Skip to main content

Potassium Iodide Storage — KI Tank System Selection

Storing Potassium Iodide? Start Here

Potassium iodide (KI) is a versatile chemical used in various fields, from public health to photography. It's a white-to-colorless crystalline solid that dissolves easily in water. When storing KI, it's important to keep it away from light to prevent it from turning into iodine, which can stain surfaces. KI is typically stored in amber glass or opaque HDPE containers to protect it from light exposure.

Can you store it in a poly tank?

Yes, you can store potassium iodide in poly tanks. Materials like HDPE, XLPE, and PP are suitable for storing KI solutions, as they resist the chemical well. Just make sure the tank is opaque to minimize light exposure, which can cause the iodide to slowly release iodine.

Key Issue: Light Sensitivity

Potassium iodide is mildly light-sensitive. When exposed to light, it can slowly release iodine, which may stain equipment and alter the solution's chemical properties. Using opaque storage tanks helps maintain the integrity of the KI solution.

The safety that actually matters

  • Store in opaque containers to prevent light exposure.
  • Ensure proper ventilation to avoid inhalation of any fumes.
  • Wear protective gear when handling to prevent skin and eye irritation.

Common questions

Can potassium iodide be stored outdoors?
Yes, but ensure the tank is opaque and protected from direct sunlight.
What type of gaskets should be used?
Match gaskets to the manufacturer chart for compatibility.
Does KI need temperature control during storage?
Not typically, but avoid temperatures below 30°F to prevent crystallization.

Potassium Iodide storage tanks from OneSource

For potassium iodide 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.

Designing the storage system, not just picking a tank?

Vendor-neutral engineering guides from our custom fabrication team - material of construction, containment, and code, matched to your chemistry.

Explore: FRP & Fiberglass Tanks  ·  Double Wall Tanks  ·  Solvent Recovery  ·  Custom Fabrication Hub

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 Potassium Iodide (CID 4875, CAS 7681-11-0). 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 Potassium Iodide. cdc.gov/niosh/npg. CDC / NIOSH chemical-specific occupational-safety reference.

!