Alias: Sodium Hydrosulfite
Molecular Formula: Na2S2O4
English Name: Sodium Hydrosulfite, Sodium dithionite
Appearance: White crystalline powder
Relative Density (water=1): 1.02
UN Number: 1384
Chemical Stability: Stable at room temperature in a closed container when handled and stored as recommended.
Possibility of Hazardous Reactions: Can burn when heated or in contact with an open flame. Deteriorates when oxidized in air. Contact with water, acids, or organic materials and oxidizers can release a large amount of heat, leading to intense combustion.
Conditions to Avoid: Capable of self-heating.
Incompatible Materials: Strong oxidizers, etc.
Hazardous Decomposition Products: Combustion products include sulfur oxides (SOx). Uses: Used as a dyeing assistant for cotton fabrics and a bleaching agent for cotton and wool textiles. Also used in pharmaceuticals, mineral processing, copperplate printing, and the synthesis of thiourea and other sulfides. Additionally employed as a bleaching agent in the paper industry, and food-grade products are used as bleaching agents, preservatives, and antioxidants.
| ITEM | STANDARD |
| Hydrosulphite | 74% | 85% | 88% | 90% |
| Water insoluble | 0.3max | 0.3max | 0.1max | 0.1max |
| Sodium thiosulfate: Na2S2O3 | 1.4max | 1.5max | 1.3max | 1.0max |
| Sodium metabisulfite:Na2S2O5 | 5-7 | 5-7 | 5-7 | 5-7 |
| Sodium bisulfite:NaHSO3 | 0.5max | 0.5max | 0.5max | 0.5max |
| Sodium carbonate: Na2CO3 | 0.6-2max | 0.6-2max | 0.6-2max | 0.6-2max |
| Sodium formate: HCOONa | 0.5max | 0.8max | 0.5 max | 0.5max |
