Technical Foundation
What Is a Carboys and Jerrican?
Carboys and jerricans are both rigid plastic containers for liquid storage and transport, but they differ in typical shape, capacity range and regulatory application. Carboys are generally larger, often cylindrical or with a narrow neck, common in laboratory, water purification and bulk chemical storage settings, and range from a few liters up to 20+ gallons. Jerricans are typically rectangular with a handle, originally standardized for fuel transport, and are the more common form factor when a container needs to be UN-rated for regulated hazardous material shipping under DOT/IMDG/ADR transport rules.
UN rating is a critical distinction: a UN-rated jerrican has been tested and certified (drop test, stacking test, pressure test) to a specific packing group and is marked with a UN certification code documenting what hazard classes and packing groups it's approved to ship — an uncertified container, even if physically similar, cannot legally be used to ship a regulated hazardous liquid. Material (typically HDPE) must also be chemically compatible with the specific liquid stored, since some plastics degrade, become brittle, or allow permeation with certain solvents and chemicals over time even without an obvious immediate reaction.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Container Type | Carboy (cylindrical/narrow-neck) vs. jerrican (rectangular/handled) | Jerricans are the standard form factor for UN-rated hazmat shipping; carboys are common for lab/bulk storage |
| Capacity | 1L to 20+ gallon/liter range | Sized to storage volume needed and any handling/lifting limits for the filled container weight |
| Material | HDPE most common; other plastics for specific chemical compatibility | Must be chemically compatible with the stored liquid to prevent degradation or permeation over time |
| UN Rating | UN certification code with packing group | Required by law for shipping regulated hazardous liquids — uncertified containers cannot be used for hazmat transport |
| Closure Type | Screw cap, spigot/tap fitting, vented cap | Determines dispensing method and whether venting is needed for the specific liquid's vapor characteristics |
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Applications
Where Carboys and Jerricans Get Used
Carboys and jerricans are specified anywhere liquids need rigid, portable containment for storage, dispensing or regulated transport.
Laboratory & Analytical Chemical Storage
HDPE carboys for bulk reagent, solvent and deionized/purified water storage in lab settings.
Hazardous Material Shipping & Logistics
UN-rated jerricans for regulated transport of chemicals, fuels and other hazardous liquids under DOT/IMDG rules.
Water Treatment & Purification Systems
Carboys used for bulk water storage and dosing chemical reservoirs in treatment systems.
Agricultural Chemical Handling
Jerricans for transport and field storage of pesticides, fertilizers and other agricultural chemicals.
Fuel & Lubricant Storage
Jerricans specifically designed and rated for fuel transport and portable storage.
Industrial & Manufacturing Facilities
Bulk chemical carboys and jerricans for process chemical supply and waste liquid collection.
FAQ
Carboys and Jerricans Questions, Answered
What does a UN rating on a jerrican actually certify?
A UN rating certifies that the specific container design has passed a battery of tests — drop test, stacking test, hydraulic pressure test, and others — for a defined packing group (I, II or III, representing decreasing hazard severity) and hazard class, and the container is marked with a UN code documenting exactly what it's certified for. Only UN-rated containers can legally be used to ship regulated hazardous materials under DOT, IMDG or ADR transport regulations — a similar-looking uncertified container cannot be substituted.
Can I use a standard (non-UN-rated) carboy or jerrican for any liquid?
For non-regulated liquids (like general water storage or non-hazardous process fluids) a standard container is fine, but if the liquid is classified as hazardous for transport (flammable, corrosive, toxic, etc.) and it's being shipped rather than just stored on-site, a UN-rated container is legally required. Even for on-site storage, some chemicals may still require specific container ratings under other safety regulations, separate from transport rules.
How do I know if HDPE is chemically compatible with my liquid?
Chemical compatibility charts published by container manufacturers rate HDPE's resistance to a wide range of chemicals, but some solvents and aggressive chemicals can cause HDPE to swell, become brittle, or allow slow permeation of vapors through the container wall over extended storage — always check compatibility for your specific chemical rather than assuming HDPE is universally suitable, especially for long-term storage.
What's the difference between a carboy and a jerrican beyond shape?
Beyond the typical shape difference (cylindrical/narrow-neck carboy vs. rectangular/handled jerrican), jerricans are the standard form factor manufactured and tested for UN hazmat certification and stacking in shipping configurations, while carboys are more commonly used for lab and bulk storage applications where UN transport certification usually isn't a factor. The right choice depends on whether the container needs to be shipped as regulated hazmat or simply used for storage and dispensing.
How should carboys and jerricans be stored to maintain container integrity?
Keep containers away from direct UV/sunlight exposure where possible, since prolonged UV exposure can degrade and embrittle plastic over time; store within the container's rated temperature range, since some chemicals and plastics interact differently at elevated temperature; and periodically inspect for stress cracking, discoloration or softening, particularly for containers holding aggressive chemicals over extended periods.
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