-  Product Identification

CAS No. :

7757-83-7

EINECS No. :

231-821-4

H.S. Code :

2832.100000

Formula :

Na₂SO₃

Molecular Weight :

126.04

Toxicity :

Oral mouse LD50: 820 mg/kg

Synonyms :

Sodium Sulfite Anhydrous; Disodium Sulfite; Natrii Sulphis; Natrium Sulfurosum;

Natriumsulfit (German); Sulfurous Acid, Disodium Salt;

-  Physical And Chemical Properties

Physical State :

White crystalline powder

Melting Point :

Decomposes

Specific Gravity :

2.633

Solubility in water :

good

PH :

9

Vapor Density :

4.35

NFPA Ratings :

Health: 1 Flammability: 0 Reactivity: 0

Stability :

Stable under ordinary conditions

-  Applications

- Pharmaceutical industry for the production of chloroform, benzene, styrene sulfone, formaldehyde.

- Rubber industry as a coagulant.

- Bleached cotton printing and dyeing industry as the dechlorination agent, cotton scouring agent.

It can prevent the partial oxidation of cotton cloth fiber and influence the fiber strength.

- Leather tanning industry for processing，make the leather soft, plump, tough, waterproof, bending,

wear and other properties.

- The chemical industry for the production of vanillin hydroxyl, hydroxylamine hydrochloride and so on.

- Photographic Industry as a developer, etc.

- The food industry as a bleaching agent, preservatives, leavening agent, antioxidant, color agents

and the insurance agent. as reducer in producing dehydration vegetables.

- Electronics industry for the manufacture of photosensitive resistance.

- Paper-making, Electronic, Water-treatment for electroplating wastewater, drinking water, etc.

-  Specification

Testing Items

Quality Standard – Type (1)

 Quality Standard – Type (2)

Appearance :

White crystalline powder

 White crystalline powder

Purity – NA2SO3 :

97% Min

93% Min

Water Insoluble :

0.02% Max

0.03% Max

Fe :

0.003% Max

0.005% Max

Free Alkali, as NA2CO3 :

0.1% Max

0.4% Max

Sulphates, as NA2SO4 :

2.5% Max

-

Chlorides, as NACL :

0.1% Max

-

-  Transportation

Storage :

Stored in cool and dry place, avoid moisture and heat

Packing :

In 25kgs /50kgs /1000kgs net p.p. woven bags

-  Other Trade Information

Min. Order Quantity :

25 MTS

Supply Capacity :

22,000Mts /Year

Loading Capacity :

27Mts/1080Bags (1x20'FCL)

Port of Loading :

Huangpu / Hengyang / Tianjin, China

Fresh Stocks :

Yes

Ref. Price :

USD305.- ~ USD520.- /MT FOB Huangpu / Tianjin, China

Shipment Time :

Within 2-3 weeks upon receipt of advance payment or L/C .

Payment Terms :

T/T, L/C ( Sight / 90days ), D/P, Western Union

Origin :

Hunan, Tianjin

Sample Availability :

Yes

Main Export Markets :

India, Indonesia, Thailand, Pakistan, Bangladesh, Iran, Argentina, Turkey