Sodium metabisulfite

Sodium metabisulfite (chemical formula: Na₂S₂O₅) is a white or slightly yellowish crystalline powder with a strong odor of sulfur dioxide. Possessing strong reducing properties, it is widely used in the food, pharmaceutical, and industrial sectors as a preservative, antioxidant, bleaching agent, and disinfectant.

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Technical parameters
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Product Description

Basic properties

1. Appearance: White or slightly yellowish crystalline powder.

2. Odor and Solubility: Strong sulfur dioxide odor; readily soluble in water; aqueous solution is acidic.

3. Chemical Properties: Strongly reducing; releases sulfur dioxide gas upon contact with strong acids; easily oxidized to sulfate when exposed to air.

Technical parameters

Quality specification
Iterm	FOOD GRADE Specification	FOOD GRADE Result	Industry GRADE Specification	Industry GRADE Specification
Main content (calculated as Na2S2 O5 ), %	≥96.5	97.5	≥96.5	97.1
Main content (calculated as SO2), %	/	/	≥65	65.4
Water insoluble matter, %	/	/	≤0.05	0.03
Iron (Fe),%	≤0.003	0.0021	≤0.005	0.0022
Arsenic (As),%	≤0.0001	0.0001	≤0.0001	0.0001
PH Value (5% solution)	/	/	4.0 - 4.6	4.5
Appreance	Crystal Powder with White or Pale Yellow	Qualified	Crystal Powder with White or Pale Yellow	Qualified
Conclusion	Qualified

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Product Name: Sodium metabisulfite

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