Calcium sulfite dihydrate
【Physical property】White crystalline powder, can be made into balls. Soluble in sulfurous acid, sulfur dioxide. Slightly soluble in water and ethanol. It gradually oxidizes in the air to calcium sulfate.
| Test items | High purity | Other |
| Assay(CaSO3·2H2O) /% | ≥99.0 | Costom |
| Hydrochloric acid insoluble /% | ≤0.1 | |
| Iron(Fe) /% | ≤0.02 | |
| Heavy metals (as Pb) /% | ≤0.001 | |
| Arsenic(As) /% | ≤0.000 2 |
【Use】A dechlorination agent for bleaching fabrics; Decolorizing agent; Used as an analytical reagent; It is also used in papermaking and sugar industry.