Sodium Sulfite CAS#7757-83-7

Excellent Bleaching and Decolorizing PerformanceEffectively used in pulp and papermaking to improve whiteness and product appearance.


Strong Antioxidant and Preservation FunctionHelps maintain the fresh look and stability of finished products and formulations.


Versatile Pharmaceutical AdditiveSupports the stability and effectiveness of many drug products.


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


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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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FAQ

Q1: Is Huafeng Chemical a manufacturer or a trader?
A: We are a professional service provider specializing in chemical foreign trade. Rather than being limited to the products of a single factory, we leverage the chemical industry cluster in Shandong Province to integrate production resources from multiple high-quality manufacturers. This allows us to offer a wide range of sourcing options—covering various product categories and origins—instead of simply pushing a single product. Furthermore, our core competitiveness lies in our professional foreign trade services (covering documentation, logistics, and regulatory compliance), ensuring a smooth and worry-free procurement process for you.


Q2: How is the security of my transaction guaranteed when working with Huafeng Chemical?
A: We strictly adhere to international trade rules (Incoterms® 2020) and accept various payment methods, such as Letters of Credit (L/C) and Telegraphic Transfers (T/T). For new clients, we support small-batch trial orders and can clearly define arbitration clauses and applicable laws within the contract. Additionally, we maintain a robust risk management system to help you mitigate common trade risks, such as exchange rate fluctuations, shipping delays, and document discrepancies.


Q3: Do you have experience serving clients in Russian-speaking regions?
A: Yes. We place great importance on the Russian-speaking market; our team includes Russian-speaking business professionals who are well-versed in the import regulations of Russia and the Eurasian Economic Union (EAEU). We understand the importance of EAC certification to clients in these regions and can assist with related compliance inquiries. We have established connections with chemical traders across various CIS countries and have gained valuable experience in specialized packaging and temperature-controlled shipping designed to withstand harsh local winter conditions.


Q4: How do you guarantee product quality?
A: We implement a strict supplier qualification and periodic audit system. A Certificate of Analysis (COA)—issued by the original manufacturer—is provided with every shipment. We also welcome pre-shipment inspections conducted by internationally recognized third-party agencies such as SGS, BV, or ITS. Should the test results fail to meet the standards specified in the contract, you have the right to reject the goods or request a replacement.

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