China factory wholesale quality sodium pyrosulfite nice price for sale
| 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.
Product quality protection 
