The Chem-Tainer 65 Gallon Vertical Double Wall Liquid Chemical Storage Tank (SKU TC2837DC) is a self-contained primary-plus-secondary containment vessel for chemical service where a spill cannot be allowed to reach the floor. The inner tank holds 65 gallons; the integral outer wall provides the secondary containment that SPCC and similar site rules call for, without a separate berm. It is molded in natural white polyethylene, stands 37 in tall on a 28 x 28 in footprint, and carries a 1.9 specific gravity rating, meaning the inner tank is engineered to hold liquids up to 1.9 times the weight of water. That 1.9 SG rating is the top of the standard Chem-Tainer ladder and the maximum offered in this size and configuration, so if you are storing something dense you are already at the ceiling, not one tier below it. The SG number is the single most important spec on this tank, and ignoring it is the most common mistake buyers make with a double wall chemical tank.
Will this tank work for your chemical?
Empty, this is a one-person-to-place footprint, but plan for the loaded weight. Filled with plain water the inner tank carries about 542 lb; at the full 1.9 SG rating the rated contents weight reaches roughly 1,030 lb. Size your pad, anchoring, and any platform to the loaded number, not the empty shell. This matters most for the densest chemicals on the compatibility list: at 65 gal of 98% sulfuric acid or 50% ferric chloride the inner tank is working near its rated structural limit, which is exactly why the pad and anchoring get sized to ~1,030 lb rather than the 542 lb water figure. The 28 x 28 in footprint and 37 in height fit through most standard doorways and under low ceilings, which is part of why this size moves under the search terms buyers use for a vertical storage tank, a 65 gallon double wall tank, and indoor chemical day-tank duty. To match volume and SG to your application, use the Tank Sizing Calculator and the Tank Sizing Guide, and confirm port locations against the technical drawing on this page before you specify fittings and plumbing.
Fittings are specified separately
This tank ships without bulkhead fittings, vents, or gaskets pre-installed, so those are specified and ordered separately and must match the per-chemical material callouts in the table below. That is where the real ordering mistake happens: a fitting or gasket that suits one chemical will fail on another. For example, sulfuric acid pairs with CPVC fittings and Viton gaskets, while peracetic acid needs 316SS fittings and Aflas gaskets. Pick the chemical first, then let the table drive the fitting and gasket material.
Chemical compatibility
This tank is molded in polyethylene with a 1.9 specific gravity rating. The resin family on our record ends in a question mark, so before you put any chemical in it, confirm with us whether your unit is HDLPE or XLPE (cross-linked). This is decisive for the strong oxidizers on the list below, hydrogen peroxide 50%, sodium hypochlorite, and peracetic acid: HDLPE and XLPE do not share identical oxidizer resistance, and guessing the resin family is how those services fail. Confirm the resin before you fill. Always verify the exact chemical, concentration, and temperature against the OEM chemical-resistance chart, which is concentration- and temperature-specific. The following chemicals are listed compatible with this tank at the noted concentrations, with the fitting and gasket materials that pair with each:
- 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 - not yet in our online database; call 866-418-1777 for the chart
Gasket material is not interchangeable: where the chart specifies Viton (for example sulfuric, phosphoric, and hydrogen peroxide) or Aflas (peracetic acid), an EPDM gasket will fail. Match the fitting and gasket material exactly. Full details for each chemical, and any not listed here, live in our Chemical Compatibility Database.
Freight and ordering
This double wall tank ships LTL freight from the Chem-Tainer plant in Marked Tree, Arkansas, quoted live to your ZIP. Get your number on the Freight Cost Estimator or call us at 866-418-1777. For broader guidance on outfitting a double wall chemical tank for spill and overfill protection, see our writeups on tank level gauge selection for chemical service, high-level alarm and spillover redundancy architecture, and the SPCC 40 CFR 112 compliance walkthrough for double-wall containment.
