| Item |
Chinese standard |
Company standard |
| HG/T2826-2008 |
| |
Top-grade |
First grade |
|
| Main content(Na2S2O5) |
96.0 min |
95 |
96.5 |
| Fe %( Fe) |
0.005max |
0.01 |
0.002 |
| Water-Insoluble |
0.05max |
0.05 |
0.02 |
| Arsenic(As) content |
0.0001max |
—— |
0.0001 |
Usage:
1. Chemical industry
Used in the production of insurance powder, sulfamethazine, a caprolactam, etc., as well as the purification of chloroform, phenylpropane sulfone and benzaldehyde. The photographic industry is used as an ingredient in fixers. The perfume industry is used to produce vanillin. Used as a preservative for brewing industry, a rubber coagulant and a bleaching agent for cotton bleaching. Organic intermediates, dyes, and tanning are used as reducing agents for electroplating, wastewater treatment in oil fields, and as a mineralizer for mines.
2. industry
It is used in printing and dyeing, organic synthesis, printing, tanning, pharmaceutical and other departments; as a preservative, bleaching agent and loosening agent in food processing.
3. Used as a chemical reagent
(Printing and dyeing, photography, etc.), used as bleach mordant, reducing agent rubber coagulant, also used in organic synthetic pharmaceuticals and spices.
China
