Sodium Hydrosulfite , commonly known as Sodium dithionite, also known as sodium hyposulfate, is a strong reducing agent in two forms: dihydrate salt and anhydrous salt. Dihydrate is a slightly yellow flake like crystal with extremely unstable chemical properties, only present in alkaline solutions. When heated to a certain temperature, it is dehydrated and converted into anhydrous salts; Anhydrous salt is a white crystalline powder that exists stably when dried at room temperature.

Product Name: Sodium hydrosulphite, Sodium Dithionite, Sodium hydrosulfite

Quality standard: HG / T 2074 - 2011

Molecular formula: Na2S2O4

UN NO.: 1384

IMO Class: 4.2

Sodium hydrosulfite powder is widely used in reductive dyeing, reductive cleaning, printing and decolorization of textile industry and bleaching of fabrics such as silk, wool and nylon. Because it does not contain heavy metals, the bleached fabrics have bright color and are not easy to fade. Sodium hydrosulphite powder can also be used in organic synthesis, such as reducing agent or bleach in the production of dyes and drugs. It is suitable for bleaching of wood pulp and paper, and can also be used to preserve food and fruits.

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Even disulfite sodium belongs to a class of wet flammable goods, also known as low sodium sulfite.The products are na2s2o4.2h2o and Na2S2O4.The former is white fine crystal, while the latter is light yellow powder.Relative density 2.3-2.4, decomposed in red heat, soluble in cold water, decomposed in hot water,

1. Properties: white sand crystal or light yellow powder
2. The melting point (ºC) : 52 ~ 55 (decomposition)
3. The boiling point (ºC) : 130 (decomposition)
4. Relative density (water =1) : 2.1~2.2
5. The ignition temperature (ºC) : 250
6. Solubility: soluble in water.

Application of Na2S2O4 Sodium Hydrosulfite SHS 
1. Widely used in textile industry for vat dyeing, reduction cleaning, printing and stripping, textile textile bleaching .
2. It is also used in bleaching paper pulps , especially mechanical pulps, it's the most fittable bleaching agent in pulps. 
3. It is used in bleaching kaolin clay, fur bleaching and reductive whitening, bleaching of bamboo products and straw products, 
4. It is used in mineral, the compound of thiourea and other sulphides. 
5. It is used as reducing agent in chemical industry.
6. Sodium hydrosulfite food additive grade is used in foodstuffs, as bleaching agent