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Sodium hydrosulfite Featured Image
  • Sodium hydrosulfite
  • Sodium hydrosulfite
  • Sodium hydrosulfite

Sodium hydrosulfite

Sodium hydrosulfite is a versatile reducing agent used in indigo dyeing. It can also serve as a mild alternative to bleach for removing color from dyed fabrics and bleaching antique textiles.

CAS Number：7775-14-6

Molecular Formula：Na₂S₂O₄


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Index

Molar Weight

174.107 g/mol

Appearance

White to off-white granular powder

Odor

Odorless or faint sulfur odor (sulfur dioxide odor)

pH

(50 g/L, 20°C) 5.5–8.5

Melting Point

52°C

Properties

Sodium hydrosulfite has unique chemical properties. It is extremely unstable in aqueous solution and readily decomposes into sodium sulfate, sodium sulfide, and sulfur dioxide. This compound has a melting point of 300°C and a boiling point of 1390°C, and is relatively stable under dry, low-temperature conditions. However, it is highly sensitive to moisture and air, which accelerate its decomposition.

Applications

• Textile Industry: It can be used as a reducing agent in the dyeing process, allowing dye molecules to penetrate the fabric more effectively. It also serves as a bleaching agent for cotton and silk, enhancing the brightness and transparency of textiles.

• Paper Industry: Sodium bisulfite is the preferred bleaching agent for mechanical pulp, thermomechanical pulp, and deinked pulp, significantly improving the whiteness and quality of paper products.

• Food Industry: As a food additive, it serves as a bleaching agent and antioxidant for candied fruits, dried vegetables, noodles, and grapes. It helps preserve food color and extend shelf life.

• Environmental Engineering: In wastewater treatment, sodium metabisulfite reduces harmful substances, contributing to the discharge of cleaner, safer water.

• Chemical Industry: It acts as a reducing agent in the synthesis of thiourea and its sulfides, playing a crucial role in various chemical reactions.

Packaging

Packaged in iron drums or plastic bags, with net weights ranging from 15 to 200 kg. Available in 20/50 kg drums and 250 g double-sealed plastic zipper bags.

Sodium Hydrosulfite详情图1
Sodium Hydrosulfite详情图2

Storage

Store in a dry, cool, well-ventilated area at temperatures between +5°C and +30°C. To prevent chemical reactions, avoid contact with strong acids, oxidizing agents, water, and moisture. When handling the powder, wear gloves, a dust mask, and safety goggles. Keep this product out of reach of children and pets.

Transportation

As this product is sensitive to moisture and air, which may lead to the release of sulfur dioxide (SO₂), appropriate safety measures should be taken during transportation.

Synonyms

Sodium Dithionite

Insurance Powde

Dithionous acid

Disodium salt

Blankit

Blankit IN

Burmol

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