Sodium Metabisulfite Storage — Na2S2O5 SMB Wine Preservative Tank

Storing Sodium Metabisulfite? Start Here

Sodium metabisulfite (SMB) is a versatile chemical used in winemaking, food preservation, and water treatment. It comes as a stable, crystalline solid that dissolves easily in water, making it a practical choice for various applications. It's commonly supplied in bags, drums, and bulk containers. Whether you're using it to preserve wine or treat water, knowing how to store it properly is crucial for safety and effectiveness.

Can you store it in a poly tank?

Yes, you can store sodium metabisulfite in poly tanks. Materials like HDPE, XLPE, and polypropylene are compatible with both the solid and solution forms of SMB. These polyolefins resist the mildly acidic and reducing nature of SMB solutions, making them a reliable choice for storage.

Key Issue: Off-Gassing

One important consideration when storing sodium metabisulfite is off-gassing. When dissolved, SMB can release sulfur dioxide (SO₂) gas, especially if the solution is heated or comes into contact with acids. This can pose respiratory risks and requires proper ventilation and handling procedures to ensure safety.

The safety that actually matters

• Ensure proper ventilation to manage SO₂ off-gassing.
• Use appropriate personal protective equipment (PPE) like gloves and goggles.
• Store in a cool, dry place to prevent unwanted reactions.

Common questions

Can sodium metabisulfite be stored outdoors?

It's best to store it indoors in a controlled environment to prevent moisture absorption and degradation.

What type of gaskets should be used?

EPDM and Viton gaskets are suitable, but always match gaskets to the manufacturer chart for compatibility.

Is it safe to store near food products?

Yes, but ensure containers are sealed and stored in a designated area to prevent contamination.