Sodium metabisulfite Bulk Supply for Industrial Use
China Factory Direct
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| CAS number | 7681-57-4 |
| Product name | Sodium metabisulfite |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Pharmaceutical GradeMaterial GradeSpecialty GradeIndustrial Grade |
| Packaging | 25KG/bag500KG/bag1000KG/bag |
| Sample | Test Samples Available (Click to Request Samples) |
| COA | View COA |
| Price | Get Quote |
| Supply Type | Bulk / Contract manufacturing / OEM |
| Shipping | FCL / LCL available |
| Payment Terms | Support FOB \ CIF \ EXW quotations, and accept Letter of Credit (L/C). |
| Manufacturer | Greenrock Chemical(China Factory) |
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Documents We Provide for Sodium metabisulfite
Post-sale: Full documentation is provided.
To request documents, please contact us via email at sales@GRchemical.com.
Bulk Sodium metabisulfite Supplier from China
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
Industrial Applications of Sodium metabisulfite
| Industry | Application | Process |
|---|---|---|
| Food Industry | Antioxidant, preservative | Added to food products such as wine, fruit juice, and dried fruits to inhibit microbial growth and prevent oxidative spoilage |
| Dyeing and Printing Industry | Bleaching agent, reducing agent | Applied in bleaching and reduction treatments during dyeing of cotton, silk, wool, and other fibers |
| Water Treatment | Disinfectant, dechlorinating agent | Used to remove residual chlorine from water, adjust pH, and suppress algal growth |
| Chemical Synthesis | Intermediate, reducing agent | Employed as a reducing reagent in organic synthesis reactions, including the production of sulfides and azo compounds |
| Pharmaceutical Industry | Pharmaceutical excipient, stabilizer | Used in certain pharmaceutical formulations to prevent oxidative degradation of active ingredients |
| Leather Industry | Depilatory agent, tanning auxiliary | Applied in leather processing to facilitate hair removal and enhance tanning performance |
| Petroleum Industry | Drilling fluid additive | Used to suppress hydrogen sulfide generation and modify drilling fluid properties |
| Paper Industry | Bleaching aid | Used in combination with hydrogen peroxide to improve pulp bleaching efficiency |
Manufacturing Quality Control of Sodium metabisulfite
| Detection Item | Common Testing Methods | Method Overview |
|---|---|---|
| Content Determination | Iodometry | Utilizes the property of sodium metabisulfite to reduce iodine under acidic conditions. The content is calculated by titrating with a standard iodine solution, using starch as an indicator. |
| Heavy Metals | Sulfide Colorimetry (e.g., lead, arsenic) | Under acidic or alkaline conditions, sodium sulfide is added to generate colored metal sulfide precipitates, which are then quantified via colorimetric analysis. |
| Clarity and Color | Visual Turbidity/Colorimetry | The sample is dissolved in water and visually compared with standard turbidity or color reference solutions to assess clarity and color compliance. |
| Drying Loss | Drying Method (Atmospheric or Vacuum Drying) | The sample is dried at 105°C until constant weight is achieved; moisture and volatile substance content are calculated based on the weight loss. |
| Residue on Ignition | Gravimetric Method | The sample is subjected to high-temperature incineration, and the residual inorganic matter is weighed to determine the content of non-volatile inorganic impurities. |
| pH Value | pH Meter Measurement | The pH of a specified concentration of sodium metabisulfite aqueous solution is directly measured using a pH meter. |
| Chlorides | Silver Nitrate Turbidimetry | In nitric acid medium, chlorides react with silver nitrate to form white silver chloride precipitate, which is quantified via turbidimetric analysis. |
| Sulfates | BaCl₂ Turbidimetry | In hydrochloric acid medium, sulfates react with barium chloride to form white barium sulfate precipitate, which is analyzed by turbidimetry for content determination. |
| Iron Salts | Thiocyanate Colorimetry | In acidic conditions, iron ions react with ammonium thiocyanate to form a red complex, which is quantified through colorimetric measurement. |
| Arsenic Compounds | Gutzeit Method (Modified Marsh Test) | Uses zinc metal reacting with acid to generate nascent hydrogen, which reduces arsenic compounds to arsine gas. The gas reacts with mercuric bromide paper, producing a visible color change for arsenic detection. |
| Microbial Limits Test | Plate Count Method, Membrane Filtration Method | Performed according to pharmacopoeial requirements to determine total counts of aerobic bacteria, molds, and yeasts, as well as testing for control organisms such as Escherichia coli. |
Technical Specifications of Sodium metabisulfite
| Test Item | Specification |
|---|---|
| Appearance | White crystalline powder |
| Purity | >=98.5% |
| Water Content (KF) | <=0.5% |
| Residue on Ignition | <=0.2% |
| Heavy Metals | <=10 ppm |
| Total Impurities | <=1.5% |
| Odor | Characteristic sulfurous odor |
Specifications vary by industry. Reach out to our technical experts for a COA tailored specifically to your application. Email:selse@GRchemical.com
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Download COA of Sodium metabisulfite
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Packaging of Sodium metabisulfite
Industrial Sodium metabisulfite Procurement FAQ
1. How do you ensure product quality consistency?
We rely on a mature China-based manufacturing system and implement strict batch control and quality inspection for every shipment. Our production process complies with ISO 9001 standards, and a COA is provided for each batch to ensure consistent and reliable quality.
2. Do you offer competitive pricing for bulk orders?
Yes, as a China-based manufacturer and bulk supplier, we provide tiered pricing based on order volume. We support FOB and CIF quotations, as well as L/C payment terms for large transactions to meet international trade requirements.
3. Can you support large-volume or long-term supply?
We have stable production capacity and a well-established supply chain, enabling continuous bulk supply. We support ton-level and container-level orders, as well as long-term cooperation projects.
4. What is your typical lead time?
For in-stock products, shipment can be arranged within 1–3 days. For bulk packaging or customized orders, lead time depends on the specific quantity and production schedule.
5. What documents do you provide?
We can provide complete documentation upon request, including COA, SDS, TDS, and other compliance certificates, meeting industrial procurement and export requirements.
6. Can you customize product specifications or packaging?
Yes, we support customization of parameters such as purity, impurities, residual solvents, and heavy metals. We also offer various bulk packaging options, including 25kg bags, drums, and IBC tanks, suitable for industrial applications and transportation.
7. What shipping options do you support?
We support both FCL (Full Container Load) and LCL (Less than Container Load) shipments, and can flexibly arrange logistics solutions based on order size to meet bulk chemical export needs.
8. Do you provide technical or application support?
Yes, we provide basic application guidance and technical support based on industry experience to help customers optimize product usage.
9. How do you handle compliance and export regulations?
We are familiar with international trade and export regulations, ensuring all products comply with relevant requirements. We also provide complete documentation to support smooth customs clearance and global delivery.
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