Sodium Sulfite
Dongguan Weiqi Chemical Co., Ltd. was established in March 2019, at a time when China's chemical industry was undergoing rapid growth, with increasing demand for chemical products across various sectors. Founded by industry veterans with extensive experience in chemistry, the company is located in Qiaotou Town, Dongguan City, Guangdong Province. Qiaotou's dynamic industrial ecosystem and convenient transportation facilitate raw material procurement and product distribution.
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25kg Sodium SulfiteAs a trusted global chemical supplier, we offers 25kg Sodium Sulfite – a 99%+ purity, moisture-resistant powder engineered for water treatment, food safety, and industrial redox reactions.read more -
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Sodium Hydro SulphiteAs a leading chemical supplier, we offers 25kg Sodium Hydro Sulphite, a 99%+ pure, white crystalline powder with a mild sulfur odor, engineered for textile bleaching, food preservation, and...read more
Why choose us
Strict Quality Control
Regular sampling and testing during production help identify any potential quality deviations. Final products undergo rigorous performance and safety tests before delivery. All measures adhere to international quality management standards, ensuring that customers receive only first-class chemical products.
Advanced Facilities
A dedicated R&D laboratory is equipped with sophisticated analytical instruments, enabling our R&D team to conduct in-depth research, develop new formulas, and optimize existing products.
Certificates and Documents
- SGS (Swiss General Standards)
- Hazardous Chemicals Business License
- Non-pharmaceutical Precursor Chemicals Business Filing Certificate (Ether, Acetic Anhydride, Bromine)
- Non-pharmaceutical Precursor Chemicals Business Filing Certificate (Acetone, Toluene, Sulfuric Acid, Potassium Permanganate)
Our Services
We offer free returns and exchanges for quality issues within 30 days, provide SGS inspection reports, and offer long-term discounts to loyal customers.
Sodium sulfite is a kind of inorganic substance, chemical formula Na2SO3, common sulfite. It can irritate eyes, skin and mucous membranes and pollute water sources. High thermal decomposition produces toxic sulphide smoke. In industry, it is mainly used for making cellulose sulfite ester, sodium thiosulfate, organic chemicals, bleached fabrics, etc., and also used as reducing agent, preservative, dechlorination agent, etc
Chemical formula: Na2SO3
Molecular weight: 126.043
CAS NO. : 7757-83-7
EINECS NO. : 231-821-4
Appearance and properties: White crystalline powder
Density: 2.63 g/cm3
Refractive index: 1.484
Solubility: Easily soluble in water
Product Parameters
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Sodium sulfite Basic information |
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Product Name: |
Sodium sulfite |
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CAS: |
7757-83-7 |
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MF: |
Na2O3S |
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MW: |
126.04 |
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EINECS: |
231-821-4 |
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Mol File: |
7757-83-7.mol |
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Sodium sulfite Chemical Properties |
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Melting point |
500 °C |
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Density |
2.63 |
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Refractive index |
1484 |
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Storage temp. |
Store at RT. |
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Solubility |
H2O: 1 M at 20 °C, clear, colorless |
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Form |
Solid |
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Specific Gravity |
2.633 |
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Color |
White to slightly yellow |
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Odor |
Odorless |
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Item |
Quality Index |
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Industry Grade |
Food Grade |
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Purity ( As Na2SO3) |
96.0% min |
98.0% min |
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Sodium sulphate ( SO4) |
2.0% max |
1.2% max |
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Chlorides ( As NaCL) |
0.5% max |
0.08% max |
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Heavy metals ( As Pb ) |
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0.0005% max |
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Iron (Fe) |
0.005% max |
0.003% max |
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Water insoluble |
0.05% max |
0.01% max |
Application
Food industry: Sodium sulfite is used as a food preservative to prevent the growth of bacteria and fungi. It is commonly used in dried fruits, wines, and meat products.
Photography: Sodium sulfite is used in developing solutions for photographic films and papers. It helps to remove the unexposed silver halides from the film, preventing further development.
Water treatment: Sodium sulfite is used in water treatment plants to remove excess chlorine from water. It acts as a reducing agent and helps to neutralize the chlorine, making the water safe for consumption.
Textile industry: Sodium sulfite is used as a bleaching agent and a reducing agent in the textile industry. It helps to remove color impurities from fabrics and improves the dyeing process.
Pulp and paper industry: Sodium sulfite is used in the production of pulp and paper. It helps to break down lignin, a natural polymer present in wood, and aids in the delignification process.
Chemical industry: Sodium sulfite is used in various chemical reactions as a reducing agent. It is also used in the production of dyes, chemicals, and pharmaceuticals.
Cosmetics industry: Sodium sulfite is used in some cosmetic products as a preservative and an antioxidant. It helps to prevent the growth of bacteria and oxidation of the product.
Gas scrubbing: Sodium sulfite is used in gas scrubbing processes to remove sulfur dioxide (SO2) from industrial flue gases. It reacts with SO2 to form sodium sulfate, which can be easily removed.
Precautions: Do not ingest. Do not breathe dust. Wear suitable protective clothing. If ingested, seek medical advice immediately and show the container or the label. Keep away from incompatibles such as oxidizing agents, combustible materials, organic materials, acids.
Storage: Air sensitive. Moisture sensitive. Keep container tightly closed. Keep container in a cool, well-ventilated area.
Packaging & Shipping
Packaging:
25 Kg plastic woven bag with PE inner/jumbo bag.
Customerized packaging & label is accepted.
Shipping: By sea or railway upon available.
Lead time: Within 7 to 10 days after order confirmation
Certificates and Documents
FAQ
As one of the leading sodium sulfite manufacturers and suppliers in China, we warmly welcome you to wholesale bulk sodium sulfite for sale here and get pricelist from our factory. All chemicals are with high quality and low price.
25kg Sodium Sulfite