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Sodium metabisulfite

Description Uses Preparation Product Specification Health Hazard References
Sodium metabisulfite
Sodium metabisulfite
Chemical Name:
Sodium metabisulfite
E223;fertisilo;SodiuM pyrosulfit;Sodium disulphite;Sodiummetabisufite;Sodium pyrosulfite;Sodium dissulfite ;Disodium disulphite;Sodium pyrosulphite;disodiumpyrosulphite
Molecular Formula:
Formula Weight:
MOL File:

Sodium metabisulfite Properties

Melting point:
150 °C
storage temp. 
Store at RT.
540 g/L (20°C)
White to slightly yellow
3.5-5 (50g/l, H2O, 20℃)
Water Solubility 
540 g/L (20 ºC)
Air & Moisture Sensitive
Stable. Incompatible with strong oxidizing agents, strong acids. Contact with strong acids releases a poisonous gas. May be moisture and air sensitive.
CAS DataBase Reference
7681-57-4(CAS DataBase Reference)
EPA Substance Registry System
Disulfurous acid, disodium salt(7681-57-4)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  Xn,Xi
Risk Statements  22-31-41-36/37/38-52
Safety Statements  26-39-46-36-16
RIDADR  3260
WGK Germany  1
RTECS  UX8225000
PackingGroup  III
Hazardous Substances Data 7681-57-4(Hazardous Substances Data)
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501
H318 Causes serious eye damage Serious eye damage/eye irritation Category 1 Danger P280, P305+P351+P338, P310
Precautionary statements:
P264 Wash hands thoroughly after handling.
P264 Wash skin thouroughly after handling.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

Sodium metabisulfite price More Price(32)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 1.06528 Sodium disulfite (sodium metabisulfite) for analysis EMSURE ACS,Reag. Ph Eur 7681-57-4 1EA $56 2017-11-08 Buy
Sigma-Aldrich 08982 Sodium metabisulfite analytical standard 7681-57-4 1g $44.8 2018-11-13 Buy
Alfa Aesar 033375 Sodium metabisulfite, SO2 58.5% min 7681-57-4 500g $17.6 2018-11-16 Buy
Alfa Aesar 033375 Sodium metabisulfite, SO2 58.5% min 7681-57-4 2kg $38.6 2018-11-16 Buy
Sigma-Aldrich 13459 Sodium metabisulfite puriss., meets analytical specification of Ph. Eur., BP, NF, FCC, E223, dry, 97-100.5% 7681-57-4 1kg-r $44.3 2018-11-13 Buy

Sodium metabisulfite Chemical Properties,Uses,Production


Sodium metabisulfite (chemical formula: Na2S2O5) appears as a white crystalline or powder solid with a slight sulfur odor. It is toxic upon inhalation and can strongly irritate skin and tissue. It can be decomposed to release toxic oxide fumes of sulfur and sodium upon high temperature. It can be mixed with water to form a corrosive acid. It is generally used as disinfectant, antioxidant, and preservative agent as well as a laboratory reagent. As a kind of food additive, it can be used as a preservative and antioxidant in food. It can also be applied to the wine and beer making. Moreover, it can be used to sanitize the equipment of homebrew and winemaking as a cleaning agent. It also have various kinds of other applications, e.g. being applied to photography, as an excipients in some tablets, for water treatment, as a source of SO2 in wine, as a bactericide and as a bleaching reagent as well as reducing agent. It can be manufactured through the evaporation of a sodium bisulfite which has been saturated with sulfur dioxide. It should be warned that sodium metabisulfite has certain acute effects on the respiratory system, eyes and skin. In severe case, it can cause breathing difficulty and even pulmonary damage which finally leads to death. Therefore, effective protective measures and attention should be taken during the operation.


Sodium metabisulfite (SMBS, Sodium disulfite) is a white, granular solid sodium salt. an inorganic compound made up of sodium, sulfur, and oxygen, and used in many industries:
  1. in the pulp and paper industry, in the photographic industry and in the various other industries as a bleach or dechlorinator.
  2. Food Grade sodium metabisulfite may be used as a food preservative. It is also commonly added to various food products and wines as a preservative.
  3. Sodium metabisulfite can also be used in the manufacture of other chemicals, Used in production of cleaning agents, detergents, and soaps.
  4. It also acts as a corrosion inhibitor in oil and gas industry, as a bleaching agent in the production of coconut cream, as the source of sulfur dioxide and in the destruction of cyanide in commercial gold cyanidation processes.
  5. Gold mining industry: It is utilized in the precipitation of gold from auric acid as well as in the waste water treatment to remove hexavaent chromium as trivalent chromium by precipitation after reduction.
  6. Preservative in photo developer solutions, it is used in photography.
  7. Oxygen scavenge:it plays as an oxygen scavenger to eliminate the dissolved oxygen in wastewater and in pipes.
  8. Sodium metabisulfite may be used as an initiator during the cross-linking polymerization of polybutadiene in the cores of the vesicle membranes.
  9. It may be added as an antioxidant during the preparation of stock solutions of 6-hydroxydopamine in various studies.
  10. Dechlorination in municipal wastewater, pulp & paper, power, and textile water treatment plants.


manufactures sodium metabisulfite by reacting sulfur dioxide with sodium carbonate (soda ash), purifying and drying to form crystals or powder.
Na2CO3 + 2SO2→Na2S2O5 + CO2

Product Specification

Sodium Metabisulfite, wt% 98.7% min.
Assay as SO2 66.5 min.
Insolubles, wt% ≤ 0.005
Chloride, wt% ≤ 0.05
Thiosulfate, wt% ≤ 0.05
Arsenic, ppm ≤ 1.0
Heavy metals, ppm ≤ 10.0
Iron as (Fe), ppm ≤ 2.0
Selenium, ppm ≤ 5.0
Lead as (Pb), ppm ≤ 2.0

Health Hazard

Sodium metabisulphite is currently listed in Annex III Part B of Directive 95/2/EC as an authorised food additive. As such food labelling is required where sulphite residues exceed 10 mg/kg (ppm). This is labelled E223 with maximum permitted residues in crustacean products set at 150 mg/kg. However it is now accepted that sulphites, when present in foodstuffs, can cause allergic reactions in vulnerable persons and can constitute a danger to health (Collins-Williams, 1983). Metabisulphite is regarded as one causative agent of asthma attacks (Gunnison & Jacobsen, 1987). In accordance with this, EU Directive 2003/89/EC will make allergen labelling a requirement for all food stuffs produced in the European Community, which have been treated with sodium metabisulphite.
Sodium metabisulfite typically found in consumer products should pose little a risk of symptoms due to skin or inhalation exposure since sodium metabisulfite is used in very low concentrations. Sodium metabisulfite can produce the following adverse health affects:
  1. Contact - Skin exposures can cause symptoms ranging from minor skin irritation or itching to redness and swelling. Eye exposure to sodium metabisulfite may result in redness, tearing or moderate eye irritation.
  2. Inhalation - The inhalation of sodium metabisulfite dusts can cause nose and throat irritation or coughing. Repeated or prolonged exposures may cause sore throat or nosebleeds. Inhalation may also cause severe respiratory reactions and aggravate asthma or other breathing diseases.
  3. Ingestion - The ingestion of sodium metabisulfite may cause irritation of the mouth and throat, nausea, vomiting and diarrhea.
  4. Other Effects - The International Agency for Research on Cancer (IARC) has not classified sodium metabisulfite as a carcinogen (cancer causing).


Chemical Properties

white crystalline powder with a sulfur smell


ChEBI: An inorganic sodium salt composed of sodium and disulfite ions in a 2:1 ratio.


Pharmaceutic aid (antioxidant).

Contact allergens

This agent is frequently used as a preservative in pharmaceutical products, in the bread-making industry as an antioxidant, and it can induce contact dermatitis. It can be used as a reducing agent in photography and caused dermatitis in a photographic technician, probably acting as an aggravating irritative factor. Sodium metabisulfite contains a certain amount of sodium sulfite and sodium sulfate.

Sodium metabisulfite Preparation Products And Raw materials

Raw materials

Preparation Products

Sodium metabisulfite Suppliers

Global( 302)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 22119 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 20795 55
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32764 55
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 China 1465 55
career henan chemical co
+86-371-86658258 CHINA 10011 58
Shanghai Zheyan Biotech Co., Ltd.
18017610038 CHINA 3625 58
0536-8231856 China 236 55
J & K SCIENTIFIC LTD. 400-666-7788 +86-10-82848833
+86-10-82849933; China 96815 76
Meryer (Shanghai) Chemical Technology Co., Ltd. +86-(0)21-61259100(Shanghai) +86-(0)755-86170099(ShenZhen) +86-(0)10-62670440(Beijing)
+86-(0)21-61259102(Shanghai) +86-(0)755-86170066(ShenZhen) +86-(0)10-88580358(Beijing) China 40399 62
Alfa Aesar 400-610-6006; 021-67582000
021-67582001/03/05 China 30308 84

View Lastest Price from Sodium metabisulfite manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-08-20 Sodium metabisulfite
US $1.00 / KG 1G 98% 100KG
2018-07-24 Sodium metabisulfite
US $350.00 / KG 100KG 99% 200ton

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