The Chem-Tainer 7 Gallon Open Top Batch Storage Tank (SKU R081812A) is a small rectangular polyethylene tank built for hand-batched mixing, dosing, and short-term storage on a benchtop or inside a tight equipment skid. It holds 7 gallons in a natural white polyethylene shell, measures 18 inches long by 8 inches wide by 14 inches tall, and sits on an 8.0 x 18.0 inch footprint. The narrow 8-inch width is the real differentiator here: this rectangular open top tank slides into a shelf or skid gap where a round drum of the same volume simply will not fit, and it sits flat against a wall or inside a frame. The open top gives you full-hand access for filling, stirring, and cleanout.
Will it work for your batch?
The standout spec on this shell is its specific gravity rating of 2.0. Most small open-top vessels are built around a 1.5-SG envelope; at 2.0, this tank's maximum rated contents weight is roughly 117 pounds, so the same wall that carries about 58 pounds of plain water also handles dense slurries and heavy mixed liquids that would overstress a lighter open-top of the same size. If you are batching anything denser than water, that structural headroom is the reason to pick this tank. It also ships as a plain open-top vessel with no pre-installed fittings, bulkhead ports, or gasketed outlets - you fill, dose, and empty over the top or through a customer-added pump, so plan your transfer method around that. If you are deciding between sizes or staging several of these for a multi-stage batch line, run your fill volume through the Tank Sizing Calculator or read the Tank Sizing Guide first.
Handling and the mistake to avoid
Plan your lift around the load, not the empty shell. One person moves it empty with ease; filled with water it is about 58 pounds, which is two-hand carry or transfer-pump territory; at a full 2.0-SG load it reaches roughly 117 pounds - do not lift it loaded, drain or pump it down first. The bigger mistake is reading the 2.0 SG rating as a chemical clearance. That number tells you what the wall can structurally hold, not what the polyethylene will chemically resist - resin compatibility is a separate question, so confirm your specific liquid against the resin before committing it to long-term service. Remember this is an open top vessel: it offers no sealed containment, no vapor control, and no spill protection if bumped, so treat exposed installs as a batch-and-transfer station rather than permanent bulk storage, and keep the tank out of sustained direct sunlight to protect the natural white wall. Check the technical drawing on this page for exact dimensional tolerances before you cut any bracket or shelf to fit.
Freight
This tank ships LTL from the Chem-Tainer plant in West Babylon, NY, with freight quoted live to your ZIP code. Set your expectations honestly on a small, light tank like this: at roughly 58 pounds it still moves as LTL freight, and that cost can be a meaningful share of the total, especially the farther you are from the Northeast - so quote your ZIP before you decide. Get an exact number in seconds with the Freight Cost Estimator, or call us at 866-418-1777 and we will quote it by phone. Whether you are searching for an open top tank, a rectangular open top tank, or simply an open tank that fits a tight bench, this 7-gallon shell is one of the smallest hard-walled options in the open top line. Questions on fit or freight? Reach the team at 866-418-1777.
