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Citric Acid Storage — Saturated Food-Grade Tank System Selection

Storing Citric Acid? Start Here

Citric acid is one of the friendliest chemicals on this whole site to store. It's the food, beverage, and clean-in-place (CIP) workhorse, and a standard chemical-grade poly tank handles it with a simple, food-friendly setup. Short answer: yes, poly works great — here's the quick spec.

Can you store it in a poly tank? Easily.

Saturated citric acid solution is compatible with HDPE/XLPE chemical-service tanks (1.9 SG). Use EPDM gaskets, PVC or polypropylene fittings, and 316 stainless bolts. EPDM is the right gasket here (not Viton), and food-grade NSF-61 EPDM formulations are easy to get.

For food, beverage, or drinking-water use, specify food-grade acid and an NSF/ANSI 61 tank where it contacts product or finished water.

The safety that actually matters

Citric is a mild organic acid — far gentler than the mineral acids — but it's still an acid: wear eye protection, and give the tank a spill basin sized to 110%. A simple atmospheric vent is all it needs.

Common questions

What gaskets for citric acid?
EPDM — food-grade NSF-61 EPDM is the standard. PVC or PP fittings, 316 stainless bolts.
Is it food/beverage safe in poly?
Yes, with food-grade acid and an NSF/ANSI 61 tank. It's used constantly in food and beverage CIP.
Does it need special handling?
No — it's one of the easiest. Just standard acid PPE and 110% containment.

Citric Acid storage tanks from OneSource

For citric acid storage, specify HDLPE 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.

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 Citric Acid (CID 311, CAS 77-92-9). 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 Citric Acid. cdc.gov/niosh/npg. CDC / NIOSH chemical-specific occupational-safety reference.

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