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Sodium dithionite

Description References
Sodium dithionite
Sodium dithionite structure
Chemical Name:
Sodium dithionite
hydros;burmol;blankit;LYKOPON;v-briteb;vatrolite;SODIUM HYDR;HYDROSULFITE;Natriumdithionit;SODIUM DITHIONITE
Molecular Formula:
Formula Weight:
MOL File:

Sodium dithionite Properties

Melting point:
300 °C
Boiling point:
Flash point:
storage temp. 
Store at RT.
250 g/L (20°C)
5.5-8.5 (50g/l, H2O, 20℃)
Water Solubility 
250 g/L (20 ºC)
Moisture Sensitive
Stable, but air sensitive. Incompatible with strong acids, strong oxidizing agents, water, moisture.
CAS DataBase Reference
7775-14-6(CAS DataBase Reference)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
  • NFPA
Hazard Codes  Xn
Risk Statements  7-22-31
Safety Statements  26-28-43-7/8-43E-28A
RIDADR  UN 1384 4.2/PG 2
WGK Germany  1
Autoignition Temperature >200 °C
HazardClass  4.2
PackingGroup  II
HS Code  28311010
Hazardous Substances Data 7775-14-6(Hazardous Substances Data)
Toxicity LD50 orally in Rabbit: 2500 mg/kg
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H251 Self-heating; may catch fire Self-heating substances and mixtures Category 1 Danger
H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501
Precautionary statements:
P235+P410 Keep cool. Protect from sunlight.
P407 Maintain air gap between stacks/pallets.
P413 Store bulk masses greater than … kg/…lbs at temperatures not exceeding … oC/…oF.
P420 Store away from other materials.

NFPA 704

Diamond Hazard Value Description
2 2
Health   2 Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury (e.g. diethyl ether, ammonium phosphate, iodine)
Flammability   1 Materials that require considerable preheating, under all ambient temperature conditions, before ignition and combustion can occur. Includes some finely divided suspended solids that do not require heating before ignition can occur. Flash point at or above 93.3 °C (200 °F). (e.g. mineral oil, ammonia)
Instability   2 Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water (e.g. white phosphorus, potassium, sodium)

(NFPA, 2010)

Sodium dithionite price More Price(14)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 157953 Sodium hydrosulfite technical grade 7775-14-6 1kg $69.4 2018-11-13 Buy
Sigma-Aldrich 157953 Sodium hydrosulfite technical grade 7775-14-6 2kg $122 2018-11-13 Buy
Alfa Aesar 033381 Sodium hydrosulfite, tech., 85+% 7775-14-6 25g $19.4 2018-11-16 Buy
Alfa Aesar 033381 Sodium hydrosulfite, tech., 85+% 7775-14-6 1kg $58.8 2018-11-16 Buy
Sigma-Aldrich 71699 Sodium hydrosulfite ≥82% (RT) 7775-14-6 250g $63.3 2018-11-13 Buy

Sodium dithionite Chemical Properties,Uses,Production


Sodium dithionite is also called sodium hydrosulfite, sodium hydrosulphite, sodium sulfoxylate, and sulfoxylate. Sodium dithionite is not stable under physiological conditions, with the rate of decomposition increasing with increasing acidity. Upon contact with moisture, it is oxidized to hydrogen sulfite (HSO3-), sulfite (SO32-) and hydrogen sulfate (HSO4-). Under strongly acidic conditions it may liberate sulfur dioxide. Under anaerobic conditions (such as in the lower gastrointestinal tract), hydrogen sulfite (HSO3-) and thiosulfate (S2O32-) may be formed. Hydrogen sulfite (HSO3-) can be absorbed after ingestion. It is efficiently metabolized and the major part rapidly is excreted as sulfate into the urine.
Sodium dithionite is widely used in industry owing to its reducing properties and ability to react with oxygen. It is used in textile industry for dyeing, in the pulp and paper industry as a reducing bleach to remove yellow discoloration from cellulose based products, as an oxygen scavenger in boilers, in conservation to remove iron stains on cultural artifacts, and in water treatment for controlling iron flash on white fabrics in bleaching environments.  It is also used in photographic film, clay, wine, leather goods, foods and beverages, polymers, cleaners, gas purification, environmental remediation, metal recovery, and chemical processing.


[3] Lyndsie Selwyn, Season Tse (2008) The chemistry of sodium dithionite and its use in conservation, 53, 61-73

Chemical Properties

White solid


Reducing agent for vat dyes,reducing hair bleaching agents,vat dyes printing auxiliaries, silk scouring and bleaching agents, coloring agents and objects stripping vat cleaning agent


As reducing agent, particularly in dyeing with indigo and vat dyes; bleaching soaps, straw; removing dyes from dyed fabrics.


ChEBI: An inorganic sodium salt that is the disodium salt of dithionous acid.

General Description

Sodium dithionite is a whitish to light yellow crystalline solid having a sulfur dioxide-like odor. Sodium dithionite spontaneously heats on contact with air and moisture. This heat may be sufficient to ignite surrounding combustible materials. Sodium dithionite is soluble in water. Under prolonged exposure to fire or intense heat containers of Sodium dithionite may violently rupture. Sodium dithionite is used in dyeing and to bleach paper pulp.

Reactivity Profile

Inorganic reducing agents, such as Sodium dithionite, react with oxidizing agents to generate heat and products that may be flammable, combustible, or otherwise reactive. Their reactions with oxidizing agents may be violent. Sulfites and hydrosulfites (dithionites) can react explosively with strong oxidizing agents (sodium chlorite). Sulfites generate gaseous sulfur dioxide in contact with oxidizing acids and nonoxidizing acids.


Fire risk in contact with moisture. To extin- guish fires, flood the reacting mass with water.

Health Hazard

Fire will produce irritating, corrosive and/or toxic gases. Inhalation of decomposition products may cause severe injury or death. Contact with substance may cause severe burns to skin and eyes. Runoff from fire control may cause pollution.

Fire Hazard

Flammable/combustible material. May ignite on contact with moist air or moisture. May burn rapidly with flare-burning effect. Some react vigorously or explosively on contact with water. Some may decompose explosively when heated or involved in a fire. May re-ignite after fire is extinguished. Runoff may create fire or explosion hazard. Containers may explode when heated.

Safety Profile

Toxic and an irritant. An allergen. Flammable when exposed to heat or flame. Ignites on contact with water or sodium chlorite. To extinpsh fires, flood the reacting mass with water. Decomposes violently when heated to 19OOC and emits toxic fumes of SOx and NazO

Sodium dithionite Preparation Products And Raw materials

Raw materials

Preparation Products

Sodium dithionite Suppliers

Global( 248)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Mainchem Co., Ltd.
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Hefei TNJ Chemical Industry Co.,Ltd.
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Shanghai Aladdin Bio-Chem Technology Co.,LTD 021-20337333/400-620-6333
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Meryer (Shanghai) Chemical Technology Co., Ltd. +86-(0)21-61259100(Shanghai) +86-(0)755-86170099(ShenZhen) +86-(0)10-62670440(Beijing)
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3B Pharmachem (Wuhan) International Co.,Ltd. 86-21-50328103 * 801、802、803、804 Mobile:18930552037
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Alfa Aesar 400-610-6006; 021-67582000
021-67582001/03/05 China 30168 84

Sodium dithionite Spectrum

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