For procurement managers and chemical engineers sourcing bulk reducing agents, a thorough understanding of the properties of sodium metabisulfite is the foundation of successful formulation, safe handling, and cost-effective supply chain management. From water dechlorination at municipal treatment plants to cyanide detoxification in gold mines and sulfite preservation in food processing, this versatile inorganic compound delivers reliable performance only when its chemical and physical characteristics align with end-use requirements.
At Weifang Hailei Fine Chemical Co., Ltd., we supply sodium metabisulfite (Na₂S₂O₅, CAS 7681-57-4) in both food-grade (FCC compliant) and industrial-grade (97–98% purity) to buyers across India, Southeast Asia, Africa, and the Middle East. This guide decodes every property you need to evaluate before issuing a purchase order, helping you avoid caking in storage, insufficient SO₂ release, or regulatory non-compliance.
Understanding what is sodium metabisulfite made from clarifies its inherent properties. Industrially, sodium metabisulfite is produced by saturating a sodium carbonate or sodium hydroxide solution with sulfur dioxide (SO₂). The exothermic reaction first forms sodium bisulfite (NaHSO₃) in solution, which is then carefully dehydrated through cooling and controlled crystallization to yield solid sodium metabisulfite:
2 NaHSO₃(aq) → Na₂S₂O₅(s) + H₂O
The product is a white to yellowish crystalline powder or granular material with a pungent SO₂ odor. Because its synthesis relies on high-purity SO₂ gas and a low-iron process environment, the quality of inputs directly determines the final product’s heavy metal profile and clarity in solution. For food-grade material, additional purification steps ensure compliance with FCC or E223 monographs, making it safe for use as a preservative in dried fruits, wines, and starch syrups.
A technical evaluation begins with the core properties of sodium metabisulfite. These data points influence dissolution rates, dosing precision, and compatibility with other process chemicals.
These parameters are not just laboratory curiosities—they directly affect real-world outcomes. For instance, the acidic pH of a metabisulfite solution makes it ideal for acidifying and preserving high-sugar food systems, while the decomposition temperature dictates safe storage away from heat sources.
Sodium metabisulfite is traded primarily in two purity specifications: industrial grade (typically 97–98% Na₂S₂O₅) and food grade (≥98% plus strict limits on iron, arsenic, and heavy metals). The property differences may seem subtle, but they have outsized impacts in sensitive applications.
Industrial grade (97–98%): Optimized for water treatment, gold mining (cyanide destruction), and pulp & paper bleaching. A lower assay of 97% still supplies more than 65% equivalent SO₂ content, but the 1–2% inert salts or sulfate residues can affect clarity in closed-loop water systems. Buyers should monitor iron content (<0.003% typical), since dissolved iron can catalyze unwanted oxidation or stain pulp.
Food grade (FCC/E223): Must meet purity thresholds for arsenic (≤3 mg/kg), lead (≤2 mg/kg), and selenium. The absence of chloride by-products ensures no off-flavors in wine or dried fruit. At Hailei Chemical, our food-grade sodium metabisulfite is manufactured under rigorous HACCP-guided protocols to guarantee compliance with international food safety standards.
When specifying your purchase, always request a Certificate of Analysis (COA) detailing assay, SO₂ content, pH of 10% solution, iron, heavy metals, and water-insoluble matter. The sodium metabisulfite product page provides typical Hailei COA ranges to simplify your comparison.
Many industrial buyers wonder about the interchangeability of sodium bisulfite and sodium metabisulfite. While both provide SO₂ in solution, their chemical properties lead to different dosing behaviors and storage considerations.
| Property | Sodium Metabisulfite (Na₂S₂O₅) | Sodium Bisulfite (NaHSO₃) |
|---|---|---|
| Physical form | Dry crystalline powder/granules | Often supplied as solution (approx. 40%) or crystalline solid (less stable) |
| SO₂ equivalent | Approx. 65–67% by weight | Approx. 22–24% in commercial solutions; solid bisulfite contains 60–65% but is hygroscopic |
| pH of solution | 4.0–5.5 (10% solution) | 2.5–4.0 (solution), more acidic |
| Stability in storage | Excellent when kept dry; >12 months shelf life | Solution prone to oxidation by air; solid form absorbs moisture rapidly |
| Shipping | Dry bulk; cost-effective long-distance shipping | Solution requires tankers or IBCs; higher freight per active SO₂ |
| Typical applications | Water dechlorination, gold mining, food preservative, pulp bleaching, textile | On-site chlorine neutralization, reducing agent in chemical synthesis, leather tanning |
The choice often boils down to logistics and pH buffering. For intercontinental shipments where freight cost and product stability matter, dry sodium metabisulfite is the preferred form. Upon dissolution in water, it forms sodium bisulfite ions, delivering the same reducing action. However, if your process demands immediate solution without handling dry powder, a pre-made bisulfite solution might be convenient—though it costs more per kilogram of SO₂ delivered. Hailei supplies both dry sodium metabisulfite and can direct you to logistics partners for sodium bisulfite solutions where needed.
Knowing how to use sodium metabisulphite safely and efficiently starts with respecting its reactivity profile. The compound’s core property is its ability to release sulfur dioxide in acidic conditions or when heated, making it a potent oxygen scavenger and antimicrobial agent.
In municipal and industrial water treatment, sodium metabisulfite instantly neutralizes free chlorine and chloramines. The stoichiometric reaction requires 1.34 parts of pure Na₂S₂O₅ per part of chlorine. A typical dosing rate is 2–3 mg/L of a 10% metabisulfite solution per mg/L residual chlorine, adjusted for mixing efficiency. Because the reaction drops pH slightly, systems with low alkalinity may need buffering.
The SO₂/air process (INCO method) uses metabisulfite as the SO₂ source to oxidize cyanides (CN⁻) to cyanate (OCN⁻), catalyzed by copper. The reducing property here must be carefully controlled: a solution pH between 8.5 and 9.5 optimizes cyanide destruction while minimizing off-gassing of HCN. Miners often dose metabisulfite at 2–4 grams per gram of WAD cyanide.
As an E223 additive, sodium metabisulfite inhibits enzymatic and non-enzymatic browning in dried fruits, frozen seafood, and wine. The effective SO₂ concentration for antimicrobial action is 50–400 ppm, depending on the product. Its ability to lower pH helps stabilize ascorbic acid and color. Importantly, residual sulfite must meet local labeling laws—typically <10 ppm SO₂ in final product.
In mechanical pulping, metabisulfite acts as a reducing bleach to brighten lignin-rich pulps without degrading cellulose. The property of preserving fiber strength while increasing brightness by 5–8 ISO points makes it valuable for newsprint and tissue grades. Typical application: 1–3% on oven-dry pulp at pH 5–6.
After chlorine bleaching, fabrics carry residual chlorine that can yellow or weaken fibers. A 0.5–2 g/L sodium metabisulfite bath, based on its rapid dechlorination property, eliminates this risk. The slightly acidic pH helps close fiber cuticles, improving dye uptake in subsequent steps.
For detailed application recipes and custom formulation support, refer to our comprehensive sodium metabisulfite application guide.
Procuring sodium metabisulfite without verifying properties against recognized standards can lead to inconsistent batch performance, rejected shipments, or even plant shutdowns. A rigorous supplier evaluation framework should include the following analytical benchmarks.
Request a batch-specific COA with every shipment. Third-party testing by SGS, Bureau Veritas, or Intertek adds an extra layer of trust. Hailei Chemical routinely arranges pre-shipment inspections against these parameters to ensure that the properties of sodium metabisulfite you order are exactly what you receive.
The shelf life and performance of sodium metabisulfite depend critically on storage conditions. Exposure to moisture and heat degrades its reducing power and turns the powder into a hard, unworkable mass.
Key recommendations:
Understanding these environmental sensitivities allows you to plan inventory turnover and avoid waste, directly protecting your investment in each purchased ton.
India is one of the world’s largest importers of sodium metabisulfite, driven by expansive water treatment programs, a massive gold import sector, and a growing food processing industry. If you are seeking a sodium metabisulfite supplier in India, working directly with a chemical exporter in China can often offer cost advantages of 12–18% compared to local distributors, provided you manage shipping and quality inspection efficiently.
Hailei Chemical serves Indian buyers through Nhava Sheva, Mundra, Chennai, and Kolkata ports. Our typical packaging in 25 kg HDPE bags with inner liner is palletized and shrink-wrapped for tropical climates. We also offer 1000–1250 kg big bags and custom private labeling. For oil & gas or mining tenders, we provide full documentation: COA, MSDS, Certificate of Origin, and fumigation certificates as required by Indian customs (HS Code 28321010).
The same logistics expertise applies to buyers in the Middle East (Jebel Ali, Dammam), Southeast Asia, and Africa. Our in-house team coordinates FCL and LCL shipments, transit times, and demurrage avoidance. By consolidating volumes, we help you optimize landed costs without compromising the high purity and consistent properties of sodium metabisulfite you require.
Since 2005, Weifang Hailei Fine Chemical Co., Ltd. has been manufacturing and exporting sulfur-based chemicals under strict ISO 9001 and industry-specific certifications. Our sodium metabisulfite is produced in a dedicated facility with advanced crystallization controls, ensuring every batch meets the precise physical and chemical properties detailed in this guide. We maintain ready stock in our warehouse, enabling 7–15 day lead times for standard FCL orders.
When you partner with Hailei, you gain:
Don’t leave your procurement to chance. If you need a reliable supply of sodium metabisulfite that matches the property specifications critical to your operation, request a quote today. Visit our sodium metabisulfite product page to download the latest COA, MSDS, and application brochures, and let us customize a shipment that meets your exact volume and grading needs.
Understanding sodium metabisulfite price in China is critical for procurement managers, chemical engineers, and industrial buyers who rely on this versatile compound for water treatment, gold mining, food preservation, and pulp bleaching. As the world’s largest producer and exporter of sodium metabisulfite (SMBS), China plays a pivotal role in setting global benchmark prices. However, raw material costs, energy fluctuations, environmental regulations, and logistical challenges can cause significant price volatility. This comprehensive guide breaks down the factors influencing sodium metabisulfite price in China, offers practical tips for evaluating supplier quotes, and shows how to secure the best value without compromising on quality or compliance. By the end, you’ll have a clear framework for making cost-effective procurement decisions in 2025.
Sodium metabisulfite (Na2S2O5) is an inorganic compound produced primarily from two inexpensive raw materials: sulfur and sodium carbonate (soda ash). The process begins with burning sulfur to generate sulfur dioxide (SO2), which is then reacted with a sodium carbonate solution to form sodium sulfite. Further reaction with additional SO2 yields sodium metabisulfite, which is crystallized, dried, and packaged. This production route directly links SMBS prices to the costs of sulfur, soda ash, energy, and labor. Because sulfur is a byproduct of petroleum refining and natural gas processing, its price often correlates with crude oil markets. Similarly, soda ash pricing is influenced by global glass and detergent demand. Understanding these relationships helps buyers anticipate shifts in sodium metabisulfite price in China.
Manufacturers in China benefit from integrated production chains. Companies like Weifang Hailei Fine Chemical Co., Ltd. optimize yield and purity through advanced process control, ensuring consistent 97–98% purity for industrial and food-grade products. When you source from a premium sodium metabisulfite supplier in China, you gain access to production efficiencies that can mitigate raw material volatility—often resulting in more stable long-term contract pricing.
The properties of sodium metabisulfite directly influence its usability, storage requirements, and cost across different industries. SMBS is a white to yellowish crystalline powder with a pungent sulfur dioxide odor. Its key characteristics include:
These inherent properties of sodium metabisulfite mean that higher purity grades (98%+ with minimal iron and heavy metals) command a higher market price. When evaluating the sodium metabisulfite price in China, always confirm the chemical’s property specifications through a Certificate of Analysis (CoA) rather than relying solely on nominal purity.
To understand why sodium metabisulfite uses are so varied, it helps to look at the main consumption sectors. Each industry segment has distinct quality requirements and purchase volumes, which collectively influence market price trends. The primary sodium metabisulfite uses include:
Because demand from these sectors overlaps, any supply disruption—such as plant maintenance shutdowns in China’s Shandong province—can rapidly tighten the market and push up the sodium metabisulfite price in China. Diversifying your sourcing strategy and maintaining a qualified second supplier can be a valuable risk management tool.
When negotiating with Chinese manufacturers, it’s essential to look beyond the per-ton FOB or CIF price. The total landed cost includes raw materials, processing, packaging, logistics, and compliance overhead. Here are the five most influential factors shaping sodium metabisulfite price in China this year:
Seasonal variations also play a role. Demand for water treatment chemicals often rises in spring and summer, coinciding with increased water usage and maintenance shutdowns at municipal plants. This seasonal bump can temporarily lift the sodium metabisulfite price in China by 5–8%, making forward contracting a more attractive option for regular buyers.
A low quoted FOB price may hide risks such as inconsistent purity, inadequate packaging, or non-compliance with international standards. When evaluating the sodium metabisulfite price in China, consider these supplier evaluation criteria:
When you partner with an established producer like Weifang Hailei Fine Chemical, you gain more than a product—you get technical support, transparent pricing, and assistance with import regulations. This reduces your total cost of ownership, even if the unit price is marginally higher than a no-name supplier.
A frequently overlooked aspect that affects cost efficiency is sodium metabisulfite solution preparation. Improper mixing can lead to under-utilization of the chemical, requiring higher dosing and effectively increasing your cost per cubic meter of treated water or per ton of ore treated. Here is a reliable protocol for preparing a 10% w/v SMBS solution:
For gold mining operations that rely on precise cyanide destruction, on-site solution preparation using automated dosing systems can improve safety and halve chemical consumption. If you’re sourcing SMBS regularly, confirm that your supplier provides granularity options (powder vs. fine granular) that suit your mixing equipment. Our food and industrial grade sodium metabisulfite is available in multiple particle sizes to optimize dissolution rates and minimize dusting—enhancing both workplace safety and cost efficiency.
Armed with market knowledge, you can negotiate from a position of strength. Here are tactics that professional buyers use:
Always request a formal proforma invoice that itemizes product cost, packaging, freight, insurance, and any certificate fees. This transparency helps you compare quotes on an apples-to-apples basis and ensures that the sodium metabisulfite price in China you agree upon covers everything you need.
The sodium metabisulfite market in China is expected to remain balanced to slightly tight through early 2026. Several dynamics support this outlook:
Savvy buyers can turn these challenges into advantages by forming strategic partnerships now, before a capacity squeeze materializes. Locking in a supplier with strong environmental compliance also future-proofs your supply chain against regulatory non-compliance risks.
The sodium metabisulfite price in China is influenced by a complex interplay of raw materials, energy costs, quality requirements, and global demand. By understanding what sodium metabisulfite is made from, matching its properties and uses to your specific application, and correctly preparing SMBS solutions, you optimize both chemical efficiency and procurement spend. More importantly, evaluating suppliers based on total value rather than just quote price ensures consistent quality and supply security—two factors that outweigh a small per-ton saving.
Whether you need food-grade SMBS for wine preservation, industrial grade for municipal water dechlorination, or high-purity material for gold cyanide destruction, the key is to work with a manufacturer that combines scale, technical expertise, and export experience. At Weifang Hailei Fine Chemical, we produce sodium metabisulfite to international standards and offer transparent pricing that reflects real market conditions, not hidden fees.
Ready to secure a competitive quote and build a reliable supply chain for your sodium metabisulfite needs? Explore our full range of food and industrial grade sodium metabisulfite and request a customized quote today. We’re here to help you navigate the market and lock in the right price for your business.
For procurement managers and chemical engineers sourcing bulk reducing agents, a thorough understanding of the properties of sodium metabisulfite is the foundation of successful formulation, safe handling, and cost-effective supply chain management. From water dechlorination at municipal treatment plants to cyanide detoxification in gold mines and sulfite preservation in food processing, this versatile inorganic compound delivers reliable performance only when its chemical and physical characteristics align with end-use requirements.
At Weifang Hailei Fine Chemical Co., Ltd., we supply sodium metabisulfite (Na₂S₂O₅, CAS 7681-57-4) in both food-grade (FCC compliant) and industrial-grade (97–98% purity) to buyers across India, Southeast Asia, Africa, and the Middle East. This guide decodes every property you need to evaluate before issuing a purchase order, helping you avoid caking in storage, insufficient SO₂ release, or regulatory non-compliance.
Understanding what is sodium metabisulfite made from clarifies its inherent properties. Industrially, sodium metabisulfite is produced by saturating a sodium carbonate or sodium hydroxide solution with sulfur dioxide (SO₂). The exothermic reaction first forms sodium bisulfite (NaHSO₃) in solution, which is then carefully dehydrated through cooling and controlled crystallization to yield solid sodium metabisulfite:
2 NaHSO₃(aq) → Na₂S₂O₅(s) + H₂O
The product is a white to yellowish crystalline powder or granular material with a pungent SO₂ odor. Because its synthesis relies on high-purity SO₂ gas and a low-iron process environment, the quality of inputs directly determines the final product’s heavy metal profile and clarity in solution. For food-grade material, additional purification steps ensure compliance with FCC or E223 monographs, making it safe for use as a preservative in dried fruits, wines, and starch syrups.
A technical evaluation begins with the core properties of sodium metabisulfite. These data points influence dissolution rates, dosing precision, and compatibility with other process chemicals.
These parameters are not just laboratory curiosities—they directly affect real-world outcomes. For instance, the acidic pH of a metabisulfite solution makes it ideal for acidifying and preserving high-sugar food systems, while the decomposition temperature dictates safe storage away from heat sources.
Sodium metabisulfite is traded primarily in two purity specifications: industrial grade (typically 97–98% Na₂S₂O₅) and food grade (≥98% plus strict limits on iron, arsenic, and heavy metals). The property differences may seem subtle, but they have outsized impacts in sensitive applications.
Industrial grade (97–98%): Optimized for water treatment, gold mining (cyanide destruction), and pulp & paper bleaching. A lower assay of 97% still supplies more than 65% equivalent SO₂ content, but the 1–2% inert salts or sulfate residues can affect clarity in closed-loop water systems. Buyers should monitor iron content (<0.003% typical), since dissolved iron can catalyze unwanted oxidation or stain pulp.
Food grade (FCC/E223): Must meet purity thresholds for arsenic (≤3 mg/kg), lead (≤2 mg/kg), and selenium. The absence of chloride by-products ensures no off-flavors in wine or dried fruit. At Hailei Chemical, our food-grade sodium metabisulfite is manufactured under rigorous HACCP-guided protocols to guarantee compliance with international food safety standards.
When specifying your purchase, always request a Certificate of Analysis (COA) detailing assay, SO₂ content, pH of 10% solution, iron, heavy metals, and water-insoluble matter. The sodium metabisulfite product page provides typical Hailei COA ranges to simplify your comparison.
Many industrial buyers wonder about the interchangeability of sodium bisulfite and sodium metabisulfite. While both provide SO₂ in solution, their chemical properties lead to different dosing behaviors and storage considerations.
| Property | Sodium Metabisulfite (Na₂S₂O₅) | Sodium Bisulfite (NaHSO₃) |
|---|---|---|
| Physical form | Dry crystalline powder/granules | Often supplied as solution (approx. 40%) or crystalline solid (less stable) |
| SO₂ equivalent | Approx. 65–67% by weight | Approx. 22–24% in commercial solutions; solid bisulfite contains 60–65% but is hygroscopic |
| pH of solution | 4.0–5.5 (10% solution) | 2.5–4.0 (solution), more acidic |
| Stability in storage | Excellent when kept dry; >12 months shelf life | Solution prone to oxidation by air; solid form absorbs moisture rapidly |
| Shipping | Dry bulk; cost-effective long-distance shipping | Solution requires tankers or IBCs; higher freight per active SO₂ |
| Typical applications | Water dechlorination, gold mining, food preservative, pulp bleaching, textile | On-site chlorine neutralization, reducing agent in chemical synthesis, leather tanning |
The choice often boils down to logistics and pH buffering. For intercontinental shipments where freight cost and product stability matter, dry sodium metabisulfite is the preferred form. Upon dissolution in water, it forms sodium bisulfite ions, delivering the same reducing action. However, if your process demands immediate solution without handling dry powder, a pre-made bisulfite solution might be convenient—though it costs more per kilogram of SO₂ delivered. Hailei supplies both dry sodium metabisulfite and can direct you to logistics partners for sodium bisulfite solutions where needed.
Knowing how to use sodium metabisulphite safely and efficiently starts with respecting its reactivity profile. The compound’s core property is its ability to release sulfur dioxide in acidic conditions or when heated, making it a potent oxygen scavenger and antimicrobial agent.
In municipal and industrial water treatment, sodium metabisulfite instantly neutralizes free chlorine and chloramines. The stoichiometric reaction requires 1.34 parts of pure Na₂S₂O₅ per part of chlorine. A typical dosing rate is 2–3 mg/L of a 10% metabisulfite solution per mg/L residual chlorine, adjusted for mixing efficiency. Because the reaction drops pH slightly, systems with low alkalinity may need buffering.
The SO₂/air process (INCO method) uses metabisulfite as the SO₂ source to oxidize cyanides (CN⁻) to cyanate (OCN⁻), catalyzed by copper. The reducing property here must be carefully controlled: a solution pH between 8.5 and 9.5 optimizes cyanide destruction while minimizing off-gassing of HCN. Miners often dose metabisulfite at 2–4 grams per gram of WAD cyanide.
As an E223 additive, sodium metabisulfite inhibits enzymatic and non-enzymatic browning in dried fruits, frozen seafood, and wine. The effective SO₂ concentration for antimicrobial action is 50–400 ppm, depending on the product. Its ability to lower pH helps stabilize ascorbic acid and color. Importantly, residual sulfite must meet local labeling laws—typically <10 ppm SO₂ in final product.
In mechanical pulping, metabisulfite acts as a reducing bleach to brighten lignin-rich pulps without degrading cellulose. The property of preserving fiber strength while increasing brightness by 5–8 ISO points makes it valuable for newsprint and tissue grades. Typical application: 1–3% on oven-dry pulp at pH 5–6.
After chlorine bleaching, fabrics carry residual chlorine that can yellow or weaken fibers. A 0.5–2 g/L sodium metabisulfite bath, based on its rapid dechlorination property, eliminates this risk. The slightly acidic pH helps close fiber cuticles, improving dye uptake in subsequent steps.
For detailed application recipes and custom formulation support, refer to our comprehensive sodium metabisulfite application guide.
Procuring sodium metabisulfite without verifying properties against recognized standards can lead to inconsistent batch performance, rejected shipments, or even plant shutdowns. A rigorous supplier evaluation framework should include the following analytical benchmarks.
Request a batch-specific COA with every shipment. Third-party testing by SGS, Bureau Veritas, or Intertek adds an extra layer of trust. Hailei Chemical routinely arranges pre-shipment inspections against these parameters to ensure that the properties of sodium metabisulfite you order are exactly what you receive.
The shelf life and performance of sodium metabisulfite depend critically on storage conditions. Exposure to moisture and heat degrades its reducing power and turns the powder into a hard, unworkable mass.
Key recommendations:
Understanding these environmental sensitivities allows you to plan inventory turnover and avoid waste, directly protecting your investment in each purchased ton.
India is one of the world’s largest importers of sodium metabisulfite, driven by expansive water treatment programs, a massive gold import sector, and a growing food processing industry. If you are seeking a sodium metabisulfite supplier in India, working directly with a chemical exporter in China can often offer cost advantages of 12–18% compared to local distributors, provided you manage shipping and quality inspection efficiently.
Hailei Chemical serves Indian buyers through Nhava Sheva, Mundra, Chennai, and Kolkata ports. Our typical packaging in 25 kg HDPE bags with inner liner is palletized and shrink-wrapped for tropical climates. We also offer 1000–1250 kg big bags and custom private labeling. For oil & gas or mining tenders, we provide full documentation: COA, MSDS, Certificate of Origin, and fumigation certificates as required by Indian customs (HS Code 28321010).
The same logistics expertise applies to buyers in the Middle East (Jebel Ali, Dammam), Southeast Asia, and Africa. Our in-house team coordinates FCL and LCL shipments, transit times, and demurrage avoidance. By consolidating volumes, we help you optimize landed costs without compromising the high purity and consistent properties of sodium metabisulfite you require.
Since 2005, Weifang Hailei Fine Chemical Co., Ltd. has been manufacturing and exporting sulfur-based chemicals under strict ISO 9001 and industry-specific certifications. Our sodium metabisulfite is produced in a dedicated facility with advanced crystallization controls, ensuring every batch meets the precise physical and chemical properties detailed in this guide. We maintain ready stock in our warehouse, enabling 7–15 day lead times for standard FCL orders.
When you partner with Hailei, you gain:
Don’t leave your procurement to chance. If you need a reliable supply of sodium metabisulfite that matches the property specifications critical to your operation, request a quote today. Visit our sodium metabisulfite product page to download the latest COA, MSDS, and application brochures, and let us customize a shipment that meets your exact volume and grading needs.
Understanding sodium metabisulfite price in China is critical for procurement managers, chemical engineers, and industrial buyers who rely on this versatile compound for water treatment, gold mining, food preservation, and pulp bleaching. As the world’s largest producer and exporter of sodium metabisulfite (SMBS), China plays a pivotal role in setting global benchmark prices. However, raw material costs, energy fluctuations, environmental regulations, and logistical challenges can cause significant price volatility. This comprehensive guide breaks down the factors influencing sodium metabisulfite price in China, offers practical tips for evaluating supplier quotes, and shows how to secure the best value without compromising on quality or compliance. By the end, you’ll have a clear framework for making cost-effective procurement decisions in 2025.
Sodium metabisulfite (Na2S2O5) is an inorganic compound produced primarily from two inexpensive raw materials: sulfur and sodium carbonate (soda ash). The process begins with burning sulfur to generate sulfur dioxide (SO2), which is then reacted with a sodium carbonate solution to form sodium sulfite. Further reaction with additional SO2 yields sodium metabisulfite, which is crystallized, dried, and packaged. This production route directly links SMBS prices to the costs of sulfur, soda ash, energy, and labor. Because sulfur is a byproduct of petroleum refining and natural gas processing, its price often correlates with crude oil markets. Similarly, soda ash pricing is influenced by global glass and detergent demand. Understanding these relationships helps buyers anticipate shifts in sodium metabisulfite price in China.
Manufacturers in China benefit from integrated production chains. Companies like Weifang Hailei Fine Chemical Co., Ltd. optimize yield and purity through advanced process control, ensuring consistent 97–98% purity for industrial and food-grade products. When you source from a premium sodium metabisulfite supplier in China, you gain access to production efficiencies that can mitigate raw material volatility—often resulting in more stable long-term contract pricing.
The properties of sodium metabisulfite directly influence its usability, storage requirements, and cost across different industries. SMBS is a white to yellowish crystalline powder with a pungent sulfur dioxide odor. Its key characteristics include:
These inherent properties of sodium metabisulfite mean that higher purity grades (98%+ with minimal iron and heavy metals) command a higher market price. When evaluating the sodium metabisulfite price in China, always confirm the chemical’s property specifications through a Certificate of Analysis (CoA) rather than relying solely on nominal purity.
To understand why sodium metabisulfite uses are so varied, it helps to look at the main consumption sectors. Each industry segment has distinct quality requirements and purchase volumes, which collectively influence market price trends. The primary sodium metabisulfite uses include:
Because demand from these sectors overlaps, any supply disruption—such as plant maintenance shutdowns in China’s Shandong province—can rapidly tighten the market and push up the sodium metabisulfite price in China. Diversifying your sourcing strategy and maintaining a qualified second supplier can be a valuable risk management tool.
When negotiating with Chinese manufacturers, it’s essential to look beyond the per-ton FOB or CIF price. The total landed cost includes raw materials, processing, packaging, logistics, and compliance overhead. Here are the five most influential factors shaping sodium metabisulfite price in China this year:
Seasonal variations also play a role. Demand for water treatment chemicals often rises in spring and summer, coinciding with increased water usage and maintenance shutdowns at municipal plants. This seasonal bump can temporarily lift the sodium metabisulfite price in China by 5–8%, making forward contracting a more attractive option for regular buyers.
A low quoted FOB price may hide risks such as inconsistent purity, inadequate packaging, or non-compliance with international standards. When evaluating the sodium metabisulfite price in China, consider these supplier evaluation criteria:
When you partner with an established producer like Weifang Hailei Fine Chemical, you gain more than a product—you get technical support, transparent pricing, and assistance with import regulations. This reduces your total cost of ownership, even if the unit price is marginally higher than a no-name supplier.
A frequently overlooked aspect that affects cost efficiency is sodium metabisulfite solution preparation. Improper mixing can lead to under-utilization of the chemical, requiring higher dosing and effectively increasing your cost per cubic meter of treated water or per ton of ore treated. Here is a reliable protocol for preparing a 10% w/v SMBS solution:
For gold mining operations that rely on precise cyanide destruction, on-site solution preparation using automated dosing systems can improve safety and halve chemical consumption. If you’re sourcing SMBS regularly, confirm that your supplier provides granularity options (powder vs. fine granular) that suit your mixing equipment. Our food and industrial grade sodium metabisulfite is available in multiple particle sizes to optimize dissolution rates and minimize dusting—enhancing both workplace safety and cost efficiency.
Armed with market knowledge, you can negotiate from a position of strength. Here are tactics that professional buyers use:
Always request a formal proforma invoice that itemizes product cost, packaging, freight, insurance, and any certificate fees. This transparency helps you compare quotes on an apples-to-apples basis and ensures that the sodium metabisulfite price in China you agree upon covers everything you need.
The sodium metabisulfite market in China is expected to remain balanced to slightly tight through early 2026. Several dynamics support this outlook:
Savvy buyers can turn these challenges into advantages by forming strategic partnerships now, before a capacity squeeze materializes. Locking in a supplier with strong environmental compliance also future-proofs your supply chain against regulatory non-compliance risks.
The sodium metabisulfite price in China is influenced by a complex interplay of raw materials, energy costs, quality requirements, and global demand. By understanding what sodium metabisulfite is made from, matching its properties and uses to your specific application, and correctly preparing SMBS solutions, you optimize both chemical efficiency and procurement spend. More importantly, evaluating suppliers based on total value rather than just quote price ensures consistent quality and supply security—two factors that outweigh a small per-ton saving.
Whether you need food-grade SMBS for wine preservation, industrial grade for municipal water dechlorination, or high-purity material for gold cyanide destruction, the key is to work with a manufacturer that combines scale, technical expertise, and export experience. At Weifang Hailei Fine Chemical, we produce sodium metabisulfite to international standards and offer transparent pricing that reflects real market conditions, not hidden fees.
Ready to secure a competitive quote and build a reliable supply chain for your sodium metabisulfite needs? Explore our full range of food and industrial grade sodium metabisulfite and request a customized quote today. We’re here to help you navigate the market and lock in the right price for your business.
For procurement managers and chemical engineers sourcing bulk reducing agents, a thorough understanding of the properties of sodium metabisulfite is the foundation of successful formulation, safe handling, and cost-effective supply chain management. From water dechlorination at municipal treatment plants to cyanide detoxification in gold mines and sulfite preservation in food processing, this versatile inorganic compound delivers reliable performance only when its chemical and physical characteristics align with end-use requirements.
At Weifang Hailei Fine Chemical Co., Ltd., we supply sodium metabisulfite (Na₂S₂O₅, CAS 7681-57-4) in both food-grade (FCC compliant) and industrial-grade (97–98% purity) to buyers across India, Southeast Asia, Africa, and the Middle East. This guide decodes every property you need to evaluate before issuing a purchase order, helping you avoid caking in storage, insufficient SO₂ release, or regulatory non-compliance.
Understanding what is sodium metabisulfite made from clarifies its inherent properties. Industrially, sodium metabisulfite is produced by saturating a sodium carbonate or sodium hydroxide solution with sulfur dioxide (SO₂). The exothermic reaction first forms sodium bisulfite (NaHSO₃) in solution, which is then carefully dehydrated through cooling and controlled crystallization to yield solid sodium metabisulfite:
2 NaHSO₃(aq) → Na₂S₂O₅(s) + H₂O
The product is a white to yellowish crystalline powder or granular material with a pungent SO₂ odor. Because its synthesis relies on high-purity SO₂ gas and a low-iron process environment, the quality of inputs directly determines the final product’s heavy metal profile and clarity in solution. For food-grade material, additional purification steps ensure compliance with FCC or E223 monographs, making it safe for use as a preservative in dried fruits, wines, and starch syrups.
A technical evaluation begins with the core properties of sodium metabisulfite. These data points influence dissolution rates, dosing precision, and compatibility with other process chemicals.
These parameters are not just laboratory curiosities—they directly affect real-world outcomes. For instance, the acidic pH of a metabisulfite solution makes it ideal for acidifying and preserving high-sugar food systems, while the decomposition temperature dictates safe storage away from heat sources.
Sodium metabisulfite is traded primarily in two purity specifications: industrial grade (typically 97–98% Na₂S₂O₅) and food grade (≥98% plus strict limits on iron, arsenic, and heavy metals). The property differences may seem subtle, but they have outsized impacts in sensitive applications.
Industrial grade (97–98%): Optimized for water treatment, gold mining (cyanide destruction), and pulp & paper bleaching. A lower assay of 97% still supplies more than 65% equivalent SO₂ content, but the 1–2% inert salts or sulfate residues can affect clarity in closed-loop water systems. Buyers should monitor iron content (<0.003% typical), since dissolved iron can catalyze unwanted oxidation or stain pulp.
Food grade (FCC/E223): Must meet purity thresholds for arsenic (≤3 mg/kg), lead (≤2 mg/kg), and selenium. The absence of chloride by-products ensures no off-flavors in wine or dried fruit. At Hailei Chemical, our food-grade sodium metabisulfite is manufactured under rigorous HACCP-guided protocols to guarantee compliance with international food safety standards.
When specifying your purchase, always request a Certificate of Analysis (COA) detailing assay, SO₂ content, pH of 10% solution, iron, heavy metals, and water-insoluble matter. The sodium metabisulfite product page provides typical Hailei COA ranges to simplify your comparison.
Many industrial buyers wonder about the interchangeability of sodium bisulfite and sodium metabisulfite. While both provide SO₂ in solution, their chemical properties lead to different dosing behaviors and storage considerations.
| Property | Sodium Metabisulfite (Na₂S₂O₅) | Sodium Bisulfite (NaHSO₃) |
|---|---|---|
| Physical form | Dry crystalline powder/granules | Often supplied as solution (approx. 40%) or crystalline solid (less stable) |
| SO₂ equivalent | Approx. 65–67% by weight | Approx. 22–24% in commercial solutions; solid bisulfite contains 60–65% but is hygroscopic |
| pH of solution | 4.0–5.5 (10% solution) | 2.5–4.0 (solution), more acidic |
| Stability in storage | Excellent when kept dry; >12 months shelf life | Solution prone to oxidation by air; solid form absorbs moisture rapidly |
| Shipping | Dry bulk; cost-effective long-distance shipping | Solution requires tankers or IBCs; higher freight per active SO₂ |
| Typical applications | Water dechlorination, gold mining, food preservative, pulp bleaching, textile | On-site chlorine neutralization, reducing agent in chemical synthesis, leather tanning |
The choice often boils down to logistics and pH buffering. For intercontinental shipments where freight cost and product stability matter, dry sodium metabisulfite is the preferred form. Upon dissolution in water, it forms sodium bisulfite ions, delivering the same reducing action. However, if your process demands immediate solution without handling dry powder, a pre-made bisulfite solution might be convenient—though it costs more per kilogram of SO₂ delivered. Hailei supplies both dry sodium metabisulfite and can direct you to logistics partners for sodium bisulfite solutions where needed.
Knowing how to use sodium metabisulphite safely and efficiently starts with respecting its reactivity profile. The compound’s core property is its ability to release sulfur dioxide in acidic conditions or when heated, making it a potent oxygen scavenger and antimicrobial agent.
In municipal and industrial water treatment, sodium metabisulfite instantly neutralizes free chlorine and chloramines. The stoichiometric reaction requires 1.34 parts of pure Na₂S₂O₅ per part of chlorine. A typical dosing rate is 2–3 mg/L of a 10% metabisulfite solution per mg/L residual chlorine, adjusted for mixing efficiency. Because the reaction drops pH slightly, systems with low alkalinity may need buffering.
The SO₂/air process (INCO method) uses metabisulfite as the SO₂ source to oxidize cyanides (CN⁻) to cyanate (OCN⁻), catalyzed by copper. The reducing property here must be carefully controlled: a solution pH between 8.5 and 9.5 optimizes cyanide destruction while minimizing off-gassing of HCN. Miners often dose metabisulfite at 2–4 grams per gram of WAD cyanide.
As an E223 additive, sodium metabisulfite inhibits enzymatic and non-enzymatic browning in dried fruits, frozen seafood, and wine. The effective SO₂ concentration for antimicrobial action is 50–400 ppm, depending on the product. Its ability to lower pH helps stabilize ascorbic acid and color. Importantly, residual sulfite must meet local labeling laws—typically <10 ppm SO₂ in final product.
In mechanical pulping, metabisulfite acts as a reducing bleach to brighten lignin-rich pulps without degrading cellulose. The property of preserving fiber strength while increasing brightness by 5–8 ISO points makes it valuable for newsprint and tissue grades. Typical application: 1–3% on oven-dry pulp at pH 5–6.
After chlorine bleaching, fabrics carry residual chlorine that can yellow or weaken fibers. A 0.5–2 g/L sodium metabisulfite bath, based on its rapid dechlorination property, eliminates this risk. The slightly acidic pH helps close fiber cuticles, improving dye uptake in subsequent steps.
For detailed application recipes and custom formulation support, refer to our comprehensive sodium metabisulfite application guide.
Procuring sodium metabisulfite without verifying properties against recognized standards can lead to inconsistent batch performance, rejected shipments, or even plant shutdowns. A rigorous supplier evaluation framework should include the following analytical benchmarks.
Request a batch-specific COA with every shipment. Third-party testing by SGS, Bureau Veritas, or Intertek adds an extra layer of trust. Hailei Chemical routinely arranges pre-shipment inspections against these parameters to ensure that the properties of sodium metabisulfite you order are exactly what you receive.
The shelf life and performance of sodium metabisulfite depend critically on storage conditions. Exposure to moisture and heat degrades its reducing power and turns the powder into a hard, unworkable mass.
Key recommendations:
Understanding these environmental sensitivities allows you to plan inventory turnover and avoid waste, directly protecting your investment in each purchased ton.
India is one of the world’s largest importers of sodium metabisulfite, driven by expansive water treatment programs, a massive gold import sector, and a growing food processing industry. If you are seeking a sodium metabisulfite supplier in India, working directly with a chemical exporter in China can often offer cost advantages of 12–18% compared to local distributors, provided you manage shipping and quality inspection efficiently.
Hailei Chemical serves Indian buyers through Nhava Sheva, Mundra, Chennai, and Kolkata ports. Our typical packaging in 25 kg HDPE bags with inner liner is palletized and shrink-wrapped for tropical climates. We also offer 1000–1250 kg big bags and custom private labeling. For oil & gas or mining tenders, we provide full documentation: COA, MSDS, Certificate of Origin, and fumigation certificates as required by Indian customs (HS Code 28321010).
The same logistics expertise applies to buyers in the Middle East (Jebel Ali, Dammam), Southeast Asia, and Africa. Our in-house team coordinates FCL and LCL shipments, transit times, and demurrage avoidance. By consolidating volumes, we help you optimize landed costs without compromising the high purity and consistent properties of sodium metabisulfite you require.
Since 2005, Weifang Hailei Fine Chemical Co., Ltd. has been manufacturing and exporting sulfur-based chemicals under strict ISO 9001 and industry-specific certifications. Our sodium metabisulfite is produced in a dedicated facility with advanced crystallization controls, ensuring every batch meets the precise physical and chemical properties detailed in this guide. We maintain ready stock in our warehouse, enabling 7–15 day lead times for standard FCL orders.
When you partner with Hailei, you gain:
Don’t leave your procurement to chance. If you need a reliable supply of sodium metabisulfite that matches the property specifications critical to your operation, request a quote today. Visit our sodium metabisulfite product page to download the latest COA, MSDS, and application brochures, and let us customize a shipment that meets your exact volume and grading needs.
Understanding sodium metabisulfite price in China is critical for procurement managers, chemical engineers, and industrial buyers who rely on this versatile compound for water treatment, gold mining, food preservation, and pulp bleaching. As the world’s largest producer and exporter of sodium metabisulfite (SMBS), China plays a pivotal role in setting global benchmark prices. However, raw material costs, energy fluctuations, environmental regulations, and logistical challenges can cause significant price volatility. This comprehensive guide breaks down the factors influencing sodium metabisulfite price in China, offers practical tips for evaluating supplier quotes, and shows how to secure the best value without compromising on quality or compliance. By the end, you’ll have a clear framework for making cost-effective procurement decisions in 2025.
Sodium metabisulfite (Na2S2O5) is an inorganic compound produced primarily from two inexpensive raw materials: sulfur and sodium carbonate (soda ash). The process begins with burning sulfur to generate sulfur dioxide (SO2), which is then reacted with a sodium carbonate solution to form sodium sulfite. Further reaction with additional SO2 yields sodium metabisulfite, which is crystallized, dried, and packaged. This production route directly links SMBS prices to the costs of sulfur, soda ash, energy, and labor. Because sulfur is a byproduct of petroleum refining and natural gas processing, its price often correlates with crude oil markets. Similarly, soda ash pricing is influenced by global glass and detergent demand. Understanding these relationships helps buyers anticipate shifts in sodium metabisulfite price in China.
Manufacturers in China benefit from integrated production chains. Companies like Weifang Hailei Fine Chemical Co., Ltd. optimize yield and purity through advanced process control, ensuring consistent 97–98% purity for industrial and food-grade products. When you source from a premium sodium metabisulfite supplier in China, you gain access to production efficiencies that can mitigate raw material volatility—often resulting in more stable long-term contract pricing.
The properties of sodium metabisulfite directly influence its usability, storage requirements, and cost across different industries. SMBS is a white to yellowish crystalline powder with a pungent sulfur dioxide odor. Its key characteristics include:
These inherent properties of sodium metabisulfite mean that higher purity grades (98%+ with minimal iron and heavy metals) command a higher market price. When evaluating the sodium metabisulfite price in China, always confirm the chemical’s property specifications through a Certificate of Analysis (CoA) rather than relying solely on nominal purity.
To understand why sodium metabisulfite uses are so varied, it helps to look at the main consumption sectors. Each industry segment has distinct quality requirements and purchase volumes, which collectively influence market price trends. The primary sodium metabisulfite uses include:
Because demand from these sectors overlaps, any supply disruption—such as plant maintenance shutdowns in China’s Shandong province—can rapidly tighten the market and push up the sodium metabisulfite price in China. Diversifying your sourcing strategy and maintaining a qualified second supplier can be a valuable risk management tool.
When negotiating with Chinese manufacturers, it’s essential to look beyond the per-ton FOB or CIF price. The total landed cost includes raw materials, processing, packaging, logistics, and compliance overhead. Here are the five most influential factors shaping sodium metabisulfite price in China this year:
Seasonal variations also play a role. Demand for water treatment chemicals often rises in spring and summer, coinciding with increased water usage and maintenance shutdowns at municipal plants. This seasonal bump can temporarily lift the sodium metabisulfite price in China by 5–8%, making forward contracting a more attractive option for regular buyers.
A low quoted FOB price may hide risks such as inconsistent purity, inadequate packaging, or non-compliance with international standards. When evaluating the sodium metabisulfite price in China, consider these supplier evaluation criteria:
When you partner with an established producer like Weifang Hailei Fine Chemical, you gain more than a product—you get technical support, transparent pricing, and assistance with import regulations. This reduces your total cost of ownership, even if the unit price is marginally higher than a no-name supplier.
A frequently overlooked aspect that affects cost efficiency is sodium metabisulfite solution preparation. Improper mixing can lead to under-utilization of the chemical, requiring higher dosing and effectively increasing your cost per cubic meter of treated water or per ton of ore treated. Here is a reliable protocol for preparing a 10% w/v SMBS solution:
For gold mining operations that rely on precise cyanide destruction, on-site solution preparation using automated dosing systems can improve safety and halve chemical consumption. If you’re sourcing SMBS regularly, confirm that your supplier provides granularity options (powder vs. fine granular) that suit your mixing equipment. Our food and industrial grade sodium metabisulfite is available in multiple particle sizes to optimize dissolution rates and minimize dusting—enhancing both workplace safety and cost efficiency.
Armed with market knowledge, you can negotiate from a position of strength. Here are tactics that professional buyers use:
Always request a formal proforma invoice that itemizes product cost, packaging, freight, insurance, and any certificate fees. This transparency helps you compare quotes on an apples-to-apples basis and ensures that the sodium metabisulfite price in China you agree upon covers everything you need.
The sodium metabisulfite market in China is expected to remain balanced to slightly tight through early 2026. Several dynamics support this outlook:
Savvy buyers can turn these challenges into advantages by forming strategic partnerships now, before a capacity squeeze materializes. Locking in a supplier with strong environmental compliance also future-proofs your supply chain against regulatory non-compliance risks.
The sodium metabisulfite price in China is influenced by a complex interplay of raw materials, energy costs, quality requirements, and global demand. By understanding what sodium metabisulfite is made from, matching its properties and uses to your specific application, and correctly preparing SMBS solutions, you optimize both chemical efficiency and procurement spend. More importantly, evaluating suppliers based on total value rather than just quote price ensures consistent quality and supply security—two factors that outweigh a small per-ton saving.
Whether you need food-grade SMBS for wine preservation, industrial grade for municipal water dechlorination, or high-purity material for gold cyanide destruction, the key is to work with a manufacturer that combines scale, technical expertise, and export experience. At Weifang Hailei Fine Chemical, we produce sodium metabisulfite to international standards and offer transparent pricing that reflects real market conditions, not hidden fees.
Ready to secure a competitive quote and build a reliable supply chain for your sodium metabisulfite needs? Explore our full range of food and industrial grade sodium metabisulfite and request a customized quote today. We’re here to help you navigate the market and lock in the right price for your business.