Sodium Metabisulfite CAS 7681-57-4

Sodium Metabisulfite is an inorganic compound that appears as a white or slightly yellowish crystalline powder with a slight odor of sulfur dioxide. It is highly soluble in water, forming an acidic solution. As a strong reducing agent, it is chemically active and readily oxidizes to sodium sulfate when exposed to moist air. Our product is produced using advanced chemical synthesis processes to ensure high purity (≥96.5%) and low impurity content, making it suitable for demanding applications in water treatment, mining, and textile processing.

Physicochemical Properties

Applications

1. Water Treatment: Used effectively for dechlorination (removing excess chlorine) in reverse osmosis (RO) systems and for the reduction of hexavalent chromium to trivalent chromium in wastewater.
2. Mining & Mineral Processing: Acts as a depressant and flotation agent in the mining industry, particularly in the extraction of gold and processing of copper/lead/zinc ores.
3. Textile & Dyeing: Serves as a bleaching agent for wool and cotton, a dechlorinating agent after bleaching, and a mordant in the dyeing industry.
4. Paper Industry: Used for bleaching paper pulp to improve brightness.
5. Chemical Synthesis: utilized in the production of sulfones and resins; used as a reducing agent in organic synthesis.
6. Food Industry (Food Grade): Used as a preservative, antioxidant, and color fixative in processed foods to prevent browning and spoilage.

Storage Conditions

• Environment: Store in a cool, dry, and dark warehouse (below 25°C is ideal).
• Air Exposure: The product oxidizes easily. Keep containers tightly closed when not in use.
• Incompatibility: Store separately from oxidants, strong acids, and direct heat sources. Never store with acids as toxic sulfur dioxide gas will be released.
• Shelf Life: typically 12-24 months if stored correctly in unopened original packaging.

Safety Precautions

• Respiratory Protection: Wear a dust mask or respirator. Inhalation of dust or gas (SO2) can irritate the respiratory tract and cause asthma-like symptoms.
• Skin & Eye Protection: Wear protective gloves, safety goggles, and protective clothing to prevent contact. It causes irritation to eyes and skin.
• Handling: Use in a well-ventilated area. Avoid generating dust.
• Emergency: In case of contact with eyes, rinse immediately with plenty of water for at least 15 minutes and seek medical advice.