The Chem-Tainer 75 Gallon 30 Degree Cone Bottom Tank (SKU TC3024CB) is an open-top, cone-bottom polyethylene tank built for batching, dosing, and full-drain chemical service where you need the contents to evacuate completely instead of leaving a heel in the bottom. It stands 24 inches tall on a 38 x 38 inch footprint, holds a rated 75 gallons, and carries a 2.0 specific gravity rating, meaning the wall is engineered for liquids up to roughly twice the density of water. Filled with water the contents weigh about 626 lbs; at the full 2.0 SG rating they can reach 1,251 lbs, so plan your stand, floor, and containment around the loaded number, not the water figure. As an open-top cone bottom with no stand included, this tank needs a supporting cone-bottom stand or structure to hold the cone off the ground so the drain can function. Common applications in the data run from acid and oxidizer storage to lower-corrosivity dosing of DEF, urea solution, and ozonated water.
Does it work for your job?
This is a 30-degree cone, which drains more gradually than a 45-degree cone but takes less vertical height, a trade-off worth understanding before you buy. If you are weighing cone angles, the 30 vs 45 drainage-rate comparison and the cone-bottom buyer's guide lay out residual heel and solids-handling behavior by angle. This open top cone bottom tank ships with no pre-installed bulkhead fittings: the fill, vent, and drain penetrations must be ordered and matched to your chemical per the materials listed below. For where to place those penetrations so vent, fill, and drain do not conflict, see the fitting placement strategy guide. If you are still sizing the system, run your daily volume through the Tank Sizing Calculator and the Tank Sizing Guide before committing to 75 gallons. Refer to the technical drawing on this page for exact dimensions and the cone geometry.
Chemical compatibility
This is a polyethylene tank with a 2.0 specific gravity rating. The resin is listed as HDLPE but shown with a question mark in our data, so before you put any chemical in it, confirm whether this specific tank is HDLPE (high-density linear) or XLPE (cross-linked), as that distinction governs which chemicals it will safely hold over time. Always check the OEM chemical-resistance chart for your exact concentration and operating temperature; compatibility is concentration- and temperature-specific, not a blanket yes or no. For reference, 2.0 SG is the top wall rating offered in this size and family, with no higher-density variant available, so if your contents exceed 2.0 SG (twice water density) this tank is not the right choice.
Based on the compatibility data for this tank, the following chemicals are supported at the listed concentrations, with the recommended fitting and gasket materials:
- 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
Notice that the aggressive oxidizers and strong acids - sodium hypochlorite, hydrogen peroxide, hydrochloric, phosphoric, and sulfuric acid - call for Viton gaskets rather than EPDM, and sulfuric acid at 98% needs CPVC rather than PVC fittings. Peracetic acid is the lone outlier, requiring Aflas gaskets and 316SS fittings, not a Viton kit. Matching the fitting and gasket material to the chemical is the single most common mistake on a chemical tank; getting it wrong leads to seal failure and leaks. Browse the full Chemical Compatibility Database to confirm your chemical at your concentration and temperature.
The mistake to avoid
The most common error on a 2.0 SG cone-bottom tank is sizing the stand and freight around water weight. At full rated density the contents reach 1,251 lbs, not the 626 lbs water alone would weigh, so your cone-bottom stand and floor must carry that loaded figure with margin. Because this is an open-top chemical vessel with no integral containment, spec a secondary containment basin rated for the full 75 gallons at rated density. The second error is treating the resin question as settled: confirm HDLPE versus XLPE for your chemical before filling, and match fitting and gasket materials per the compatibility list above.
This open top cone bottom tank ships LTL freight from Chem-Tainer's West Babylon, NY plant, quoted live to your ZIP code. Get an exact number with our Freight Cost Estimator, or call 866-418-1777 to talk through cone angle, fitting layout, and the right stand for your install before you order.
