The Chem-Tainer 125 Gallon 20 Degree Open Top Cone Bottom Tank (SKU TC4224CA) is a polyethylene cone-bottom vessel built for batch mixing, settling, and full-drain chemical service, where solids and residual heel clear the outlet under gravity instead of pooling on a flat floor. It holds 125 gallons and carries a 1.5 specific gravity rating, meaning the resin wall is engineered to safely hold contents up to 1.5 times the density of water. The open-top design gives you room to drop in an agitator, monitor batch level, or fill from above, while the 20-degree cone keeps overall height contained. The listing shows a 42 x 42 inch footprint with a 24-inch height figure; because cone-bottom dimensions and orientation can be recorded inconsistently, confirm the actual height, footprint, and cone depth against the technical drawing on this page before you build a stand or basin around it.
Will it work for your application?
Empty, this tank is easy to position, but plan your stand and anchoring around the loaded weight. Filled with water it carries roughly 1,042 pounds; loaded to its full 1.5 SG rating it reaches about 1,564 pounds. Size your cone stand, saddle, or platform to that 1,564-pound figure, not the water number, and confirm the listed footprint clears your stand legs and any secondary containment wall. As an open top tank with a cone bottom, it suits gravity fill, manual batching, and processes that need top access for an operator sight line or mixer. One gap to close before you order: the fitting and bulkhead configuration is not specified in this listing, so confirm outlet size, port count, and layout with us first. If you are weighing this against a steeper cone, our guide on 30-degree versus 45-degree drainage and residual heel explains how cone angle drives drain rate and how much heel is left behind, and the 125-gallon cone-bottom buyer's guide walks through stand selection at this capacity. To confirm the tank matches your batch volume and headroom, use the Tank Sizing Calculator and the Tank Sizing Guide.
Chemical compatibility
This tank is polyethylene rated to 1.5 specific gravity. The resin is recorded as HDLPE pending confirmation, so verify HDLPE versus XLPE (cross-linked) construction with us before committing it to chemical service, since the two resins differ in chemical resistance. At the 1.5 SG rating, this tank is suitable for the following chemicals at the concentrations shown, with the fitting and gasket materials that pair with each per our chemical-resistance data (always verify at your specific concentration and temperature): Acetic Acid at 60% (PP/PVC fittings, EPDM gaskets), Aluminum Sulfate at 50% (PVC, EPDM), Calcium Chloride at 40% (PVC, EPDM), DEF at 32.5% (316SS fittings, EPDM gaskets), Ferrous Sulfate at 20% (PVC, EPDM), Magnesium Chloride at 30% (PVC, EPDM), Sodium Carbonate at 30% (PVC, EPDM), Urea Solution at 50% (PP/PVC, EPDM), and Ozonated Water up to 10 PPM (PVC, EPDM). Match your fitting and gasket materials to the chemical, not just the tank; using the wrong gasket is one of the most common and avoidable failures in chemical storage. Full data lives in our Chemical Compatibility Database.
The mistake to avoid: the SG rating is a hard limit
The single most common error with a 1.5 SG tank is using it for a denser chemical. Several chemicals buyers store in cone-bottom tanks require a higher 1.9 specific gravity tank, not this one: Ethylene Glycol, Ferric Chloride, Ferric Sulfate, Hydrochloric Acid, Hydrofluoric Acid, Hydrofluosilicic Acid, Hydrogen Peroxide, Peracetic Acid (note the unusual 316SS fitting and Aflas gasket pairing), Phosphoric Acid, Polyaluminum Chloride, Potassium Carbonate, Potassium Hydroxide, Propylene Glycol, Sodium Bisulfate, Sodium Bisulfite, Sodium Hypochlorite (Viton gasket required), Sodium Thiosulfate, Sulfuric Acid (CPVC fittings, Viton gaskets), and Zinc Orthophosphate. If your chemical is on that list, ask us about the 1.9 SG version of this size. While you are planning top access, our fitting placement strategy guide covers vent, fill, level, and drain layout, and our secondary containment volume math guide covers the 110% versus 125% containment rules by jurisdiction.
This tank ships LTL freight from the Chem-Tainer plant in West Babylon, NY, with cost quoted live to your ZIP code. It ships empty, so the 1,042 and 1,564 pound figures above are contents-loaded weights, not the shipping weight. Get your number with the Freight Cost Estimator or call us at 866-418-1777, and our team can confirm resin construction, cone-stand pairing, and fitting layout before you order.
