Sodium Hydrosulfite


Sodium hydrosulfite

Sodium hydrosulfite is a very effective reducing agent. Our sodium hydrosulfite comes in solid white crystalline powder form.

Designed for flexible volume usage, solid sodium hydrosulfite can be transported easily and stored for an extended period of time. It has wide applications in various industries, including textile, pulp and paper, Kaolin clay, and water treatment.

Flexible yet safe

Sodium hydrosulfite is highly stable if stored and kept carefully. Our solid hydrosulfite has a shelf life of over 12 months. We provide a wide variety of packaging, 50KG drums, 100KG, 200KG to 1,800MT Intermediate Bulk Containers (IBC). We give you the option to choose the most appropriate packaging to minimize package handling and air exposure. All our solid hydrosulfite comes with inner liners as an extra precaution against moisture and water.

Patented Innovative bulk packaging

Designed for volume users, our UN-approved IBC pioneered the industry’s first patented bulk packaging for marine transportation. Key benefits of the IBC include

  • Safety - Unique inner liners prevent moisture and water
  • Convenience - Designed for easy mechanical operation by forklift
  • Dust free and odorless - The liners trap all powder and odor when the bag is emptied
  • No packaging material handling - All packaging materials, include drums and liners, can be returned to us.

Common Applications

Sodium hydrosulfite is commonly used in the pulp and paper industry for bleaching brightening and de-colorization of virgin and recycled fiber. It is also applied extensively to brighten Kaolin clay. In textiles, the primary usage is in processing vat dyes and indigo dyes. Other applications include water treatment, leather processing and food bleaching (sugar, honey and gelatin).

Product specifications

  Na2S2O4 90 Grade 88 Grade 85 Grade
  Water Insolubles 90% 88% 85 %
  Shelf Life (months) 12 12 12
  Fe (ppm) 0.05% 0.05% 0.05%
  Zn (ppm) 20 20 20
  Other heavy metals such as Pb (ppm) 1 1 1


Our solid sodium hydrosulfite is highly stable when stored in dry closed containers. However, solid sodium hydrosulfite is a very reactive chemical which can decompose when exposed to air and moisture or in contact with small amount of water. Decomposition will result in spontaneous ignition and liberation of toxic SO2. The chemical reacts violently with oxidants and will explode or combust.

Storage and handling

Our product must be always handled and stored in sealed clean iron drums or bulk containers. Avoid contacts with moisture, acids, oxidizing chemicals and combustible organic substances. Protect it from heat, direct sunlight, sparks and naked flames. Avoid damaging the packaging.

In the event of fire, use large quantities of water to extinguish the product. Other extinguishing media may not stop decomposition thoroughly. For details, please refer to the updated MSDS.

Material Safety Data Sheet (MSDS)

Please download our latest Material Safety Data Sheet

To view the PDF files you will require the Adobe Acrobat Reader plug-in. If you do not have the reader installed, please click here or on the icon below to download a free copy of the Acrobat Reader.

Make an Inquiry

© 2002 AZ Chemicals, Inc. All rights reserved.