Sodium Hydrosulfite is a kind of white sand crystal or light yellow powder chemical products, melting point 300℃ (decomposition), ignition temperature 250℃, insoluble in ethanol, soluble in sodium hydroxide solution, strong reaction and combustion in water.

Specification Standard Result
Purity(wt%) 88min 88.78
Na2CO3(wt%) 2.5­3.0 2.72
Na2S2O3(wt%) 0.5­1 0.56
Na2S2O5(wt%) 5 ­ 7 6.68
Na2SO3(wt%) 0.5­1.5 0.63
Fe(ppm) 20ppm max 16ppm
Water lnsoluble 0.1 0.04
Total other heavy metals 10ppm max 8ppm

Sodium Hydrosulfite Usage

1, widely used in the textile industry, used as reducing agent for reducing dye dyeing, reducing bleaching agent, reducing dye printing aid, silk refining and bleaching agent, stripping agent for dyeing and cleaning agent for dyeing VAT;

2, widely used in paper industry, used as mechanical pulp, hot grinding mechanical pulp and deinking pulp bleaching agent. It is the most suitable for wood pulp paper bleaching agent;

3, as a reduction bleaching agent, is widely used in the bleaching of kaolin, fur bleaching and reduction whitening, bamboo products and straw products bleaching;

4, used in mineral processing, thiourea and its sulfide synthesis;

5. Used as reducing agent in chemical industry;

6, food additives are mainly used in the food industry, widely used in preserves, dried fruits, dried vegetables, vermicelli, grapes.