The Chem-Tainer 750 Gallon 15 Degree Plastic Vertical Cone Bottom Tank (SKU TC6258CA) is an open-top, cone-bottom polyethylene tank built for full-drain chemical and process service where a flat-bottom vessel would trap a residual heel. It holds 750 gallons, stands 69 inches tall on a 64 x 64 inch footprint, and carries a 2.0 specific gravity rating - twice the density of water, which is what lets it hold the full-strength acids in the compatibility list below. The 15-degree cone slopes toward the center outlet for batching, dosing, and solids-bearing fluids that need to keep moving toward the drain.
What "open top, cone bottom" means for your install
The open top gives you easy access from above for manual charging, mixing, and visual level checks - the reason this tank shows up under searches like open top tank, cone bottom tank, and open tank. It is not a sealed vessel, though: there is no pressure or vapor containment, so for outdoor or contamination-sensitive service you will want a separate cover. This is a cone-bottom tank with NO stand, so plan your support before it arrives - the cone has to be elevated in a steel or poly stand so the bottom outlet clears the floor and you can plumb the drain. The tank's footprint is 64 x 64 inches, but your stand footprint and floor loading are what carry the weight, so size those to the loaded number.
Will it carry your fluid's weight?
The 2.0 SG rating means the wall is engineered to carry contents up to twice the density of water. Filled with water, the tank weighs about 6,255 lb; at the maximum rated contents - full volume at full SG margin, a worst case - the structure is built to carry roughly 12,510 lb. Size your stand, pad, and anchoring to that loaded figure, not the empty shell. The tank ships with no fittings specified, so outlet, bulkhead, and valve selection is a separate spec you confirm against your fluid. Use the Tank Sizing Calculator and Tank Sizing Guide to match the cone geometry and weight to your space and density.
Chemical compatibility
This tank is molded polyethylene with a 2.0 specific gravity rating. The resin is recorded as HDLPE? in our data, so confirm whether your tank ships as HDLPE (high-density linear) or XLPE (cross-linked) with us at 866-418-1777 before committing it to chemical service - the two resins behave differently with oxidizers and solvents. The compatibility below is drawn from the OEM chemical-resistance chart and is concentration- and temperature-specific; verify your exact concentration and operating temperature before ordering, and match fittings and gaskets to the chemical, not to the tank.
Documented compatible chemicals for this polyethylene tank include acetic acid (60%, PP/PVC fittings, EPDM gaskets), aluminum sulfate (50%, PVC/EPDM), calcium chloride (40%, PVC/EPDM), DEF (32.5%, 316SS fittings, EPDM), ethylene glycol (100%, PVC/EPDM), ferric chloride (50%, PVC/EPDM), ferric sulfate (60%, PVC/EPDM), ferrous sulfate (20%, PVC/EPDM), hydrochloric acid (37%, PVC fittings, Viton gaskets), hydrofluoric acid (48%, PP/PVC, Viton), hydrofluosilicic acid (26%, PP/PVC, Viton), hydrogen peroxide (50%, PVC, Viton), magnesium chloride (30%, PVC/EPDM), peracetic acid (30%, 316SS fittings, Aflas gaskets), phosphoric acid (85%, PVC, Viton), polyaluminum chloride (PVC/EPDM), potassium carbonate (50%, PVC/EPDM), potassium hydroxide (saturated, PVC/EPDM), propylene glycol (PP/316SS, EPDM), sodium bisulfate (PVC/PP, EPDM), sodium bisulfite (PVC/PP, EPDM), sodium carbonate (30%, PVC/EPDM), sodium hypochlorite (under 16.5%, PVC fittings, Viton gaskets), sodium thiosulfate (40%, PVC/EPDM), sulfuric acid (98%, CPVC fittings, Viton gaskets), urea solution (50%, PP/PVC, EPDM), zinc orthophosphate (PP/316SS, EPDM), and ozonated water (up to 10 PPM, PVC/EPDM). Notice the pattern: aggressive oxidizers like sodium hypochlorite, hydrogen peroxide, sulfuric acid, and peracetic acid call for Viton or Aflas gaskets rather than EPDM, and DEF, peracetic acid, and zinc orthophosphate want 316 stainless wetted parts. Cross-check your exact service on our Chemical Compatibility Database and the OEM chart before specifying valves and gaskets.
The mistake to avoid
The most common error on a tank like this is matching fittings and gaskets to the tank instead of to the chemical. The polyethylene shell tolerates a wide range of fluids, but an EPDM gasket on a hypochlorite or peroxide line will fail long before the tank does. Confirm the resin (HDLPE vs XLPE), verify your concentration and temperature against the OEM chart, and spec the gasket and valve material the chart calls for. Because this is a cone-bottom unit with no stand, confirm your support structure before delivery rather than after. See the technical drawing on this page for outlet location and dimensional detail.
This tank ships LTL freight from the nearest of our plants in Hanford, CA or West Babylon, NY, quoted live to your ZIP. Get an exact rate with our Freight Cost Estimator, or call 866-418-1777 to confirm resin, fitting selection, and freight before you order. Because cone angle drives drainage rate and residual heel, our comparison of 30 vs 45 degree cone-bottom drainage is worth reading to understand how the cone angle affects how cleanly this tank empties.
