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Sodium Hydrosulfite Storage — Na2S2O4 Dithionite Reducing-Agent Tank Selection

Storing Sodium Hydrosulfite? Start Here

Sodium hydrosulfite, also known as sodium dithionite, is a powerful reducing agent widely used in industries like pulp and paper, textiles, and ceramics. It comes as an off-white to pale-yellow crystalline solid and is commonly stored in steel or fiber drums. This chemical is highly effective for brightening pulp, reducing vat dyes, and brightening kaolin clay. However, it poses risks such as self-heating and spontaneous combustion when exposed to moisture or air. Proper handling and storage are crucial to maintain safety and effectiveness.

Can you store it in a poly tank?

Yes, sodium hydrosulfite solutions can be stored in polyethylene tanks. HDPE or XLPE tanks are standard for preparing and storing solutions for short durations. However, long-term storage of solutions is not recommended due to decomposition. For solid storage, use sealed carbon-steel drums.

Key Issue: Moisture Sensitivity

Sodium hydrosulfite is highly sensitive to moisture, which can lead to self-heating and spontaneous combustion. Always store the solid form in a dry, cool, and well-ventilated area to prevent these risks. Solutions should be prepared just before use to avoid decomposition.

The safety that actually matters

  • Store solid sodium hydrosulfite in sealed, dry containers to prevent moisture exposure.
  • Prepare solutions immediately before use to minimize decomposition risks.
  • Use appropriate gaskets and fittings, such as EPDM, for compatibility and safety.

Common questions

Can sodium hydrosulfite be stored long-term in solution form?
No, solutions should not be stored long-term as they decompose. Prepare solutions just before use.
What materials are suitable for storing sodium hydrosulfite solutions?
HDPE or XLPE tanks with EPDM gaskets and PVC piping are standard for short-term solution storage.
What precautions should be taken for solid sodium hydrosulfite storage?
Store in sealed carbon-steel drums in a dry, cool, and well-ventilated area to prevent moisture exposure and combustion risks.

Sodium Hydrosulfite storage tanks from OneSource

For sodium hydrosulfite storage, specify HDLPE_OR_XLPE rated to specific gravity 1.9. Verified, compatibility-matched options:

Confirm chemical compatibility and a ZIP freight quote with our team at 866-418-1777.

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Sources & References

All compatibility ratings, hazard classifications, and chemical identifiers on this page are sourced from authoritative third-party publications. Verify against the original references before final specification.

  1. PubChem Compound Database — entry for Sodium Hydrosulfite (CID 24489, CAS 7775-14-6). pubchem.ncbi.nlm.nih.gov. National Library of Medicine / NCBI. Canonical chemical-identity reference.
  2. Snyder Industries Chemical Resistance Recommendations — system-of-construction guidance for polyethylene chemical-storage tanks at industrial ASTM 1.9 SG design rating. SNY-3041 Chemical Resistance Chart. Snyder Industries, current edition. Resin + fitting + gasket + bolt MOC matrix.
  3. Equistar Technical Tip — Chemical Resistance of Polyethylene — LDPE / MDPE / HDPE rating chart by concentration and temperature, distributed by Enduraplas. enduraplas.com (PDF). Equistar polyethylene resin chemical-resistance data, distributed via Enduraplas.
  4. NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response. nfpa.org. NFPA 704 'fire diamond' health/flammability/instability/special-hazard rating system (0–4 scale).
  5. UN Globally Harmonized System of Classification and Labelling of Chemicals (GHS), current revision. unece.org/transport/ghs. GHS pictograms, signal words, and H-statement codes referenced in this guide.
  6. ASTM D1998 — Standard Specification for Polyethylene Upright Storage Tanks, current edition. astm.org. Cited as the design-specific-gravity standard (typically 1.9 SG) for industrial chemical-service polyethylene tanks.
  7. NIOSH Pocket Guide to Chemical Hazards — occupational exposure limits, PPE, and IDLH data for Sodium Hydrosulfite. cdc.gov/niosh/npg. CDC / NIOSH chemical-specific occupational-safety reference.

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