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Anhydrous Sodium Sulfite CAS NO 7757-83-7`

Name: Anhydrous Sodium Sulfite CAS NO 7757-83-7`
Brand: YIDA
SKU: pr2610101539
Price: 420 USD
Availability: InStock

34 Inquiries

Unit Price:

$420-480/MT FOB

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CAS No.:

7757-83-7

Grade:

Food Grade

Content:

97%

Port:

XIAMEN

Brand:

YIDA

Packaging:

25kg / Woven Bag

Sample Available:

Yes

Price valid (until):

2026-11-10

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Xiamen Yida Chemical Import And Export Co., Ltd.

Company Type:

Distributor

Location:

China

Payment Terms:

TT against copy of documents,TT against B/L draft before shipment,100% TT in advance

Average Lead Time:

20 days

Qualification:

Main Products:

aryl or toluenesulfonic acid,Alkyl,hydrazine content,Ammonium bifluoride,Ammonia,Methanol

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Product Description
Seller Information
Inquiry History

Description

Product Detail

Brief Introduction:

Anhydrous Sodium Sulfite (Na₂SO₃), also known as Sodium Sulphite, is an inorganic sulfite with CAS No.7757‑83‑7. It is white crystalline powder and soluble in water. We supply both food grade and industrial grade sodium sulfite. Food‑grade sodium sulfite functions as antioxidant and preservative E221, widely applied for dried fruits, sugar production, beverages and other food processing industries. Industrial‑grade sodium sulfite serves as reducing agent for water treatment deoxygenation, textile bleaching, paper pulp treatment and synthesis of chemical raw materials.

Specification:

Assay (Na₂SO₃): ≥97.0%

Appearance: White Crystalline Powder

Iron (Fe): ≤0.005%

Heavy Metal (as Pb): ≤10ppm

Water Insoluble Matter: ≤0.1%

Packing & Storage: Packed in 25kg woven bag, customized packaging is available. Store in cool and dry warehouse with good sealing condition. Keep away from open air to avoid oxidation deterioration.

Our Advantage: As a trustworthy manufacturer and supplier, we maintain stable product supply capacity. COA and SDS documents can be provided upon customer request. Custom‑made specifications are acceptable.

Items	Specifications
Assay (Na₂SO₃)	≥97.0%
Iron (Fe)	≤0.005%
Water Insoluble Matter	≤0.1%
Heavy Metal (as Pb)	≤10ppm

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With 15 years of experience in chemical foreign trade, we offer the following core strengths to support your procurement needs:

1.A 70,000 ㎡ warehouse (20,000 MT capacity) with moisture-proof and temperature-controlled systems, enabling efficient fulfillment of large-volume orders.
2.Free samples (Ship within 3-7 days) to let you test products at zero trial cost.
3.Transparent lead time for hazardous chemicals: 45–60 days, with clear delivery schedules.
4.Certified with a Hazardous Chemical Business License and ISO certification, ensuring smooth customs clearance.
5.6 packaging options with customizable logos to minimize product loss during transportation.
6.Over 400 chemical SKUs available for one-stop procurement, helping you reduce sourcing costs.

Please share your purchase volume, target market, and other requirements, and we will tailor a customized solution for you!

ECHEMI Editorial Reference

Sodium sulfite occurs as an odorless white powder or hexagonal prisms. Note that the commercially available sodium sulfite is often presented as a white to tan- or pink-colored powder that would not conform to the pharmacopeial specification. Sodium sulfite,Na2S03, is a white,water-soluble, crystalline solid with a sulfurous, salty taste. It decomposes when heated. Sodium sulfite is used as a source of sulfite,as a chemical intermediate and food preservative, in medicine and paper manufacturing
Sodium sulfite is a white odorless powder. Density 2.633 g / cm3. Moderately toxic. Sinks in water and dissolves slowly. Also transported as a heptahydrate Na2SO3.7H2O.|DryPowder; DryPowder, Liquid; Liquid; OtherSolid; PelletsLargeCrystals|White crystalline powder or colourless crystals|WHITE CRYSTALS OR POWDER.
Sodium sulfite is a white odorless powder. Density 2.633 g / cm3. Moderately toxic. Sinks in water and dissolves slowly. Also transported as a heptahydrate Na2SO3.7H2O.|Sodium sulfite is an inorganic sodium salt having sulfite as the counterion. It has a role as a food preservative and a reducing agent. It is an inorganic sodium salt and a sulfite salt. It contains a sulfite.|Sodium Sulfite is a white crystal or powder with reducing property. Sodium sulfite exhibits bleaching, de-sulfurizing, and dechlorinating activities. This agent was used by food industry to help maintain the fresh appearance of food products. It is also a component in many drugs, which helps maintain their potency and stability. FDA has ruled sodium sulfite a new animal drug of low regulatory priority.

Basic Info

Product Name:

Sodium sulfite

Other Name:

Sulfurous acid,sodium salt (1:2);Sulfurous acid,disodium salt;Anhydrous sodium sulfite;Disodium sulfite;Sodium sulfite (Na2SO3);Sodium sulfite anhydrous;Sodium sulfite;Disodium sulfite (Na2SO3);S-WAT;E 221;68135-69-3

CAS No.:

7757-83-7

Molecular Formula:

H2O3S.2Na

InChIKeys:

InChIKey=YKZJGZHPDUVUKN-UHFFFAOYSA-N

Molecular Weight:

126.037

Exact Mass:

125.936356

EC Number:

231-821-4

UNII:

VTK01UQK3G

ICSC Number:

1200

DSSTox ID:

DTXSID2044260

NCI Thesaurus Code:

C28205

Color/Form:

Small crystals or powder|White hexagonal crystals|White crystals or powder

HScode:

28321000

Categories:

Food Antioxidants

Characteristics

PSA:

82.4

XLogP3:

-4

Appearance:

Sodium sulfite is a white odorless powder. Density 2.633 g / cm3. Moderately toxic. Sinks in water and dissolves slowly. Also transported as a heptahydrate Na2SO3.7H2O.

Density:

2.63 g/cm³

Melting Point:

>500°C

Boiling Point:

Decomposes (NTP, 1992)

Refractive Index:

1.484

Water Solubility:

H2O: 23 g/100 mL (20 ºC)

Storage Conditions:

Sodium sulfite should be stored in a well-closed container in a cool, dry, place. In solution, sodium sulfite is slowly oxidized to sulfate by dissolved oxygen; strong acids lead to formation of sulfurous acid/ sulfur dioxide. On heating, sodium sulfite decomposes liberating sulfur oxides.

Vapor Pressure:

Negligible (NTP, 1992)

Toxicity:

Non-toxic

Odor:

Odorless

Taste:

Saline, sulfurous taste

PH:

8,5-11,5 (anhydrous: 10 % solution; heptahydrate: 20 % solution)

Experimental Properties:

Density: 1.539. MP: decomposes; loses 7 H2O at 150 °C /Sodium sulfite heptahydrate/|Efflorescent crystals. Unstable, oxidizing in air to sulfate. Soluble in 1.6 parts water, about 30 parts glycerol; sparingly soluble in alcohol. Aqueous solution is alkaline and dissolves sulfur; pH approximately 9 /Sodium sulfite heptahydrate/

Air and Water Reactions:

Soluble in water. Reacts with hot water, steam or acids to produce corrosive material.

Reactive Group:

Sulfite and Thiosulfate Salts

Reactivity Alerts:

Strong Reducing Agent

Reactivity Profile:

SODIUM SULFITE is a reducing agent, particularly under basic conditions. Reacts with oxidizing agents such as peroxides, epoxides, oxoacids. Emits toxic fumes of sodium oxide and oxides of sulfur if heated to decomposition [Lewis, 3rd ed., 1993, p. 1174].

Autoignition Temperature:

Not flammable (USCG, 1999)

See More Sodium sulfite Properties 

Hazard Identification

Classification of the substance or mixture

Not classified.

GHS label elements, including precautionary statements

Precautionary statement(s)
Pictogram(s)	No symbol.
Signal word	No signal word
Hazard statement(s)	none
Prevention	none
Response	none
Storage	none
Disposal	none

Other hazards which do not result in classification

no data available

Handling and Storage

Precautions for safe handling

Handling in a well ventilated place. Wear suitable protective clothing. Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Use non-sparking tools. Prevent fire caused by electrostatic discharge steam.

Conditions for safe storage, including any incompatibilities

Separated from strong oxidants and acids. Store in an area without drain or sewer access.

See More Sodium sulfite Safety Data Sheet 

Seller Information

Business Type:
Distributor

Main Products:
aryl or toluenesulfonic acid,Alkyl,hydrazine content,Ammonium bifluoride,Ammonia,Methanol

Location:
Room A415, No.28 Xianglian Li, Siming District, Xiamen City

Payment Terms:
TT against copy of documents,TT against B/L draft before shipment,100% TT in advance

Average lead Time:
20 days

Total Annual Revenue:
$2.5 million-$5 million

Total Employees:
5-10

Year of Establishment:
2010

Company Certificates
- Filing Certificate for the Operation of Non-pharmaceutical Precursor Chemicals
- Hazardous Chemicals Business License

Inquiry History

34 Inquiries

Country	Product	Purchase Quantity	Date Posted
India	Sodium Sulfite anhydrous 98 %	200.00 KG	Apr 19, 2024
United States	SODIUM SULFITE NA2SO3 20% WT WATER 80% WT	400.00 L	Jun 23, 2026
Egypt	96% Sodium Sulfite	40 MT	Apr 30, 2026
South Africa	Sodium Sulphite	50 MT	Feb 18, 2026
India	Sodium sulphite	10.00 MT	Feb 11, 2026
United States	Sodium Sulfite	1 MT	Nov 26, 2025
Qatar	Sodium Sulphite (Na2SO3)	10.00 MT	Jun 20, 2025
Saudi Arabia	Sodium Sulfite	1 KG	Jun 5, 2025
India	sodium sulfite	20.00 TON	Apr 1, 2025
Qatar	Sodium Sulphite	25 TON	Dec 23, 2024
Kuwait	Sodium Sulfite Anhydrous	12800 MT	Jul 25, 2024
Vietnam	Sodium Sulphite	27 TON	Jul 1, 2024
India	Sodium sulphite	1.00 MT	Jun 26, 2024
India	Sodium Sulphite	20.00 MT	May 20, 2024
Myanmar	SODIUM SULFITE	26 TON	Jan 24, 2024
Indonesia	Sodium sulfite	20 MT	Oct 13, 2026
Indonesia	Sodium sulfite	20 MT	Oct 9, 2026
United Arab Emirates	Sodium sulfite 96%	25.00 KG	Jul 24, 2025
Russia	sodium sulfite, anhydrous	100 TON	Jul 23, 2025
Kuwait	ANHYDROUS SODIUM SULPHITE	12800 MT	Jul 25, 2024

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Anhydrous Sodium Sulfite CAS NO 7757-83-7`

Product Description

Seller Information

Inquiry History

Classification of the substance or mixture

GHS label elements, including precautionary statements

Other hazards which do not result in classification

Precautions for safe handling

Conditions for safe storage, including any incompatibilities

Related Products

More Choices Find All Products for Sale 

Sodium sulfite Market Price

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