Sodium Dithionite / Sodium Hydrosulfite

Other Trading Names:

  • Sodium hydrosulfite

CAS Number: 7775-14-6

HS Code: 2831101000

Types of Packaging:

  • 50kg iron drums
Inquiry right-arrow $974.00
Availability: In stock
Sodium Dithionite

Request FREE Quotation


Chemical Name

Sodium dithionite


85% 88% 90%

Molecular Formula


CAS Number



White Powder

Grade Standard

Food Grade, Industrial Grade


Water Soluble

Melting Point


Boiling Point



2.13 g/cm³

Chemical Description 

  • Sodium Dithionite (SD), also known as Sodium Hydrosulfite, is a white crystalline powder or granular compound with the chemical formula Na2S2O4. It is renowned for its powerful reducing properties and is highly soluble in water, making it a versatile agent in various industrial processes.
  • In the textile industry, Sodium Dithionite is widely used as a reducing agent in vat dyeing, facilitating the application of water-insoluble dyes to fabrics by rendering them water-soluble. It is also employed in the bleaching of textiles, where it removes unwanted pigments without harming the fabric.
  • The paper industry utilizes Sodium Dithionite for bleaching mechanical and recycled pulps, enhancing the brightness and overall quality of the paper.
  • It plays a crucial role in the kaolin clay industry by bleaching the clay to improve its whiteness and purity, which is essential for high-quality ceramics and paper products.
  • In the realm of food preservation, Sodium Dithionite acts as an oxygen scavenger, preventing oxidative spoilage in a variety of food items and extending their shelf life.
  • The leather processing sector employs Sodium Dithionite in the bleaching and de-sulfurizing of leather, preparing it for further treatment and dyeing.
  • It is an effective agent for water treatment, capable of removing heavy metals and other contaminants through reduction, contributing to safer and cleaner water.
  • Sodium Dithionite is utilized in mineral processing to separate and recover valuable minerals from ores, enhancing the efficiency and effectiveness of the mining industry.
  • Due to its strong reducing properties, it is involved in chemical manufacturing processes, serving as a reagent in the synthesis of various chemicals and compounds.
  • The environmental applications of Sodium Dithionite include its use in the detoxification of industrial wastes and effluents, reducing harmful substances to less toxic forms.
  • Its role extends to the photography industry, where it is used in photographic film development, and in analytical chemistry as a reagent for laboratory analyses.
  • Despite its versatility and utility, handling Sodium Dithionite requires caution due to its potential to decompose upon exposure to air or moisture, releasing sulfur dioxide, a hazardous gas. Proper storage and handling practices are essential to ensure safety and preserve its quality.
Write Your Own Review
You're reviewing:Sodium Dithionite / Sodium Hydrosulfite
(Size: 152.8 KB)
* You have to Login or Register to download this file.

Quote Request Form

Sodium Dithionite / Sodium Hydrosulfite