Zouping Changshan Zefeng Fertilizer Co., Ltd.

Sodium Metabisulfite, Chemicals, Sodium Bicarbonate manufacturer / supplier in China, offering CAS No. 7681-57-4 97% Food Grade Preservative Sodium Metabisulfite, Potassium Magnesium Sulfate with SGS Certification, Wholesale Paraffin Wax for Candle and so on.

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CAS No. 7681-57-4 97% Food Grade Preservative Sodium Metabisulfite

FOB Price:US $385 / Ton
Min. Order (Tons) FOB Price
10+ US $385 / Ton
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Min. Order: 10 Tons
Port: Qingdao, China
Production Capacity: 3000mts Per/Month
Payment Terms: L/C, T/T

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Basic Info.

Model NO.:sodium metabisulfite
Grade Standard:Food Grade
Product Name:CAS No. 7681-57-4 97% Food Grade Preservative Sodi
CAS No.:7681-57-4
Classification:Other Inorganic Salts
Other Name:Smbs
Einecs No.:231-673-0
Place of Origin:China(Mainland)
Application:Water Treatment, Bleaching Agent
Molecular Weight:190.1065
Transport Package:25kg Plastic Woven Bag
Origin:China (Mainland)

Product Description

Sodium Metabisulfite (SMBS)
is mainly used as reduction agent. Furthermore, sodium metabisulfite is ideal for the bleaching of vegetable fibers and textile, for the production of solutions, which are used in the developing of photos and films as well as for the treatment of tanning agents in dyeing of textiles. ChoiceChem offers different grades' sodium metabisulfite, all meeting highest quality standards.







1. Chemical Analysis




Assay(Na2S2O5 )

96.0% min.


Iron content(base on Fe)

   0.005% max.


water insoluble matter

 0.05% max.


Arsenic content(base on As)

1 ppm max.



   10 ppm max.



                  White or yellowish crystalline powder

Test Standard

                  Food Grade:   GB 1893-2008

                  Industrial Grade: HG/T2826-1997

2. Application

Industrial Uses

Water Treatment

Eliminating dissolved oxygen in waste water and in pipes;
Cleaning water pipes and reverse osmosis membranes in desalinization equipment as it is an antibacterial.
Sodium metabisulfite is used in water treatment plants to remove excess chlorine.

Bleaching Agent

Sodium metabisulfite's functions as a bleaching agent, which is useful in making paper pulp, cotton and wool.

Food Preservative


Sodium metabisulfite is commonly used as a food preservative for dried foods, as well as fruit concentrate juices.
Sodium metabisulfite acts as an antimicrobial, inhibiting the growth of fungi and bacteria, thereby keeping food fresh and safe.

In beer and wine manufacturing, sodium metabisulfite is used as both a sterilizer and an antioxidant in the process of brewing beer or fermenting wine.

Other Uses



Sodium metabisulfite  is an antioxidant additive in inject able medicines and is also used as a reducing agent in pharmaceuticals.

Photographic and film industry

For preparing developer solutions, for acidifying fixing baths (photo grade).

Landscape Gardening

Sodium metabisulfite used in landscape gardening as a tree stump remover, as it disintegrates the lignin -- chemicals in plant cell walls -- in the tree stumps, making them easier to remove.

Fiber Industry

In the sulphitisation of tanning extract.

Gold mining

For bleaching ground wood, as an antichlor.

3. Transportation Information:

DOT Classification:

Not a DOT controlled material


Not applicable.

Packing Group:

Not applicable.

4. Storage & Handing
(1). Precautions:
Keep locked up.
Do not ingest.
Do not breathe dust.
Avoid contact with skin.
Wear suitable protective clothing.
In case of insufficient ventilation, wear suitable respiratory equipment.
If ingested, seek medical advice immediately and show the container or the labels.
Keep away from incompatibles such as oxidizing agents, acids.
(2). Storage:
Not allowed in room with any oxidant or strong acid, and keep away from an oxidation by air or humidity.
Sodium Metabisulphite should NOT store for long time. DO NOT mix with inflammable substances, gasoline and oxidants.
During transportation, keep away from direct sunlight and humidity.
5. Packing
In net 25kg / 1000kg / 1100kg / 1200kg / 1250kg pp bags
Packing with pallets ( per customer's requirements )
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