The Chem-Tainer 300 Gallon HDPE Vertical Liquid Storage Tank (SKU TC3581IA) is a 300-gallon vertical storage tank molded from natural white polyethylene, standing 85 inches tall on a 35 x 35 inch square footprint. It carries a 1.9 specific gravity rating, which is the number that decides whether this tank is right for your liquid. Filled with water, 300 gallons weighs about 2,502 pounds of contents; at its maximum rated contents weight the tank is engineered to carry 4,754 pounds of liquid. That contents figure is liquid only - the tank's own dry weight is additional and not published in our data, so request it before you size a concrete pad or plan forklift rigging. The 4,754-pound headroom is what lets the same 300 gallon HDPE tank handle denser liquids than plain water without overstressing the wall.
Will it work for your liquid?
Match the specific gravity rating to your contents before you order. A 1.9 SG rating means the tank is built for liquids up to 1.9 times the weight of water per gallon, so 300 gallons of a dense fluid can reach the 4,754-pound rated ceiling without exceeding what the wall was designed to hold; lighter liquids leave margin to spare. The IA build of this Chem-Tainer is already the high-density-rated variant at 1.9 SG, so there is no higher-SG step-up in this line - if your liquid is heavier than 1.9 SG, this is not the right tank. If you are sizing by liquid weight rather than volume, run your numbers through our Tank Sizing Calculator and read the Tank Sizing Guide so you confirm both gallons and pounds.
Specifications
This vertical tank measures 85 inches in height with a 35 x 35 inch base, holds 300 gallons, and is molded in natural white polyethylene so you can gauge liquid level through the wall. It is rated for liquid storage and shares the form factor buyers search for as a 300 gallon vertical storage tank in HDPE. Fitting and outlet configuration is not published in our data for this SKU, so confirm size and placement from the technical drawing on this page or by phone before you order - don't assume a layout. For a deeper look at how wall thickness behaves over the life of a polyethylene tank, the guide on HDPE tank wall thickness at the vapor-saturated headspace explains where premature failures originate and the ASTM D1998 sizing logic behind them. If you are weighing this against other brands at larger volumes, our Snyder vs Norwesco vs Chem-Tainer vertical storage tank comparison walks through how the manufacturers stack up.
The mistake to avoid
The most common error on a tank like this is buying by gallons alone and ignoring the weight your liquid will actually impose. At 300 gallons a dense fluid can drive the load toward the 4,754-pound rated ceiling, so confirm your contents fall within the 1.9 specific gravity rating before you fill it. Reading SG correctly is the single decision that keeps a vertical storage tank in service for its full life rather than overloading the wall.
This tank ships LTL freight, quoted live to your ZIP from the nearest stocking Chem-Tainer plant - origin varies among Marked Tree, AR, Bensenville, IL, Hanford, CA, Hummelstown, PA, and Lake Wales, FL, which is exactly why the ZIP quote matters. Get a freight quote to your ZIP in seconds with our Freight Cost Estimator, or call 866-418-1777 and we will quote it for you and confirm the right tank for your application.
