Chemical drums come in four common sizes: 5, 15, 30, and 55 gallons, with the 55-gallon (208-liter) drum as the industry standard. A standard 55-gallon steel drum measures about 22.5 inches in diameter by 33.5 inches tall inside, comes in tight-head or open-head styles, and carries a UN code such as 1A1 (steel) or 1H1 (plastic) that certifies it for hazardous materials under 49 CFR 178.504.
What are the standard chemical drum sizes?
| Nominal size | Metric volume | Typical use |
|---|---|---|
| 5-gallon pail | ~19 L | Samples, small-volume users, lab supply |
| 15-gallon drum | ~57 L | Specialty chemicals, higher-value solvents |
| 30-gallon drum | ~114 L | Mid-volume production, limited floor space |
| 55-gallon drum | ~208 L | Industry standard for bulk liquids and solids |
Above 55 gallons you move into 275- or 330-gallon IBC totes and bulk tanker delivery — see our guide to choosing between drums, IBC totes, and bulk for the economics of each step up.
What are the dimensions of a 55-gallon drum?
A standard 55-gallon steel drum measures approximately 22.5 inches in inside diameter and 33.5 inches in inside height; outside dimensions run about 23 inches in diameter and 35 inches tall including the chimes. Empty (tare) weight for a steel drum is roughly 40–55 pounds depending on gauge. Always confirm exact specs with the drum manufacturer’s data sheet — dimensions vary slightly by maker and gauge.
What is the difference between a tight-head and an open-head drum?
A tight-head (closed-head) drum has a fixed top with threaded bung openings — typically one 2-inch and one 3/4-inch — and is the default for liquids like solvents. An open-head drum has a fully removable lid secured by a bolt or lever-lock ring and is used for solids, powders, and viscous products. The regulatory line between the two is specific: under 49 CFR 178.504, openings in a non-removable-head steel drum (1A1) may not exceed 7.0 cm (3 inches) in diameter; anything larger makes it a removable-head (1A2) drum. The same rule sets construction requirements — for example, body seams must be welded on steel drums designed to hold more than 40 L (11 gallons) of liquid.
What do UN drum codes like 1A1 and 1H1 mean?
The UN code stamped on a drum identifies its construction under 49 CFR 178.502: the first digit 1 means drum, the letter gives the material, and the last digit gives the head type.
| UN code | Material | Head type |
|---|---|---|
| 1A1 | Steel | Non-removable (tight) head |
| 1A2 | Steel | Removable (open) head |
| 1H1 | Plastic (HDPE) | Non-removable (tight) head |
| 1H2 | Plastic (HDPE) | Removable (open) head |
| 1G | Fiber | — |
For regulated materials, the drum must carry a full UN performance marking, and the hazard communication on the outside must match the contents — our guide to reading a GHS label on a chemical drum and DOT hazmat classes for solvents cover what those markings mean.
How much does a full 55-gallon drum weigh?
Net weight equals the liquid’s density times 55 gallons, plus 40–55 pounds of steel. Water weighs 8.34 pounds per gallon, so a 55-gallon drum of water holds about 459 pounds of product — roughly 500 pounds gross. Most solvents are lighter: see our worked examples for how much a gallon of acetone weighs and how much a gallon of toluene weighs. Plan material handling around 400–550 pounds gross per drum for common chemicals.
Should you choose steel or poly drums for your chemical?
It depends on chemical compatibility. Carbon steel (often with an epoxy-phenolic lining) is standard for solvents and most organics; HDPE poly drums are the default for acids, caustics, and other corrosives that attack steel. Your supplier’s SDS and packaging spec govern — the wrong drum material is a compliance failure, not just a quality problem.
What drum sizes does RightPath stock?
RightPath Industries ships bulk solvents and specialty chemicals like acetone in 5-gallon pails, 15- and 30-gallon drums, 55-gallon steel and poly drums, IBC totes, and full tanker loads. If your process needs a non-standard fill, ask about repackaging options when you request a quote. Chemical-specific packaging examples are in our methanol packaging sizes guide.
How do you order drummed chemicals from RightPath?
Tell us the chemical, grade, container size, and delivery location. We quote a landed cost including freight and hazmat handling, and as a stocking distributor we can turn drum orders around fast. Request bulk pricing and our team will respond same business day.
Frequently asked questions
How many liters are in a 55-gallon drum?
A 55-gallon drum holds approximately 208 liters. Actual fill volume is often slightly less to leave headspace for thermal expansion.
How many 55-gallon drums fit on a pallet?
Four drums fit on a standard 48 x 40 inch pallet, which is how drummed chemicals typically ship on LTL and truckload freight.
Are all 55-gallon drums exactly the same size?
No. 55 gallons is a nominal capacity; exact diameter, height, and tare weight vary by manufacturer, material, and steel gauge. Check the manufacturer’s spec sheet when clearances are tight.
What does the 1A1 marking on a drum mean?
1A1 identifies a tight-head (non-removable head) steel drum under the UN packaging identification codes in 49 CFR 178.502. 1A2 is the open-head steel version; 1H1 and 1H2 are the plastic equivalents.