Anhydrous sodium sulfite

Anhydrous sodium sulfite (Na₂SO₃) is a white crystalline powder with strong reducing properties; it is readily soluble in water, forming an alkaline solution. It is widely used in the textile printing and dyeing, papermaking, food processing, and chemical industries, commonly serving as a deoxidizer, bleaching agent, and preservative.

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Basic properties

1. Appearance: White powder or fine crystals.

2. Solubility: Readily soluble in water; insoluble in ethanol.

3. Stability: More stable than hydrated sodium sulfite, but gradually oxidizes to sodium sulfate upon prolonged exposure to air. Decomposes upon contact with acids, releasing toxic sulfur dioxide gas.

Important notes

1. It is mildly irritating; rinse with clean water if it comes into contact with the skin or eyes.

2. Store in a sealed container protected from moisture and away from acids to prevent clumping due to dampness or the release of sulfur dioxide upon contact with acids.

Technical parameters

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NA2SO3 CONTENT: