Thiourea Dioxide

Other Trading Names:

  • Thiox
  • Amidinosulfinic acid
  • Formamidine Sulfinic Acid

CAS Number: 1758-73-2

HS Code: 29309070

Types of Packaging:

  • 25 kgs/Bag
Inquiry right-arrow $1,849.00
Availability: In stock
Thiourea Dioxide

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Chemical Name

Thiourea Dioxide



Molecular Formula


CAS Number



white crystal powder

Grade Standard

Industrial Grade


Miscible with most organic solvents, Soluble in water

Melting Point

124-127 °C (dec.)(lit.)


1.68 g/cm³

Chemical Description

  • Thiourea Dioxide (TDO), also known as formamidine sulfinic acid, is a compound with the molecular formula CH4N2O2S. It appears as a white crystalline powder and is known for its reducing properties without the liberation of hydrogen sulfide gas, making it an eco-friendly alternative to traditional reducing agents.
  • In the textile industry, TDO is extensively used in the vat dyeing, reduction cleaning, printing, and stripping of fabrics. It aids in the removal of unwanted dyes without damaging the fabric, contributing to brighter and more consistent colors.
  • In paper manufacturing, Thiourea Dioxide serves as a pulp bleaching agent. It allows for the production of high-brightness paper while minimizing the environmental impact compared to chlorine-based bleaching processes.
  • The leather processing industry utilizes TDO for reductive unhairing, facilitating a more sustainable and less toxic alternative to traditional sulfur and lime processes.
  • In photography, Thiourea Dioxide is employed as a toner or redeveloper. It alters the color or increases the density of photographic prints, offering a range of aesthetic finishes.
  • TDO is also used in the synthesis of polymers, where it acts as a reducing agent in polymerization reactions. This role is crucial for developing specific polymer structures and properties.
  • The product's low toxicity and biodegradability, combined with its reducing power, make Thiourea Dioxide a valuable chemical in various applications seeking greener and safer alternatives to conventional reducing agents.
  • TDO's lower toxicity compared to other reducing agents like sodium hydrosulfite makes it a preferred choice in environments where worker safety is paramount. Its stability under normal storage conditions, coupled with its non-hazardous decomposition products, enhances its safety profile.
  • Despite its stability, care should be taken to store TDO in cool, dry places away from sources of moisture and direct sunlight. Proper handling and storage practices ensure its effectiveness and minimize the risk of decomposition before use.
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Thiourea Dioxide