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Sodium metabisulfite is a white or yellow crystalline powder or small crystal with a strong SO2 odor, a specific gravity of 1.4, soluble in water, and the aqueous solution is acidic. When it is in contact with a strong acid, it releases SO2 to form a corresponding salt. When it is left in the air, it oxidizes. It is Na2S2O6, so the product cannot be stored for a long time. Above 150 degrees Celsius, SO2 is decomposed.
Sodium Metabisulfite
Other name:Sodium pyrosulfite
Quality standard:FCCV/E223/USP
CAS NO.:7681-57-4
HS CODE:28321000
M.F.:Na2S2O5
Specification:Industry grade/Food grade
Appearance:White crystalline powde
| ITEM | TEST RESULT |
| Appearance | White crystalline powder |
| Sodium Metabisulphite (Na2S2O5) % | 97.21 |
| SO2 % ≥ | 65 |
| Fe % ≤ | 0.002 |
| Clarity | clear |
| Insoluble matter in acid% ≤ | 0.009 |
| AS% | <0.00009 |
| Phosphori acid test ≤ | 4.2 |
| Appearance | White to slightly yellowish crystialline powder |
Sodium sulfite has several applications as an antioxidant, a preservative and as a disinfectant. Some important uses of this compound are listed below.
Industrial Grade:
Industrial grade sodium metabisulfite is used in a wide range of applications:
Rubber: a coagulant.
Printing and dyeing: as a dechlorination agent for bleached cotton.
Leather: impart leather the properties of soft, waterproof, folding resistance in leather treatment.
Surfactants and polymerization: as a sulfonating agent and reducing agent.
Gold refining: as a reducing agent to precipitate gold out of an solution by reducing the Au3+ to Au.
Food Grade:
sodium metabisulfite is used in a wide range of applications:
Since sulfite is a strong reducing agent, it reacts with oxygen from fruits and vegetables and also inhibits oxidase activity, so it prevents food spoilage caused by oxidation and protects vitamin C in them.
BEIJING MUGU TECHNOLOGY CO., LTD are specialized in the production and distribution of food packaging products and food additives. We are dedicated to providing high-quality solutions that meet the needs of the food industry, offering sustainable and innovative packaging options, as well as a range of food-safe additives to enhance product preservation and quality. Our goal is to support businesses in delivering safe, reliable, and eco-friendly packaging solutions that contribute to the sustainability and quality of food products globally.
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Food preservation: Sodium Metabisulphite, Sodium Benzoate, Calcium Propionate...
