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Thiourea Dioxide, Formamidine Sulfinic Acid 80%, 90%, 99% CAS 1758-73-2

Thiourea Dioxide, Formamidine Sulfinic Acid 80%, 90%, 99% CAS 1758-73-2

Thiourea Dioxide, Formamidine Sulfinic Acid 80%, 90%, 99% CAS 1758-73-2 Product Name: Thiourea Dioxide, Formamidine sulfinic acid Synonyms: (Sodium Hydrosulfite replacement) CAS Number: 1758-73-2 Characteristics: White crystalline powder Assay: 80%, 90%, 99% Thiourea Dioxide Formula: CH4N2O2S;...

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Thiourea Dioxide, Formamidine Sulfinic Acid 80%, 90%, 99% CAS 1758-73-2

Thiourea Dioxide, Formamidine Sulfinic Acid 80%, 90%, 99%.jpg

Product Name:  Thiourea Dioxide, Formamidine sulfinic acid

Synonyms: (Sodium Hydrosulfite replacement)

CAS Number: 1758-73-2

Characteristics:  White crystalline powder

Assay:  80%, 90%, 99% Thiourea Dioxide

Formula: CH4N2O2S; (NH2)2CSO2 = 108.12


Thiourea Dioxide, Formamidine Sulfinic Acid 80%, 90%, 99% formula.jpg

Package:  25kg/bag, 50kg/bag, 1000kg/bag, 25kg/drum, 50kg/drum or according to the customer's requirement.

Thiourea Dioxide, Formamidine Sulfinic Acid 80%, 90%, 99% package.jpg

Storage of Thiourea Dioxide: The temperature is suggested to be below 30°C. Dry, well ventilated area away from all source of ignition,  source of heat and direct sunlight.  Keep away from incompatible materials. Keep containers tightly closed. Do not store in unlabeled or mislabeled containers. Protect from moisture. Do not store near combustible materials. Store avoid together with organics and reducing materials.

UN Number: 3341

Dangerous class: 4.2

Thiourea Dioxide Drum Package.png

KEY Words: Thiourea Dioxide, Formamidine sulfinic acid

Description of Thiourea Dioxide:

Thiourea Dioxide is an organosulfur compound, which is widely and commonly used in the textile making industry. Thiourea Dioxide is white crystals, soluble in water, aqueous solution and it has both the characteristics of hydrogen peroxide and urea. Thiourea Dioxide plays a role as a reducing agent. Strictly speaking, Thiourea Dioxide is actually not a dioxide, but it is a derivative of a sulfinic acid (RS(O)(OH), That is why Thiourea Dioxide is also called formamidine sulfinic acid.

Thiourea Dioxide Actual Cargo Picture.png

Thiourea Dioxide is one new-type environmental-friendly substance. It is used to replace Sodium Hydrosulfite as a replacement. Thiourea Dioxide has a better heat stability, higher reducibility, easier operation compared with Sodium Hydrosulfite.

Transportation and storage of Thiourea Dioxide is convenient and not need to be under very strict conditions. Thiourea Dioxide is also commonly used to reduce dyes and sulfur dyeing, wool and silk bleaching etc.

In paper making industry, Thiourea Dioxide can be a agent for deinking the waste paper.

Fengchen Group is a leading supplier of Thiourea dioxide Powder from China. We specialize in wholesale and bulk amounts, ensuring all our clients have the right supplier of Thiourea dioxide or Formamidine sulfinic acid powder when they need it. When you are going to buy or purchase Thiourea dioxide Powder, please turn to Fengchen Group.

As a professional China Thiourea Dioxide, Formamidine sulfinic acid Raw Material supplier and Manufacturer in China, FENGCHEN GROUP CO., LTD has been supplying and exporting Thiourea Dioxide, Formamidine sulfinic acid API from China in China for almost 10 years.

Features and advantages:

Thiourea Dioxide is an odorless and stable compound without oxidizability and reducibility. It is very stable even in 20-30 degree aqueous solution, but Thiourea Dioxide will decompose gradually under heat and alkali conditions.

- Thiourea Dioxide does not result in flammability problems if it contacts moisture.

- Formamidine sulfinic acid shows a very good storage stability.

- Thiourea Dioxide has a high reduction potential

- Further more, Thiourea Dioxide is very economical compared with some traditional hydrosufite based reducing agents

- Formamidine sulfinic acid is also fully biodegradable, eco-friendly.

Usage and applications:

Thiourea dioxide is widely seen used in reductive bleaching in textiles. It has also been used for the reduction of aromatic nitroaldehydes and nitroketones to nitroalcohols.

Thiourea dioxide can also be used as reduction cleaning agent, stripping agent and machine cleaning agent in textile industry.

In paper industry, thiourea Dioxide is used for de-inking and bleaching pulp to replace Sodium Hydrosulfite.

Thiourea Dioxide can also be applied for daily chemicals and rubber industries.

As a new type of neutral detergent additives, Thiourea Dioxide can also be used in the bleaching of cotton, wood fiber, artificial silk and wool. In addition, it is commonly used in animal feed additives and medical fungicides, as well as the protective products of oral and dental.

A new environmental-friendly substance which can be used to replace sodium hydrosufite. Till now, there is no pollution problems reported about thiourea Dioxide or Formamidine sulfinic acid. It has better thermal stability and stronger reducing properties.

Other uses: It may be used as catalyst for producing synthetic resins in the polymer material industry, and also has applications in organic synthesis of photosensitive materials, pharmaceuticals, spices and other fine chemicals, as well as in precious metal recovery and separation.


Thiourea (also called Thiocarbamide or Sulfourea) is the diamide of thiocarbonic acid which resembles urea while still contains sulfur instead of oxygen. 'Thio'  is a chemical prefix indicates the replacement of an oxygen in an acid radical by sulfur with a negative valence of 2; meaning 'Sulfur' derived from the Greek theion. In fact, thiourea occurs as the mixture of two tautomers: S=C(NH2)2 ( Thiourea) + HS=CNHNH2 (Isothiourea), accordingly, provides 3 functional groups (mino, imino, and thiol). Thiourea is a lustrous white crystalline compound; estimated melting point is 170-180 C; soluble in water and in polar organic solvents; insoluble in non-polar solvents. The exact melting point and boiling point are not available since rearrangement to ammonium thiocyanate (NH4SCN) occurs at about 135 C and decomposition occurs. It can be prepared by heating ammonium thiocyanate, or by the addition of hydrogen sulfide to cyanamide. The latter is the more common method. Thiourea is used directly in ore filtering, metal refinery and cleaning, isomerization catalyst (conversion of maleic to fumaric acid) and as an additive in fertilizers to (inhibit the nitrification process), drilling auxiliaries, light-sensitive photocopy paper and explosives.  It is used as a fixing agent in photography, as a liquefying agent in animal hide glue, as an insecticide, as a textile-treating agent, and as an intermediate to produce other compounds. Thiourea and its derivatives are versatile intermediates for the synthesis of modified thermosetting resins, thiourea dioxide, dyes, flame retardants, vulcanization accelerators, plant protection agents, pesticides, amino resins, peptizing agents, fungicides, hair preparations, dry cleaning chemicals, corrosion inhibitors and thiazole drugs (e.g., antiseptic, thyrotherapeutic, narcotic, and tuberculostatic agents). Dithiobiurea possesses a wide dipole moment and thus is involved in the forming wide metal chelated complexes as the radioactiv-compound which used in radiopharmaceutical imaging, inhibiting enzyme function, kidney function study and to treat toxic metal poisoning. It is used in co-crystals development used in the field of nonlinear optics to generate new coherent wavelengths.


Formamidine sulfinic acid is a strong reductant. Thiourea Dioxide is used in leather processing industry, paper, pulp and board industry, photographic industry, textile processing industry, bleaching and reducing agents. This product is also a component of decolorisation agents.


The application of Thiourea Dioxide, Formamidine sulfinic acid as reducing agent in the application of sulphur dyes: Thiourea Dioxide, Formamidine sulfinic acid is utilized as reducing agent during the dyeing of cellulosic fibers with about 8 commercial sulphur dyes. The same dyes were also used frow dyebaths containing sodium sulphide. It is discovered that the intensity and fastness properties of the dyeings by both methods are quite similar, although sometimes a little difference in shade are discovered. Researches of the exhausted dyebaths suggests that Thiourea Dioxide, Formamidine sulfinic acid might be considered as a much more environmental friendly substitute for sodium sulphide during the usage of sulphur dyes.


Thiourea Dioxide (Formamidinesulphinic Acid) A New Reducing Agent for Textile Printing: Thiourea Dioxide, Formamidine sulfinic acid is an oxidation product of thiourea. It is considered to be a reducing agent which is very stable both in solid form and in cold aqueous solution. Thiourea Dioxide, Formamidine sulfinic acid has a slight acidic reaction, and acquires full reducing power only when heated in aqueous solution to about 100°C. This paper briefly describes the chemistry of Thiourea Dioxide, Formamidine sulfinic acid, and dealB with it as a reducing agent for vat dyes in the direct and discharge printing of cellulose acetate, silk, and wool. With Thiourea Dioxide, Formamidine sulfinic acid’s acidic properties, these fibers could be printed with a minimum of degradation and great safety of production. Thiourea Dioxide, Formamidine sulfinic acid has been utilized on a practical scale, too.


Certificate of Analysis of Thiourea dioxide

Product Name

Thiourea dioxide, or    Formamidine sulfinic acid







White    crystalline powder


Purity,    %



Thiourea,    %



Sulfate,    %



Iron,    ppm



Moisture,    %




1.Physical and Chemical Properties of Thiourea dioxide, or Formamidine sulfinic acid

Other Name: Formamidine sulfinic acid, Amino imino methanesulfinic acid

Appearance and Odor: White crystal powder, odorless

Formula: CH4N2SO2

Molecular weight: 108.12

Melting Point: 126 C

PH: 4(1% Solution)

CAS No.: 1758-73-2 or 4189-44-0

UN No.: 3341

Dangerous Goods Class: 4.2

Thiourea dioxide, or Formamidine sulfinic acid is one kind of stable compound without oxidablity and reducibity, it can solute in water 26.7g/L(20C), and saturation water solution PH value is 5.0. It’s still stable in 20-30C.

water solution, but Thiourea dioxide, or Formamidine sulfinic acid will decompose under heating and alkali function, drifts away sulfurous acid,

therefore Thiourea dioxide, or Formamidine sulfinic acid manifested a stronger deoxidize activity.

2. Specification:

Purity: 99.%Min Thiourea dioxide, or Formamidine sulfinic acid

Thiourea: 0.10%Max


Iron(Fe):10ppm Max

Sulphate: 0.17%Max


Thiourea dioxide, or Formamidine sulfinic acid is one new kind environmental-protection strong reducing agent which is can be used as exchange of Sodium Hydrosulfite. It has good heat stability, high as reducibility, easy operation and transportation and storage convenient. Thiourea dioxide, or Formamidine sulfinic acid widely applies to reduction dyes and sulfur dyes dyeing, wool and silk bleaching, disperse dyes reducing cleaning, dye vat cleaning and so on. And also used in paper making industry as bleaching agent, deinking, waste paper deink, etc. Moreover, Thiourea dioxide, or Formamidine sulfinic acid is used to organic synthesis in synthetic fiber industry, additive of polythene sensitizer of photographical emulsion, noble metal recycling and separates, etc. There is no pollution during the operation.

4. Packing:

a.500kg or 1000kg jumbo bags.

b.50kg fiber drums.

c.25kg or 50kg woven bags.

d.25kg kraft compound plastic bags or upon customers’ demands.


Storage in dry clean, well-ventilated condition, the warehouse temperature under 30C. Keep

away from moisture and raining.


Top Quality, Pure Thiourea dioxide Powder / substance factory in China; China Thiourea dioxide Powder Raw Material Suppliers in China. China Thiourea dioxide Powder API Manufacturers in China. 

If you are looking for the thiourea dioxide, formamidine sulfinic acid 80%, 90%, 99% cas 1758-73-2, welcome to contact us. We are one of the leading and professional China manufacturers and suppliers in this field. Competitive price and good after-sale service are available.
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