OSHA safety can requirements are set primarily by 29 CFR 1910.106, with additional rules on color marking under 1910.144 and hazard labeling under 1910.1200. A compliant safety can is a container of 5 gallons or less, certified by a Nationally Recognized Testing Laboratory, fitted with a spring-closing lid and spout cover, and built to safely relieve internal pressure if exposed to fire.1Occupational Safety and Health Administration. 29 CFR 1910.106 – Flammable Liquids Getting the container right is only part of the job: how you mark it, how much you store, and how you pour from it all carry their own rules, and inspectors check them together.
What Counts as a Safety Can
The federal definition at 29 CFR 1910.106(a)(29) is narrow. Every element does work:
- A capacity of 5 gallons or less. Anything larger is not a safety can under federal law, no matter how it’s built.
- A spring-closing lid that snaps shut on its own, so vapors can’t drift out when the can is set down.
- A spout cover that also closes automatically, giving a second barrier against vapor release.
- A design that safely relieves internal pressure when the can is exposed to fire, rather than rupturing.
Most certified cans also carry an internal flame arrester screen at the spout — a fine mesh that keeps an external flame from traveling into the liquid. The regulation doesn’t call the arrester out separately, but it appears on virtually every can that passes lab testing. Treat a can with a missing or damaged screen as unusable.
Testing Laboratory Certification
The word “approved” in the safety can definition has a specific meaning. Under 29 CFR 1910.106(a)(35), an approved container is one listed or certified by a Nationally Recognized Testing Laboratory as defined in 29 CFR 1910.7.2eCFR. 29 CFR 1910.106 – Flammable Liquids The marks you’ll see most often are Underwriters Laboratories (UL) and FM Global, embossed or printed near the spout or on the body. If the marking has worn off or the can is old enough that you can’t read it, replace it. Uncertified containers are one of the first things an inspector looks for.
Type I and Type II
Certified safety cans come in two configurations. A Type I can has a single opening for both filling and pouring, which works when you’re dispensing into something with a wide mouth but gets clumsy with narrow inlets. A Type II can has a separate fill port and a flexible metal dispensing hose, usually 5/8-inch or 1-inch diameter, with a trigger for flow control. If workers regularly pour into equipment with small fuel openings, Type II is the safer choice.
Polyethylene Cans
Metal isn’t the only permitted material. OSHA hasn’t written plastic containers into 29 CFR 1910.106 directly, but the agency has clarified through formal interpretations that polyethylene safety cans are acceptable under a de minimis policy when they meet applicable industry consensus standards such as NFPA 30.3Occupational Safety and Health Administration. Flammable and Combustible Liquids (Standard Interpretation) The 5-gallon ceiling and the spring-closing, pressure-relief features still apply, and the can still needs testing-laboratory certification. The practical wrinkle with plastic is static electricity, addressed further down.
Color and Labeling Rules
OSHA’s color rule at 29 CFR 1910.144(a)(1)(ii) requires that any portable container holding a flammable liquid with a flashpoint at or below 80°F be painted red, with either a yellow band around the body or the contents name stenciled in yellow.4eCFR. 29 CFR 1910.144 – Safety Color Code for Marking Physical Hazards The yellow cans commonly used for diesel and the blue ones used for kerosene reflect industry convention rather than federal mandate, because those fuels have flashpoints above 80°F. Consistent color coding across a facility still helps prevent fuel mix-ups.
Separately, the Hazard Communication Standard at 29 CFR 1910.1200 requires that workplace containers of hazardous chemicals carry labeling identifying the product and its hazards.5Occupational Safety and Health Administration. 29 CFR 1910.1200 – Hazard Communication Shipped containers need full GHS labels with pictograms, signal words, and hazard and precautionary statements. Workplace containers can carry either the full GHS label or a simplified version with product name and general hazard information.
There’s one narrow exception. If a worker transfers a flammable liquid from a labeled container into a portable safety can for immediate personal use, the safety can itself doesn’t need its own label.5Occupational Safety and Health Administration. 29 CFR 1910.1200 – Hazard Communication The moment the can is set aside for someone else to use later, the exemption falls away and labeling is required.
How Much You Can Store, and Where
A single safety can maxes out at 5 gallons. The bigger compliance question is how many cans, and how much total liquid, you can keep in a given area outside an approved cabinet or storage room. Under 29 CFR 1910.106(e)(2)(ii)(b) for general industry:6eCFR. 29 CFR 1910.106 – Flammable Liquids
- Category 1 liquids: no more than 25 gallons in containers.
- Category 2, 3, or 4 liquids: no more than 120 gallons in containers.
The categories run by flashpoint and boiling point. Category 1 covers flashpoints below 73.4°F with boiling points at or below 95°F. Category 2 shares the low flashpoint but has a higher boiling point. Category 3 covers flashpoints from 73.4°F to 140°F, and Category 4 runs from 140°F up to 199.4°F. Gasoline falls into Category 1 or 2 depending on blend, which is why it draws the tightest limit.
Construction sites work under a stricter version. Under 29 CFR 1926.152, all flammable liquids are capped at 25 gallons outside a cabinet regardless of category.7Occupational Safety and Health Administration. 29 CFR 1926.152 – Flammable Liquids
Anything above the open-storage thresholds has to go into an approved storage cabinet or a dedicated inside storage room. Each cabinet can hold up to 60 gallons of Category 1, 2, or 3 liquids, or up to 120 gallons of Category 4, and every cabinet must be labeled “Flammable — Keep Fire Away” in conspicuous lettering.6eCFR. 29 CFR 1910.106 – Flammable Liquids The cabinet itself must meet the construction and fire-test specifications in 29 CFR 1910.106; a cabinet that looks the part but hasn’t been tested and certified is a common inspection failure.
Bonding and Grounding When You Pour
This is where most safety-can fires actually start. Flowing liquid generates static electricity, and if the charge can’t dissipate, it arcs and ignites the vapors at the pour point.
Under 29 CFR 1910.106(e)(6)(ii), when you’re dispensing Category 1 or 2 liquids, or Category 3 liquids with a flashpoint below 100°F, the nozzle and the receiving container must be electrically interconnected.6eCFR. 29 CFR 1910.106 – Flammable Liquids In practice, that means either bonding the two containers with a wire so they share the same electrical potential, or setting the receiving container on a grounded metal plate connected to the fill stem.
Metal cans make this easy because they conduct. Polyethylene is trickier. OSHA has addressed the plastic-container question through standard interpretations that reference NFPA 77, which generally permits filling non-conductive containers of 5 gallons or less without special precautions but calls for additional grounding techniques with larger plastic containers.8Occupational Safety and Health Administration. Bonding and Grounding of Plastic Containers During Transfer of Class I Flammable Liquids
When to Retire a Can
A safety can is not a permanent piece of equipment. Springs wear out, arrester screens corrode, and paint fades until the color coding stops communicating anything. OSHA doesn’t prescribe an inspection schedule, but using a can that no longer meets the regulatory definition is a violation in waiting.
Replace the can or the arrester screen if the lid doesn’t snap shut firmly, the spout cover sticks open, the screen shows visible corrosion or distortion, or residue clogs more than roughly a third of the mesh openings even after cleaning. A can that has been directly exposed to a fire should be retired immediately, because the heat may have compromised the pressure-relief function even when the can looks intact.
What Violations Cost
OSHA adjusts its civil penalties every January for inflation. As of the January 15, 2025 adjustment, a serious violation carries a maximum fine of $16,550 per occurrence, and the same ceiling applies to other-than-serious and posting-requirement citations.9Occupational Safety and Health Administration. OSHA Penalties Willful or repeated violations can reach $165,514 per occurrence, and failure to correct a cited condition adds $16,550 per day beyond the abatement deadline.10Occupational Safety and Health Administration. US Department of Labor Announces Adjusted OSHA Civil Penalty Amounts for 2025
Safety can citations rarely arrive alone. An inspector who spots an uncertified container will also look at storage quantities, cabinet construction, labeling, and bonding practice, and a single walk-through can produce citations across several standards at once. Certified cans and correct handling cost a fraction of a single serious violation.