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Sodium Sulfite CAS#7757-83-7

  • Sodium Sulfite CAS#7757-83-7
  • Sodium Sulfite CAS#7757-83-7
  • Sodium Sulfite CAS#7757-83-7
  • Sodium Sulfite CAS#7757-83-7
  • Sodium Sulfite CAS#7757-83-7

Sodium Sulfite CAS#7757-83-7

Excellent Bleaching and Decolorizing Performance：Effectively used in pulp and papermaking to improve whiteness and product appearance.


Strong Antioxidant and Preservation Function：Helps maintain the fresh look and stability of finished products and formulations.


Versatile Pharmaceutical Additive：Supports the stability and effectiveness of many drug products.


Effective Water Treatment and Environmental Application：Works as an oxygen scavenger and is useful in flue gas desulfurization and photographic processing.


Phone ：+86 18626059817
WhatsApp ：+86 18626059817
Email ：cora@wxqysteel.com
product description

Product Description of Sodium Sulfite CAS#7757-83-7

Sodium Sulfite (Na₂SO₃) is a water-soluble sodium salt of sulfurous acid, featuring bleaching, desulfurization and dechlorination properties, with extensive industrial applications. It is mainly used in the pulp and paper industry for efficient bleaching, and also serves as an additive to maintain the fresh appearance of finished products. In pharmaceutical preparations, it helps preserve the efficacy and stability of drugs. Additionally, it is applied in water treatment as an oxygen scavenger, flue gas desulfurization, and the maintenance of photographic developer solutions.


Product Application of Sodium Sulfite CAS#7757-83-7

Sodium Sulfite (CAS 7757-83-7) is an inorganic compound with reducing and alkaline properties, widely used in various fields. In chemical and industrial sectors, it is applied for post-bleaching dechlorination in textiles, pulping and digestion processes in papermaking, deaeration in water treatment, chromium-containing wastewater treatment, as well as depilation and softening in the leather industry. In the food and beverage industry, it acts as a preservative, bleaching agent and antioxidant for preserved fruits, fruit juices and other food products, and also serves to regulate fermentation in brewing processes.

Product Information

Parameters


Melting point500 °C
density2.63
bulk density1480kg/m3
refractive index1,484
storage temp.Store at +5°C to +30°C.
solubilityH2O: 1 M at 20 °C, clear, colorless
formSolid
Specific Gravity2.633
colorWhite to slightly yellow
OdorOdorless
PH9.0-10.5 (25℃, 1M in H2O)
PH Range9.0 - 10.5 at 126 g/l at 25 °C
Water Solubility23 g/100 mL (20 ºC)
SensitiveHygroscopic
Merck148,682
Stability:Stable. Incompatible with strong acids. Moisture and air sensitive.
CAS DataBase Reference7757-83-7(CAS DataBase Reference)
NIST Chemistry Referencesodium sulfite(7757-83-7)
EPA Substance Registry SystemSodium sulfite (7757-83-7)
Absorptioncut-off at 265nm in H2O at 1M
Hazard CodesXn
Risk Statements31-36/37/38-22-40-36/38
Safety Statements24/25-36-26-22
WGK Germany1
RTECSWE2150000
F3-10
TSCAYes
HS Code28321000
Hazardous Substances Data7757-83-7(Hazardous Substances Data)
ToxicityLD50 i.v. in mice: 175 mg/kg, Hoppe, Goble, J. Pharmacol. Exp. Ther. 101, 101 (1951)


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We are a supply chain service provider rather than a single manufacturer. Instead of being tied to one specific factory, we have established deep partnerships with numerous high-quality domestic chemical enterprises that hold certifications such as ISO and REACH. This allows us to flexibly match the most suitable supply sources to your needs while independently conducting third-party quality inspections to ensure delivery quality and price competitiveness.
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How do your overseas warehouses operate, and what are the practical benefits?

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We maintain transit warehouses with standing inventory in Southeast Asia, the Middle East, and Eastern Europe.
For you: You can pick up goods directly from local warehouses without the need for full-container orders; delivery times are reduced from the standard 30–45 days to just 3–5 days.
Reduced inventory pressure: You can purchase small batches for trial and quality verification before scaling up orders, avoiding the need to tie up large amounts of capital upfront.
Emergency restocking: If your production line faces a sudden material shortage, we can urgently dispatch supplies from our regional warehouses to prevent production downtime.
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What is the Minimum Order Quantity (MOQ)?

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For standard products, the MOQ is typically one 20-foot container (approx. 16–20 tons) for direct shipments from China. However, for stock picked up from overseas warehouses, we support orders starting from 1 ton—ideal for sample testing or small-batch production. Specific MOQs depend on the product category and packaging type; please contact us for details.
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How do you ensure product quality?

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We implement a "three-level quality control" system:
Before leaving the factory: We require the factory to provide a Certificate of Analysis (COA) for the specific batch.
Before shipment: We commission international third-party agencies like SGS or Intertek to conduct random inspections, with costs covered by us (for long-term partners).
After arrival: If quality issues arise, we commit to unconditional negotiation regarding returns, exchanges, or compensation, and we assume full responsibility. All terms are stipulated in the contract.
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We accept T/T (Telegraphic Transfer), L/C (Letter of Credit at sight or usance), and D/P (Documents against Payment). For clients with a long-standing partnership and good credit standing, we offer partial credit terms (e.g., 30–60 days), subject to negotiation based on transaction history and due diligence results. Cash on Delivery (COD) is available for local customers ordering in-stock items from our overseas warehouses.
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What is the typical delivery lead time?

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FOB (China Port): Goods are prepared and shipped within 7–15 working days after the contract is signed and the prepayment is received.
Overseas Warehouse Stock: Items are dispatched within 1–3 working days of order confirmation and payment; local delivery typically takes 2–5 days (depending on the country).
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Which trade terms do you offer? Do you support DDP (Delivered Duty Paid)?

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We are proficient in handling common terms such as FOB, CIF, CFR, and EXW. Additionally, for regions covered by our overseas warehouses, we offer DDP services (including duties and door-to-door delivery), allowing you to receive goods without the hassle of complex import customs clearance procedures. Please consult your sales manager for specific costs.
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How can I obtain samples? What are the costs?

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If stock is available at an overseas warehouse, we can provide 1–2 kg of samples for free; you only need to cover the local courier fees.
If shipping from China, we can arrange delivery via DHL or FedEx; samples are free, but you bear the international shipping costs. Once a clear intent to cooperate is established, these shipping costs can be deducted from your first order.
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Can the contract price be adjusted if product prices fluctuate?

A：
We offer a price protection mechanism:
For fixed-price contracts, we do not unilaterally raise prices due to market increases.
If you anticipate a market downturn, we can negotiate floating pricing—settling based on a benchmark price on the date of shipment or arrival—to flexibly manage fluctuations.
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What does your after-sales service include?

A：
We provide full-lifecycle service:
Usage Guidance: Assistance with adjusting processing parameters (if required).
Complaint Handling: Response within 48 hours and a solution provided within 7 days.
Regular follow-ups: Proactive contact every six months to understand changing needs and optimize supply solutions.
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