The Chem-Tainer 120 Gallon Vertical Double Wall Chemical Storage Tank (SKU TC3345DC) packages primary containment and built-in secondary containment in one polyethylene unit, so a single tank covers both the working volume and the catch basin a chemical install needs. It stands 45 inches tall on a 33 by 33 inch footprint, holding 120 gallons in natural white polyethylene with a 2.0 specific gravity rating. That 2.0 rating is the number to anchor on: it tells you exactly how heavy a liquid this tank wall is built to carry.
Will it work for your liquid
Filled with plain water this tank carries roughly 1,001 pounds; loaded to its full 2.0 SG rating it is engineered for up to about 2,002 pounds of contents. The 2.0 specific gravity rating is what makes this a true chemical tank rather than a water vessel, giving engineering headroom for dense liquids that a 1.0 or 1.5 SG tank is not rated to carry. Note that the rating ceiling matters most for heavy liquids: 98% sulfuric acid (roughly 1.84 SG) and 50% ferric chloride (roughly 1.4 SG) both sit comfortably under the 2.0 ceiling with margin to spare. For light fluids on the compatible list, like DEF, the glycols, and urea solution, the 2.0 rating is comfort margin rather than a requirement, since those would run fine in a lower-rated tank. Match your chemical's specific gravity at its stored concentration to the 2.0 ceiling, and confirm your fitting and gasket materials against the chart below. The natural white wall lets you eyeball the liquid level through the tank, and the 33 by 33 inch footprint helps when you are laying out a contained chemical pad. This is the double wall vertical storage tank buyers search for when they need integral secondary containment without pouring a separate berm.
Chemical compatibility
This is a polyethylene tank with a 2.0 SG rating. The resin is recorded as HDLPE but flagged unconfirmed - confirm HDLPE versus XLPE with us at 866-418-1777 before committing this tank to chemical service, because crosslinked and linear polyethylene differ in chemical resistance. Always verify your specific chemical, at your concentration and temperature, against the manufacturer chemical-resistance chart; the values below are concentration-specific and assume the listed fitting and gasket materials.
Chemicals this tank is rated to store, with the recommended fitting and gasket materials at the noted concentration:
- Acetic Acid (60%) - PP/PVC fittings, EPDM gaskets
- Aluminum Sulfate (50%) - PVC fittings, EPDM gaskets
- Calcium Chloride (40%) - PVC fittings, EPDM gaskets
- DEF (32.5%) - 316SS fittings, EPDM gaskets
- Ethylene Glycol (100%) - PVC fittings, EPDM gaskets
- Ferric Chloride (50%) - PVC fittings, EPDM gaskets
- Ferric Sulfate (60%) - PVC fittings, EPDM gaskets
- Ferrous Sulfate (20%) - PVC fittings, EPDM gaskets
- Hydrochloric Acid (37%) - PVC fittings, Viton gaskets
- Hydrofluoric Acid (48%) - PP/PVC fittings, Viton gaskets
- Hydrofluosilicic Acid (26%) - PP/PVC fittings, Viton gaskets
- Hydrogen Peroxide (50%) - PVC fittings, Viton gaskets
- Magnesium Chloride (30%) - PVC fittings, EPDM gaskets
- Peracetic Acid (30%) - 316SS fittings, Aflas gaskets
- Phosphoric Acid (85%) - PVC fittings, Viton gaskets
- Polyaluminum Chloride - PVC fittings, EPDM gaskets
- Potassium Carbonate (50%) - PVC fittings, EPDM gaskets
- Potassium Hydroxide (saturated) - PVC fittings, EPDM gaskets
- Propylene Glycol - PP/316SS fittings, EPDM gaskets
- Sodium Bisulfate - PVC/PP fittings, EPDM gaskets
- Sodium Bisulfite - PVC/PP fittings, EPDM gaskets
- Sodium Carbonate (30%) - PVC fittings, EPDM gaskets
- Sodium Hypochlorite (<16.5%) - PVC fittings, Viton gaskets
- Sodium Thiosulfate (40%) - PVC fittings, EPDM gaskets
- Sulfuric Acid (98%) - CPVC fittings, Viton gaskets
- Urea Solution (50%) - PP/PVC fittings, EPDM gaskets
- Zinc Orthophosphate - PP/316SS fittings, EPDM gaskets
- Ozonated Water (up to 10 PPM) - PVC fittings, EPDM gaskets
The common mistake to avoid is mixing gasket and fitting families. Aggressive oxidizers and strong acids on this list - sodium hypochlorite, hydrochloric, phosphoric, hydrofluoric, hydrogen peroxide, and sulfuric acid - call for Viton or CPVC, not the EPDM that works for the salts and glycols; peracetic acid goes a step further and needs Aflas. Pay attention to fitting metal too: DEF and peracetic acid call for 316SS stainless, not PVC, so do not default-order PVC fittings for those services. Pick the wrong elastomer or fitting material and it fails long before the tank does. Cross-check every install against our Chemical Compatibility Database, and for instrumentation see our guide on tank level gauge selection for chemical service and the high-level alarm and cutoff-valve architecture that keeps a double wall tank from overflowing its inner shell.
Sizing, fittings, and freight
Use our Tank Sizing Calculator and Tank Sizing Guide to confirm 120 gallons covers your batch volume plus freeboard before you commit. Factory fitting and outlet configuration for this specific unit is not published in our spec data, so confirm bulkhead size, location, and vent placement on both the inner and outer wall with us before ordering. If double wall containment is part of an SPCC plan, compare configurations with our SPCC 40 CFR 112 double-wall walkthrough, and for larger vertical sizing see the 2,000 gallon vertical tank comparison. This tank ships LTL freight from the Chem-Tainer plant in Marked Tree, Arkansas, quoted live to your ZIP code - get your exact rate from the Freight Cost Estimator or call us at 866-418-1777. We will confirm the resin grade, walk you through fitting and gasket selection for your chemical, and lock in freight before you order.
