Products / Sodium Hydrosulfite

Sodium Hydrosulfite

Na₂S₂O₄

Gulshan Sodium Hydrosulfite is a white, free flowing and crystalline powder that is low dusting and readily soluble in water. It exhibits strong reducing action in aqueous solutions and is highly stable when kept in a dry, clean container away from heat.

White sodium hydrosulfite powder in a glass dish beside laboratory flasks

Properties

Chemical formula: Na₂S₂O₄
Molecular weight: 174.10
Bulk density: 0.9–1.0 g/cc
Solubility in water, 20 °C: 190 g/litre
CAS number: 7775-14-6
HS code: 28321020

Specifications

Two grades

Parameter	Unit	Limit	Concentrate	Standard
Assay% w/w, Min	% w/w	Min	88	85
Na₂S₂O₅Sodium metabisulfite% w/w, Max	% w/w	Max	6.0	6.0
Na₂S₂O₃Sodium thiosulfate% w/w, Max	% w/w	Max	0.6	0.6
Na₂CO₃Sodium carbonate% w/w, Max	% w/w	Max	2.0	6.0
HCOONaSodium formate% w/w, Max	% w/w	Max	1.0	1.0
FeIronppm, Max	ppm	Max	20	20
ZnZincppm, Max	ppm	Max	1	1

Blue denim jeans hanging against a yellow wall

Packaging

50 kg and 100 kg steel drums with inner polyethylene bag

Applications

What it is used for

Textiles

Reduction agent for vat-dyeing cotton fibers and blends.
Reduces and eliminates colors not absorbed in polyester fibers.
Reduction agent for stripping colorants from textile fibers and in cleaning dyeing equipment.

Pulp and paper

Bleaching agent for mechanical and thermo-mechanical pulp.
Bleaching agent for deinking recycled paper.

Others

Bleaching agent for sugarcane, glues, gelatins, soaps, oils and clay.
Reducing or bleaching agent in production of dyestuffs and pharmaceuticals.
Reduction of hexavalent chromium to trivalent state for effluent treatment.

Storage

Keep drums away from moisture, water, heat, acids and oxidizers to avoid hazards.

Decomposition caused by heat or contaminants may release sulfur dioxide and other toxic gases, which are extremely hazardous to human health.

Safety precautions

In case of fire, use sand, or a fire extinguisher with abundant quantities of water to dissolve the powder and dissipate heat. When possible, the product should be spread out before water is used.

Water in large quantity is the only effective extinguishing agent for a sodium hydrosulfite fire.

In case of contact with eyes or skin, flush thoroughly with water.

Ask for a quotation or a technical data sheet

Tell us the grade and quantity you need. We also make Sodium Sulfite.

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