Understanding IBC Tote Markings and Labels: What Every Code Means

Every certified IBC tote carries a series of markings that encode critical information about its construction, capabilities, and history. These markings are not decorative -- they serve as the container's identity card and compliance documentation. Being able to read and interpret them is an essential skill for anyone who handles, purchases, or specifies IBC totes. This guide breaks down each element of the marking system.

The UN Marking System

The United Nations has established a standardized marking system for all packaging used in the transport of dangerous goods, including IBC totes. These markings are required for any IBC tote that will be used to ship regulated materials, and they are also applied to most non-regulated containers as a quality indicator.

A typical UN marking on an IBC tote looks something like this: UN 31HA1/Y/0824/USA/SCHUTZ-01/10500/1575

Let us decode each element.

Container Type Code

The first element after "UN" is the container type code. For IBC totes, this typically begins with "31" which indicates a rigid IBC for liquids. The full type code structure is as follows.

The first digit indicates the container category. "3" means it is a rigid IBC. "1" indicates it is designed for liquids (as opposed to "2" for solids).

The letter(s) that follow indicate the construction material. "H" stands for plastics, and "HA" specifically means a composite IBC with a rigid plastic inner container and an outer steel cage. Other codes include "HB" (rigid plastic inner with outer aluminum), "A" (steel), and "B" (aluminum).

The final digit indicates the container sub-type. "1" means it has a bottom discharge, while "2" means it does not have a bottom discharge.

So "31HA1" tells you this is a rigid IBC for liquids, with a composite construction (plastic inner, steel outer), and a bottom discharge valve.

Performance Level

The letter immediately after the type code indicates the performance level, which relates to the maximum specific gravity (density) of materials the container can safely hold.

"X" is the highest rating, suitable for Packing Groups I, II, and III. This means the container can hold materials with the highest danger levels.

"Y" is rated for Packing Groups II and III, covering materials of medium and low danger levels.

"Z" is rated for Packing Group III only, the lowest danger level.

For most commercial applications, Y-rated containers are sufficient. X-rated containers command a premium and are specified primarily for highly hazardous materials.

Date of Manufacture

The four-digit date code indicates when the container was manufactured. The format is MMYY, so "0824" means August 2024. This date is critical for determining the container's age and remaining service life.

UN regulations specify that composite IBC totes have a maximum service life of five years from the date of manufacture. After five years, the container cannot be used for regulated dangerous goods transport unless it has been inspected and recertified. This five-year rule applies to the HDPE bottle; the steel cage can be reused with a new bottle through the reconditioning process.

Country of Manufacture

The country code (such as "USA") indicates where the container was produced. This can be useful for tracing the container's origin and for verifying compliance with specific national regulations.

Manufacturer and Model

The manufacturer's name or registered code, followed by a model number, identifies the specific producer and design. This information allows you to look up detailed specifications and contact the manufacturer if needed.

Weight Information

The final numbers typically indicate the maximum gross weight (the weight of the full container, including the contents and the tote itself) and the tare weight (the weight of the empty container). In our example, "10500" means the maximum gross weight is 10,500 Newtons (approximately 2,360 pounds), and "1575" is the tare weight in Newtons (approximately 354 pounds).

Additional Markings

Beyond the UN code, IBC totes may carry several other markings.

The stacking test symbol indicates the container has passed stacking tests. It is often accompanied by a number showing the maximum stacking load in kilograms.

A crossed-out flame symbol means the container's HDPE includes an anti-static additive, making it suitable for use with flammable liquids. Standard HDPE can accumulate static charge, which poses an ignition risk with flammable contents.

Recycling symbols on the bottle indicate the plastic type (HDPE is typically marked with the "2" recycling code).

Food contact symbols (a glass and fork icon, common in European markets) indicate the container meets food-grade standards and can be used for materials intended for human consumption.

Date Codes and Age Assessment

Reading the date code correctly is particularly important when purchasing used IBC totes. The date tells you not just when the container was made, but provides a reliable indicator of the remaining useful life of the HDPE bottle.

HDPE degrades over time due to UV exposure, thermal cycling, and chemical exposure. A general guideline is that an HDPE bottle used indoors for compatible materials has a practical lifespan of 5 to 7 years. Bottles stored outdoors or used with aggressive chemicals may have shorter effective lifespans.

When purchasing used totes, always check the date code and factor the container's age into your value assessment. A two-year-old Grade B tote may be a better investment than a four-year-old Grade A tote, depending on your intended use and duration of service.

Reconditioning Markings

Reconditioned IBC totes carry additional markings that indicate the reconditioning date, the reconditioner's identity, and the nature of the reconditioning performed. These markings are typically applied near the original UN marking and are preceded by an "R" or "RL" designation.

"R" indicates the container was reconditioned (cleaned, inspected, and repaired as needed with original components).

"RL" indicates the container was remanufactured, meaning the HDPE bottle was replaced with a new one while retaining the original cage and pallet.

The reconditioning date is particularly important because it effectively resets the five-year service life clock for dangerous goods transport. An IBC with a cage manufactured in 2020 but rebottled in 2025 has a service life extending to 2030 for the new bottle.

Practical Tips for Reading Markings

The markings are typically located on the metal plate attached to the cage frame, on the bottle itself (molded or printed), and on any labels affixed to the container.

Over time, markings can become faded or obscured. If you cannot read the markings on a used IBC tote, treat it as an unverified container and do not use it for regulated materials. Reputable sellers will ensure all markings are legible and will provide documentation of the container's history.

Understanding these markings transforms you from a passive buyer into an informed evaluator. You can assess age, verify capabilities, confirm compliance, and make purchasing decisions with confidence.