Sodium metabisulfite CAS 7681-57-4

Basic Info

Model No.: X-CAS 7681-57-4

Type: Sodium Sulfide

Grade Standard: Agriculture Grade

Appearance:: White Crystalline Powder

MF:: Na2O5S2

MW:: 190.10700

Density:: 1.48

MP: 150 °C

Soluble: 540 G/L (20 ºC)

Additional Info

Packaging: 25kg /50kg/ 1000kg / 1100kg pp woven bags & pe bag inside.

Productivity: 1000kg per month

Brand: zhishang

Transportation: Ocean,Land,Air

Place of Origin: Shandong, China (Mainland)

Supply Ability: in stock

Certificate: ISO CE

HS Code: 2832100000

Port: Shanghai,Tianjin,Qingdao

Product Description

Sodium metabisulfite

Production methods: 

1. The broken sulfur into the combustion furnace, and through the theoretical amount of about 2 times the compressed air, at 600 ~ 800 ℃ spontaneous combustion. After the cooling and dusting and washing into the multi-stage reactor, and sodium carbonate solution for reverse absorption; absorption liquid temperature control at about 45 ℃, multi-stage reaction effluent by centrifugal separation, 160 ℃ below the drying is finished. The reaction equation is as follows:

2. Add a certain amount of soda ash to sodium bisulfite solution to form a suspension of sodium sulfite. Through the sulfur dioxide, the formation of sodium metabisulfite crystallization, centrifugal separation, drying in the system. Or sodium carbonate solution to absorb sulfur dioxide gas to generate sodium bisulfite solution, when the end of the reaction, from sodium bisulfite saturated liquid precipitation, centrifugal dehydration, drying in the system.

3. Install the glass wool in the lower part of the ordinary glass drying tower and fill the mixture of NaHCO3 and the glass plate and allow SO2 gas from the lower part of the tower under negative pressure until no more carbon dioxide is released. The water produced in the reaction is concentrated at the bottom of the column and the resulting salt is actually dry. Sieve the broken glass, into a closed bottle. And then the anhydrous salt in the large porcelain crucible at 500 ~ 600 ℃ for 2 ~ 3h, burning to the preparation of the sample solution and AgNO3 reaction generated by the precipitation of pure white (not yellow) so far.


Tests Specification
Appearance White free-flowing Crystal Powder
Purity (Na2S2O5) 96.5% min
Iron (Fe) 0.003% min
Heavy Metal (Pb) 5 ppm max
Arsenic (As) 1 ppm max
Water Insoluble 0.05% max
PH Value 4.0-4.6



Sodium Metabisulfite
Other names sodium metabisulphite
Formula Na2S2O5  HS Code: 2832 1000 00
CAS NO. 7681-57-4
EINECS NO. 231-673-0
Appearance white powder
Packing 25kgs bag or bulk bag.
Yearly output  50,000MTS
Application Basic chemical material, used as high pure reagents. Widely used in chemical, 
metallurgy, paper making, oil, textile and daily use chemical industry


We strictly complying with ISO9001 and ISO 2000 standard in manufacturing process, our lab and workshop tightly in accordance with GMP standard.

Our Advantage

1.Stable quality, high quality satisfy customer’s high grade sourcing request.

2.Competitive price .

3.Correct delivery time promise.

4.Continuous improvement make sure the long-term cooperation.

5.Honest service for your whole sourcing process


1.Cooperate with research institutions, we strictly control the process from raw material to finished product.

2.The customer comes first, we provide reasonable price, high quality product and prompt shipment.

3.We can send the goods to your delivery address directly. It is relatively safe and fast. We have ready goods in stock.
4.Quick and clear response to customers questions.
5.Warm after sale service, we will help to solve the problems in your usage.
5.We could make our price discount if you place a substantial order with us.

Product expansion

1> Cosmetic Raw Materials: Cosmetics is a variety of raw materials through a reasonable deployment of processing from the compound mixture. Cosmetics with a wide range of raw materials, different performance. According to the Raw Material properties and uses of cosmetics, can be divided into matrix materials and auxiliary raw materials in two categories.

2> Active Pharmaceutical Ingredients(API): API refers to the raw materials in the production of various types of preparations, which is the active ingredient in powder,crystal and paste for medicine use through chemical synthesis,plant extract, and preparations of biotechnology institute.

3> Fragrance And Spices: Spices are an important part of fine chemicals, it is composed of natural spices, synthetic spices and single fragrance.

4> Organic Raw Material: Intermediates are also known as organic intermediates. The use of coal tar or petroleum products as raw materials to produce dyes, resins, additives, and other intermediates.

5> Chemicals Used In Paints: Paint, the traditional Chinese name is paint. So-called coating is coated on the surface of the object that be protected or be adornment, and with the continuous film coating to form strong adhesion.

6> Pharmaceutical Intermediates: The so-called pharmaceutical intermediates, refers to the production of pharmaceutical products in the process, the use of raw materials, materials, accessories and other intermediate products.

7> Agricultural Chemicals: Research and agriculture related chemical, including pesticide, plant growth regulator, fertilizer, compound fertilizer, herbicide etc.

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