CAS NO. :7681-57-4
EINECS NO.: 231-673-0
Synonyms:Sodium metabisulfite
Chemical formulate:Na2S2O5
Sodium metabisulfite (Na2S2O5) is an inorganic compound that appears as white or yellow crystals with a strong pungent odor. Dissolved in water, the aqueous solution is acidic, and upon contact with strong acids, it releases sulfur dioxide and generates corresponding salts. If left in the air for a long time, it will oxidize into sodium sulfate, so sodium hydrosulfite cannot be stored for a long time.
Used for the production of insurance powder, sulfamethoxazole, metamizole, caprolactam, etc; Used for the purification of chloroform, phenylpropanol sulfone, and benzaldehyde. Ingredients used as fixing agents in the photographic industry; The spice industry is used to produce vanillin; Used as a preservative in the brewing industry; Rubber coagulants and dechlorination agents for bleached cotton fabrics; Organic intermediates; Used for printing and dyeing, leather making; Used as a reducing agent; Used for wastewater treatment in the electroplating industry, oil fields, and as a mineral processing agent in mines; Used as preservatives, bleaching agents, and loosening agents in food processing.
Used as bleach, mordant, reducing agent, rubber coagulant, also used in organic synthesis, pharmaceutical and fragrance
Packing: 25kg plastic woven bag or 1000kgs jumbo bag
TESTS |
STANDARD |
RESULTS |
APPEARANCE |
WHITE CRYSTALLINE POWDER |
|
CONTENT |
96.5% MIN |
97.2% |
SO2 |
65% MIN |
65.5% |
Fe |
0.002% MAX |
0.0015% |
WATER INSOLUBLE |
0.02% MAX |
0.015% |
PH VALUE |
4.0-4.8 |
4.4 |
HEAVY METAL ( Pb) |
0.0005% MAX |
0.0002% |
As |
0.0001% MAX |
0.00006% |