalinity-control chemical can also explore Sodium Bicarbonate.

Sodium bicarbonate supports pH adjustment and buffering, while SMBS primarily provides reducing activity. Manufacturers should select each product according to the intended process.

Food Grade vs Industrial Grade SMBS

Food-grade and industrial-grade products contain the same primary compound. However, their quality requirements and intended applications differ.

Purity alone does not determine whether a chemical qualifies for food use.

Two products may offer similar assay values but differ in trace impurities, manufacturing controls, and compliance documentation.

Buyers should review these differences carefully before selecting a grade.

Why Industries Choose Sodium Metabisulfite

Strong Reducing Performance

SMBS reacts with oxidizing agents and supports controlled reduction processes. This property makes it useful in dechlorination and selected industrial chemical operations.

Economical Chemical Treatment

Its reducing capacity helps operators manage treatment costs when they calculate and control dosage correctly.

Versatile Industrial Applications

The compound supports water treatment, food preservation, textile processing, mining, and chemical manufacturing.

Convenient Solid Form

Powder packaging simplifies transportation and inventory management compared with certain liquid chemical alternatives.

However, operators must protect the product against moisture and incompatible materials.

Practical Bulk Procurement

Industrial buyers can purchase commercial quantities and organize shipments according to production requirements, warehouse capacity, and consumption rates.

Sodium Metabisulfite Packaging and Bulk Supply

Proper packaging helps maintain chemical quality during storage, transportation, and international shipping.

Moisture exposure can affect the stability and handling characteristics of SMBS. Therefore, suppliers commonly use protective bags and suitable liners.

Typical packaging arrangements include:

• 25 kg moisture-resistant bags

• Bags with polyethylene liners

• Palletized industrial shipments

• Full-container export orders

• Alternative packaging upon availability

Buyers should confirm packaging materials, labeling, pallet configuration, and container loading arrangements before ordering.

For international shipments, proper handling helps reduce the risk of moisture damage and packaging failure.

Sodium Metabisulfite and Related Industrial Chemicals

Industrial procurement teams often purchase multiple chemicals for different stages of water treatment and manufacturing.

For example, a facility may use a reducing agent to remove chlorine while applying an alkaline chemical in a separate pH-control process.

Buyers who source related chemicals can also explore Sodium Silicate for industrial formulations and alkaline applications.

Sodium silicate and SMBS perform different chemical functions. Engineers should evaluate their compatibility and process requirements before selecting either material.

Sodium Metabisulfite Price and Bulk Purchasing Factors

The price of SMBS depends on product grade, order quantity, packaging, transportation, and market conditions.

Product Grade and Quality

Food-grade material may require stricter impurity limits, additional testing, and specific documentation.

These requirements can influence the final quotation.

Order Volume

Full-container purchases may offer lower transportation costs per metric ton than smaller shipments.

Buyers should compare quotations based on the same delivery conditions and specifications.

Packaging Requirements

Standard bags, specialized liners, palletization, and custom labeling can affect packaging costs.

Shipping Destination

Freight rates, customs procedures, destination charges, and delivery terms influence the total landed cost.

Raw Material and Production Costs

Energy prices, raw material availability, production capacity, and regional demand can affect commercial offers.

Buyers should compare total purchasing costs rather than relying only on the quoted price per ton.

Consistent quality and appropriate active content can help reduce operational problems and unnecessary chemical consumption.

How to Choose a Reliable Sodium Metabisulfite Supplier

Industrial buyers should evaluate suppliers according to product quality, technical documentation, commercial reliability, and delivery capabilities.

Before confirming an order, request the following information:

• Chemical grade and purity

• Certificate of Analysis

• Technical Data Sheet

• Safety Data Sheet

• Country of origin

• Packaging specifications

• Minimum order quantity

• Available shipment volume

• Delivery terms and Incoterms

• Estimated lead time

Buyers should also confirm whether the product meets the technical requirements of their application.

Food manufacturers must verify relevant regulatory compliance, while water treatment operators should review treatment-system requirements and applicable chemical standards.

Storage, Handling, and Safety Precautions

Correct storage and handling help maintain product quality and protect workers.

Keep the chemical in tightly sealed packaging inside a cool, dry, well-ventilated storage area.

Avoid moisture exposure and direct contact with incompatible substances.

Acids can trigger sulfur dioxide release, creating a serious inhalation hazard.

Workers should follow these precautions:

• Avoid inhaling dust.

• Use suitable eye and skin protection.

• Keep bags away from acids and strong oxidizers.

• Protect opened packaging against humidity.

• Maintain adequate ventilation.

• Follow the product-specific Safety Data Sheet.

• Use approved spill-control procedures.

The chemical can cause serious eye damage and other harmful effects following improper exposure.

Facilities should train personnel and maintain suitable handling procedures.

Buy Sodium Metabisulfite in Bulk from Basekim

Basekim supports commercial buyers seeking chemicals for water treatment, manufacturing, and industrial processing.

Companies can contact the sales team to discuss SMBS grades, product specifications, order quantities, packaging, and international shipping requirements.

A successful purchasing process starts with accurate technical information.

Buyers should identify the intended application, required assay, destination, and delivery terms before requesting a quotation.

Request a bulk Sodium Metabisulfite quotation from Basekim and share your technical and commercial requirements to discuss suitable supply options.

Frequently Asked Questions

What is Sodium Metabisulfite used for?

Manufacturers use it for dechlorination, oxidation control, food preservation, textile processing, chemical manufacturing, and selected mining operations.

Is SMBS the same as sodium pyrosulfite?

Yes. Both names refer to the same inorganic compound, Na₂S₂O₅. Chemical suppliers also use the names sodium disulfite and disodium disulfite.

What is the difference between sodium bisulfite and SMBS?

Sodium bisulfite has the chemical formula NaHSO₃, while SMBS has the formula Na₂S₂O₅. Both provide bisulfite species in water, but their molecular weights, physical forms, and dosing requirements differ.

Can SMBS remove chlorine from water?

Yes. It reacts with residual chlorine and supports dechlorination. Treatment operators must calculate the correct dosage and verify residual chlorine levels.

Is this chemical suitable for food processing?

Approved food-grade material can serve as a preservative or antioxidant in permitted applications. Manufacturers must follow relevant food regulations, concentration limits, and labeling requirements.

What does E223 mean?

E223 identifies the compound as a food additive in regulatory systems that use E numbers. Food manufacturers must follow applicable restrictions and permitted-use conditions.

What purity do commercial grades offer?

Common commercial grades provide approximately 97–99% assay, depending on manufacturer specifications. Buyers should verify actual purity through a current COA.

What is the typical packaging for bulk orders?

Suppliers commonly offer 25 kg bags with suitable protective liners. Palletized and containerized shipments support larger commercial orders.

How should SMBS be stored?

Store it in sealed packaging in a cool, dry, well-ventilated area. Keep it away from moisture, acids, and incompatible oxidizing agents.

Where can I buy Sodium Metabisulfite in bulk?

Commercial buyers can contact Basekim to discuss product grades, packaging, quantities, technical documentation, and quotation requirements.